Configuring multipath for root device

Configuring multipath for root device

[Pradipmaya Maharana]

Hi All,

Is there a process/document that talks about how to configure
root/boot device for multipath?

Thanks and Regards,
Pradipmaya.

Re: Configuring multipath for root device

[Chandra Seetharaman]

[-- Attachment #1: Type: text/plain, Size: 779 bytes --]

I am working on a multipath usage document. Attached is the installation
section of that document.

Note that it is written for RHEL5 U1 and SLES10 SP1.

Good Luck,

chandra

On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> Hi All,
> 
> Is there a process/document that talks about how to configure
> root/boot device for multipath?
> 
> Thanks and Regards,
> Pradipmaya.
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------


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[-- Type: text/plain, Size: 2970 bytes --]

4.1. Installation instructions for SLES10

Note: This is tested on SLES10 SP1. If you have any other version, your
mileage may vary.

   1. Install the OS in a device that has multiple paths. Make sure the
root device's "Mount by" option is set to "Device by-id" (this option is
available under "expert partitioner" as "fstab options").
   2. Complete the installation. Let the system boot up in multiuser mode.
Make sure the root device, swap device are all referenced by their by-id
device node entries instead of /dev/sd* type names. If they are not, fix
them first.
   3. Once booted, update /etc/multipath.conf If you have to make changes
to /etc/multipath.conf, make the changes.
      Note: the option "user_friendly_names" is not supported by initrd.
So, if you have user_friendly_names in your /etc/multipath.conf file,
comment it for now, you can uncomment it later.
   4. Enable multipathing by running the following commands
          * chkconfig boot.multipath on

          * chkconfig multipathd on 
   5. Add multipath module to initrd

      Edit the file /etc/sysconfig/kernel and add "dm-multipath" to
INITRD_MODULES". Note: If your storage devices needs a hardware handler,
add the corresponding module to INITRD_MODULES, in addition to
"dm-multipath". For example add "dm-rdac" and "dm-multipath" to support
IBM's DS4K storage devices
   6.  Run mkinitrd
      Note: You can uncomment the user friendly name if you have commented it above.
   7. Reboot 

The system will come up with the root disk on a multipathed device.

Note: You can switch off multipathing to the root device by adding
multipath=off to the kernel command line.

4.2. Installation instructions for RHEL5

Note: This is tested on RHEL5 U1. If you have any other version, your
mileage may vary.

   1. Start the installation with the kernel command line "linux mpath"
          * You will see multipathed devices (/dev/mapper/mpath*) as
          * installation devices. 
   2. Finish the installation.
   3. Reboot.
          * If your boot device does not need multipath.conf and does not
          * have a special hardware handler, then you are done. If you have
          * either of these, follow the steps below. 
   4. Once booted, update multipath.conf file, if needed.
   5. Run mkinitrd, if you need a hardware handler, add it to initrd with --with option.
          * # mkinitrd /boot/initrd.final.img --with=dm-rdac 
   6. Replace the initrd in your grub.conf/lilo.conf/yaboot.conf with the
newly built initrd.
   7. Reboot. 

The system will come up with the root disk on a multipathed device.

Note: You can switch off multipathing to the root device by adding
multipath=off to the kernel command line. Note: By default, RedHat disables
dm-multipath by blacklisting all devices in /etc/multipath.conf. It just
excludes your root device. If you do not see your other multipath devices
through "multipath -ll", then check and fix the blacklist in
/etc/multipath.conf

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Re: Configuring multipath for root device

[Pradipmaya Maharana]

Hi Chandra,

Thanks. I will givei it a try.

Regards,
Pradipmaya.

On 12/19/07, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
> I am working on a multipath usage document. Attached is the installation
> section of that document.
>
> Note that it is written for RHEL5 U1 and SLES10 SP1.
>
> Good Luck,
>
> chandra
>
> On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> > Hi All,
> >
> > Is there a process/document that talks about how to configure
> > root/boot device for multipath?
> >
> > Thanks and Regards,
> > Pradipmaya.
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> --
>
> ----------------------------------------------------------------------
>    Chandra Seetharaman               | Be careful what you choose....
>              - sekharan@us.ibm.com   |      .......you may get it.
> ----------------------------------------------------------------------
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>
>

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Hi,

Pardon my knowledge on Linux, but in your article did you mean that
the /boot should be on a local disk and /root, swap can be on
multipath device.

I am trying to install /boot, /root and swap all on one multipath
device and try to boot from it. It does not boot, no error just blank
screen. My equirement is to install everything on multipath device; so
is it possible at all? I mean can I have the boot device (/boot) too
on a multipath device.

Following is what I tried on RHEL
 - selected "linux mpath"
 - I could see one local disk and 3 multipath devices
 - I chose custom partition type
 - instead of going for LVM, I selected one single multipath device
and installed everything on it (/boot, / and swap).
 - Tried rebooting, it won't boot :(

What am I missing here?

Thanks and Regards,
Pradipmaya.


On 12/19/07, Pradipmaya Maharana <pradipmaya@gmail.com> wrote:
> Hi Chandra,
>
> Thanks. I will givei it a try.
>
> Regards,
> Pradipmaya.
>
> On 12/19/07, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
> > I am working on a multipath usage document. Attached is the installation
> > section of that document.
> >
> > Note that it is written for RHEL5 U1 and SLES10 SP1.
> >
> > Good Luck,
> >
> > chandra
> >
> > On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> > > Hi All,
> > >
> > > Is there a process/document that talks about how to configure
> > > root/boot device for multipath?
> > >
> > > Thanks and Regards,
> > > Pradipmaya.
> > >
> > > --
> > > dm-devel mailing list
> > > dm-devel@redhat.com
> > > https://www.redhat.com/mailman/listinfo/dm-devel
> > --
> >
> > ----------------------------------------------------------------------
> >    Chandra Seetharaman               | Be careful what you choose....
> >              - sekharan@us.ibm.com   |      .......you may get it.
> > ----------------------------------------------------------------------
> >
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> >
> >
>

Re: Configuring multipath for root device

[Benjamin Marzinski]

On Thu, Dec 20, 2007 at 08:46:41AM -0800, Pradipmaya Maharana wrote:
> Hi,
> 
> Pardon my knowledge on Linux, but in your article did you mean that
> the /boot should be on a local disk and /root, swap can be on
> multipath device.
> 
> I am trying to install /boot, /root and swap all on one multipath
> device and try to boot from it. It does not boot, no error just blank
> screen. My equirement is to install everything on multipath device; so
> is it possible at all? I mean can I have the boot device (/boot) too
> on a multipath device.
> 
> Following is what I tried on RHEL
>  - selected "linux mpath"
>  - I could see one local disk and 3 multipath devices
>  - I chose custom partition type
>  - instead of going for LVM, I selected one single multipath device
> and installed everything on it (/boot, / and swap).
>  - Tried rebooting, it won't boot :(
> 
> What am I missing here?

I haven't ever tried putting swap on a multipath device, but I believe
it should work.  Your steps seem correct. Are you getting any messages
at all on the console when you boot up?

One thing you need to be aware of is that while multipathed root is
pretty simple, for multipathed boot to work, your machine needs to be
able to boot from the device that your are multipathing with no help
from any linux device drivers (since they obviously can't be loaded
until you run the boot loader).  I believe some machines need something
to be set in BIOS in order to try and boot off SAN storage.

To narrow down the problem, I would try setting up the same
configuration, but without multipathing the device. If this doesn't
work, then you are probably having problems booting from your storage.
If it does work, then when you set it up with multipathing, you should
at least be making it past GRUB, and looking at the console output
should shed some light on what's going wrong.

Note, if you have a device that needs a prio_callout, multipath will
still fail in the all paths down case, because it can't access the
callout program.  The upstream code currently fixes that by using
callout library functions, and the next device-mapper-multipath package
from RHEL will fix it by caching the callouts in a private namespace.

-Ben

> Thanks and Regards,
> Pradipmaya.
> 
> 
> On 12/19/07, Pradipmaya Maharana <pradipmaya@gmail.com> wrote:
> > Hi Chandra,
> >
> > Thanks. I will givei it a try.
> >
> > Regards,
> > Pradipmaya.
> >
> > On 12/19/07, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
> > > I am working on a multipath usage document. Attached is the installation
> > > section of that document.
> > >
> > > Note that it is written for RHEL5 U1 and SLES10 SP1.
> > >
> > > Good Luck,
> > >
> > > chandra
> > >
> > > On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> > > > Hi All,
> > > >
> > > > Is there a process/document that talks about how to configure
> > > > root/boot device for multipath?
> > > >
> > > > Thanks and Regards,
> > > > Pradipmaya.
> > > >
> > > > --
> > > > dm-devel mailing list
> > > > dm-devel@redhat.com
> > > > https://www.redhat.com/mailman/listinfo/dm-devel
> > > --
> > >
> > > ----------------------------------------------------------------------
> > >    Chandra Seetharaman               | Be careful what you choose....
> > >              - sekharan@us.ibm.com   |      .......you may get it.
> > > ----------------------------------------------------------------------
> > >
> > >
> > > --
> > > dm-devel mailing list
> > > dm-devel@redhat.com
> > > https://www.redhat.com/mailman/listinfo/dm-devel
> > >
> > >
> >
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Hey Ben,

Thanks for your inputs. I will give it another try and let you know if
it worked.

Regards,
Pradipmaya.

On 12/21/07, Benjamin Marzinski <bmarzins@redhat.com> wrote:
> On Thu, Dec 20, 2007 at 08:46:41AM -0800, Pradipmaya Maharana wrote:
> > Hi,
> >
> > Pardon my knowledge on Linux, but in your article did you mean that
> > the /boot should be on a local disk and /root, swap can be on
> > multipath device.
> >
> > I am trying to install /boot, /root and swap all on one multipath
> > device and try to boot from it. It does not boot, no error just blank
> > screen. My equirement is to install everything on multipath device; so
> > is it possible at all? I mean can I have the boot device (/boot) too
> > on a multipath device.
> >
> > Following is what I tried on RHEL
> >  - selected "linux mpath"
> >  - I could see one local disk and 3 multipath devices
> >  - I chose custom partition type
> >  - instead of going for LVM, I selected one single multipath device
> > and installed everything on it (/boot, / and swap).
> >  - Tried rebooting, it won't boot :(
> >
> > What am I missing here?
>
> I haven't ever tried putting swap on a multipath device, but I believe
> it should work.  Your steps seem correct. Are you getting any messages
> at all on the console when you boot up?
>
> One thing you need to be aware of is that while multipathed root is
> pretty simple, for multipathed boot to work, your machine needs to be
> able to boot from the device that your are multipathing with no help
> from any linux device drivers (since they obviously can't be loaded
> until you run the boot loader).  I believe some machines need something
> to be set in BIOS in order to try and boot off SAN storage.
>
> To narrow down the problem, I would try setting up the same
> configuration, but without multipathing the device. If this doesn't
> work, then you are probably having problems booting from your storage.
> If it does work, then when you set it up with multipathing, you should
> at least be making it past GRUB, and looking at the console output
> should shed some light on what's going wrong.
>
> Note, if you have a device that needs a prio_callout, multipath will
> still fail in the all paths down case, because it can't access the
> callout program.  The upstream code currently fixes that by using
> callout library functions, and the next device-mapper-multipath package
> from RHEL will fix it by caching the callouts in a private namespace.
>
> -Ben
>
> > Thanks and Regards,
> > Pradipmaya.
> >
> >
> > On 12/19/07, Pradipmaya Maharana <pradipmaya@gmail.com> wrote:
> > > Hi Chandra,
> > >
> > > Thanks. I will givei it a try.
> > >
> > > Regards,
> > > Pradipmaya.
> > >
> > > On 12/19/07, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
> > > > I am working on a multipath usage document. Attached is the installation
> > > > section of that document.
> > > >
> > > > Note that it is written for RHEL5 U1 and SLES10 SP1.
> > > >
> > > > Good Luck,
> > > >
> > > > chandra
> > > >
> > > > On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> > > > > Hi All,
> > > > >
> > > > > Is there a process/document that talks about how to configure
> > > > > root/boot device for multipath?
> > > > >
> > > > > Thanks and Regards,
> > > > > Pradipmaya.
> > > > >
> > > > > --
> > > > > dm-devel mailing list
> > > > > dm-devel@redhat.com
> > > > > https://www.redhat.com/mailman/listinfo/dm-devel
> > > > --
> > > >
> > > > ----------------------------------------------------------------------
> > > >    Chandra Seetharaman               | Be careful what you choose....
> > > >              - sekharan@us.ibm.com   |      .......you may get it.
> > > > ----------------------------------------------------------------------
> > > >
> > > >
> > > > --
> > > > dm-devel mailing list
> > > > dm-devel@redhat.com
> > > > https://www.redhat.com/mailman/listinfo/dm-devel
> > > >
> > > >
> > >
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[Hannes Reinecke]

Chandra Seetharaman wrote:
> I am working on a multipath usage document. Attached is the installation
> section of that document.
> 
> Note that it is written for RHEL5 U1 and SLES10 SP1.
> 
> Good Luck,
> 
> chandra
> 
> On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
>> Hi All,
>>
>> Is there a process/document that talks about how to configure
>> root/boot device for multipath?
>>
>> Thanks and Regards,
>> Pradipmaya.
>>
>> --
>> dm-devel mailing list
>> dm-devel@redhat.com
>> https://www.redhat.com/mailman/listinfo/dm-devel
>>
>> ------------------------------------------------------------------------
>>
>> 4.1. Installation instructions for SLES10
>>
>> Note: This is tested on SLES10 SP1. If you have any other version, your
>> mileage may vary.
>>
>>    1. Install the OS in a device that has multiple paths. Make sure the
>> root device's "Mount by" option is set to "Device by-id" (this option is
>> available under "expert partitioner" as "fstab options").
>>    2. Complete the installation. Let the system boot up in multiuser mode.
>> Make sure the root device, swap device are all referenced by their by-id
>> device node entries instead of /dev/sd* type names. If they are not, fix
>> them first.
>>    3. Once booted, update /etc/multipath.conf If you have to make changes
>> to /etc/multipath.conf, make the changes.
>>       Note: the option "user_friendly_names" is not supported by initrd.
>> So, if you have user_friendly_names in your /etc/multipath.conf file,
>> comment it for now, you can uncomment it later.
>>    4. Enable multipathing by running the following commands
>>           * chkconfig boot.multipath on
>>
>>           * chkconfig multipathd on 
>>    5. Add multipath module to initrd
>>
>>       Edit the file /etc/sysconfig/kernel and add "dm-multipath" to
>> INITRD_MODULES". Note: If your storage devices needs a hardware handler,
>> add the corresponding module to INITRD_MODULES, in addition to
>> "dm-multipath". For example add "dm-rdac" and "dm-multipath" to support
>> IBM's DS4K storage devices
>>    6.  Run mkinitrd
>>       Note: You can uncomment the user friendly name if you have commented it above.
>>    7. Reboot 
>>
>> The system will come up with the root disk on a multipathed device.
>>
>> Note: You can switch off multipathing to the root device by adding
>> multipath=off to the kernel command line.
>>
ACK. This is the correct way.

Thanks for writing this up.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Hi All,

Yes, I tried the steps and it worked for me.
Thanks for your help.

Regards,
Pradipmaya.


On Jan 6, 2008 11:38 PM, Hannes Reinecke <hare@suse.de> wrote:
> Chandra Seetharaman wrote:
> > I am working on a multipath usage document. Attached is the installation
> > section of that document.
> >
> > Note that it is written for RHEL5 U1 and SLES10 SP1.
> >
> > Good Luck,
> >
> > chandra
> >
> > On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> >> Hi All,
> >>
> >> Is there a process/document that talks about how to configure
> >> root/boot device for multipath?
> >>
> >> Thanks and Regards,
> >> Pradipmaya.
> >>
> >> --
> >> dm-devel mailing list
> >> dm-devel@redhat.com
> >> https://www.redhat.com/mailman/listinfo/dm-devel
> >>
> >> ------------------------------------------------------------------------
> >>
> >> 4.1. Installation instructions for SLES10
> >>
> >> Note: This is tested on SLES10 SP1. If you have any other version, your
> >> mileage may vary.
> >>
> >>    1. Install the OS in a device that has multiple paths. Make sure the
> >> root device's "Mount by" option is set to "Device by-id" (this option is
> >> available under "expert partitioner" as "fstab options").
> >>    2. Complete the installation. Let the system boot up in multiuser mode.
> >> Make sure the root device, swap device are all referenced by their by-id
> >> device node entries instead of /dev/sd* type names. If they are not, fix
> >> them first.
> >>    3. Once booted, update /etc/multipath.conf If you have to make changes
> >> to /etc/multipath.conf, make the changes.
> >>       Note: the option "user_friendly_names" is not supported by initrd.
> >> So, if you have user_friendly_names in your /etc/multipath.conf file,
> >> comment it for now, you can uncomment it later.
> >>    4. Enable multipathing by running the following commands
> >>           * chkconfig boot.multipath on
> >>
> >>           * chkconfig multipathd on
> >>    5. Add multipath module to initrd
> >>
> >>       Edit the file /etc/sysconfig/kernel and add "dm-multipath" to
> >> INITRD_MODULES". Note: If your storage devices needs a hardware handler,
> >> add the corresponding module to INITRD_MODULES, in addition to
> >> "dm-multipath". For example add "dm-rdac" and "dm-multipath" to support
> >> IBM's DS4K storage devices
> >>    6.  Run mkinitrd
> >>       Note: You can uncomment the user friendly name if you have commented it above.
> >>    7. Reboot
> >>
> >> The system will come up with the root disk on a multipathed device.
> >>
> >> Note: You can switch off multipathing to the root device by adding
> >> multipath=off to the kernel command line.
> >>
> ACK. This is the correct way.
>
> Thanks for writing this up.
>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                   zSeries & Storage
> hare@suse.de                          +49 911 74053 688
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: Markus Rex, HRB 16746 (AG Nürnberg)
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[Pradipmaya Maharana]

RHEL Steps worked perfectly for me but i have a question for SLES installation.

Question. While installing SLES on multipath devices, the second step says:

" 2. Complete the installation. Let the system boot up in multiuser mode.
Make sure the root device, swap device are all referenced by their by-id
device node entries instead of /dev/sd* type names. If they are not, fix
them first."

How do you check that root device and swap device are referenced by their by-id?
And if it is not referenced by the by-id, how do I fix it? Re-install?

Thanks and Regards,
Pradipmaya.


On Dec 19, 2007 1:18 PM, Chandra Seetharaman <sekharan@us.ibm.com> wrote:
> I am working on a multipath usage document. Attached is the installation
> section of that document.
>
> Note that it is written for RHEL5 U1 and SLES10 SP1.
>
> Good Luck,
>
> chandra
>
>
> On Wed, 2007-12-19 at 13:02 -0800, Pradipmaya Maharana wrote:
> > Hi All,
> >
> > Is there a process/document that talks about how to configure
> > root/boot device for multipath?
> >
> > Thanks and Regards,
> > Pradipmaya.
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> --
>
> ----------------------------------------------------------------------
>    Chandra Seetharaman               | Be careful what you choose....
>              - sekharan@us.ibm.com   |      .......you may get it.
> ----------------------------------------------------------------------
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> RHEL Steps worked perfectly for me but i have a question for SLES installation.
> 
> Question. While installing SLES on multipath devices, the second step says:
> 
> " 2. Complete the installation. Let the system boot up in multiuser mode.
> Make sure the root device, swap device are all referenced by their by-id
> device node entries instead of /dev/sd* type names. If they are not, fix
> them first."
> 
> How do you check that root device and swap device are referenced by their by-id?
> And if it is not referenced by the by-id, how do I fix it? Re-install?

Look at your grub.conf and see what is there for root and also look at
/etc/fstab and make sure everything there is also ID based.

Malahal.

Re: Configuring multipath for root device

[Pradipmaya Maharana]

I followed the instruction for SLES, that is, while installing,
selected the option for mounting the device by "device id" but after
reboot mount, fstab shows device names, like /dev/sda2, etc.
What am I missing.

Regards,
Pradipmaya.


On Jan 7, 2008 12:28 PM,  <malahal@us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> > RHEL Steps worked perfectly for me but i have a question for SLES installation.
> >
> > Question. While installing SLES on multipath devices, the second step says:
> >
> > " 2. Complete the installation. Let the system boot up in multiuser mode.
> > Make sure the root device, swap device are all referenced by their by-id
> > device node entries instead of /dev/sd* type names. If they are not, fix
> > them first."
> >
> > How do you check that root device and swap device are referenced by their by-id?
> > And if it is not referenced by the by-id, how do I fix it? Re-install?
>
> Look at your grub.conf and see what is there for root and also look at
> /etc/fstab and make sure everything there is also ID based.
>
> Malahal.
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> I followed the instruction for SLES, that is, while installing,
> selected the option for mounting the device by "device id" but after
> reboot mount, fstab shows device names, like /dev/sda2, etc.
> What am I missing.

That is odd. You will have to select "device id" for each file system
including swap. I only used 'expert partition' on SLES10 SP1 installs
and it put everything with ID names.

-Malahal.

Re: Configuring multipath for root device

[Pradipmaya Maharana]

I did exactly what you said for SLES 10.1,
- Create custom partition
- Created partitions for /boot, / and swap of 100MB, 5GB and 1024MB
respectively on /dev/sda. So /dev/sda1 is for "/boot", /dev/sda2 for
"/" and /dev/sda3 for "swap"
- Under fstab option, selected Mount by device-id for each of the partition
- Reboot is fine
- But as I said earlier, mount, fstab, everything shows devcie names, not id

Any way to mount it by device-id?
Is there a way that it can be chaned after installation? Or re-install
is the only way.

Regards,
Pradipmaya.


On Jan 7, 2008 12:46 PM,  <malahal@us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> > I followed the instruction for SLES, that is, while installing,
> > selected the option for mounting the device by "device id" but after
> > reboot mount, fstab shows device names, like /dev/sda2, etc.
> > What am I missing.
>
> That is odd. You will have to select "device id" for each file system
> including swap. I only used 'expert partition' on SLES10 SP1 installs
> and it put everything with ID names.
>
> -Malahal.
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> I did exactly what you said for SLES 10.1,
> - Create custom partition
> - Created partitions for /boot, / and swap of 100MB, 5GB and 1024MB
> respectively on /dev/sda. So /dev/sda1 is for "/boot", /dev/sda2 for
> "/" and /dev/sda3 for "swap"
> - Under fstab option, selected Mount by device-id for each of the partition
> - Reboot is fine
> - But as I said earlier, mount, fstab, everything shows devcie names, not id
> 
> Any way to mount it by device-id?
> Is there a way that it can be chaned after installation? Or re-install
> is the only way.

I would just replace sd* names by their equivalent by-id names in fstab
and grub.conf. Do 'ls -l /dev/disk/by-id/*' to get the by-id names
corresponding to your named partitions'

No need to re-install.


-Malahal.

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Ok, so this is what the scene is :

linux-g78h:~ # ls -al /dev/disk/by-id/
total 0
drwxr-xr-x 2 root root 220 Jan  7 12:44 .
drwxr-xr-x 5 root root 100 Jan  7 12:44 ..
lrwxrwxrwx 1 root root   9 Jan  7 12:44 edd-int13_dev80 -> ../../sda
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part1 -> ../../sda1
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part2 -> ../../sda2
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part3 -> ../../sda3
lrwxrwxrwx 1 root root   9 Jan  7 12:44 scsi-2221b000155f5d2d4 -> ../../sdb
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part1
-> ../../sda1
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part2
-> ../../sda2
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part3
-> ../../sda3
lrwxrwxrwx 1 root root   9 Jan  7 12:44 usb-ASUS_CB-5216A_DEF10A4090DF
-> ../../sr0
linux-g78h:~ #
linux-g78h:~ # uname -a
Linux linux-g78h 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC
2007 i686 i686 i386 GNU/Linux
linux-g78h:~ #
linux-g78h:~ # cat /etc/grub.conf
setup --stage2=/boot/grub/stage2 (hd0,0) (hd0,0)
quit
linux-g78h:~ #
linux-g78h:~ # cat /boot/grub/menu.lst
# Modified by YaST2. Last modification on Mon Jan  7 19:40:30 UTC 2008
default 0
timeout 8
##YaST - generic_mbr
gfxmenu (hd0,0)/message
##YaST - activate

###Don't change this comment - YaST2 identifier: Original name: linux###
title SUSE Linux Enterprise Server 10 SP1
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
resume=/dev/sda3 showopts
    initrd /initrd-2.6.16.46-0.12-smp

###Don't change this comment - YaST2 identifier: Original name: failsafe###
title Failsafe -- SUSE Linux Enterprise Server 10 SP1
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=normal
showopts ide=nodma apm=off acpi=off noresume nosmp noapic maxcpus=0
edd=off 3
    initrd /initrd-2.6.16.46-0.12-smp

###Don't change this comment - YaST2 identifier: Original name: linux###
title SUSE Linux Enterprise Server 10 SP1 ORG
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
resume=/dev/sda3 showopts
    initrd /initrd-2.6.16.46-0.org.12-smp


So, I modified the fstab and menu.lst to replace all /dev/sdaX with
/dev/scsi-2221b000155f5d2d4-partX. It won't boot.

Any comments?

Thanks and Regards,
Pradipmaya.

On Jan 7, 2008 1:57 PM,  <malahal@us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> > I did exactly what you said for SLES 10.1,
> > - Create custom partition
> > - Created partitions for /boot, / and swap of 100MB, 5GB and 1024MB
> > respectively on /dev/sda. So /dev/sda1 is for "/boot", /dev/sda2 for
> > "/" and /dev/sda3 for "swap"
> > - Under fstab option, selected Mount by device-id for each of the partition
> > - Reboot is fine
> > - But as I said earlier, mount, fstab, everything shows devcie names, not id
> >
> > Any way to mount it by device-id?
> > Is there a way that it can be chaned after installation? Or re-install
> > is the only way.
>
> I would just replace sd* names by their equivalent by-id names in fstab
> and grub.conf. Do 'ls -l /dev/disk/by-id/*' to get the by-id names
> corresponding to your named partitions'
>
> No need to re-install.
>
>
>
> -Malahal.
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> Ok, so this is what the scene is :
> 
> linux-g78h:~ # ls -al /dev/disk/by-id/
> total 0
> drwxr-xr-x 2 root root 220 Jan  7 12:44 .
> drwxr-xr-x 5 root root 100 Jan  7 12:44 ..
> lrwxrwxrwx 1 root root   9 Jan  7 12:44 edd-int13_dev80 -> ../../sda
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part1 -> ../../sda1
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part2 -> ../../sda2
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part3 -> ../../sda3
> lrwxrwxrwx 1 root root   9 Jan  7 12:44 scsi-2221b000155f5d2d4 -> ../../sdb
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part1
> -> ../../sda1
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part2
> -> ../../sda2
> lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part3
> -> ../../sda3
> lrwxrwxrwx 1 root root   9 Jan  7 12:44 usb-ASUS_CB-5216A_DEF10A4090DF
> -> ../../sr0
> linux-g78h:~ #
> linux-g78h:~ # uname -a
> Linux linux-g78h 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC
> 2007 i686 i686 i386 GNU/Linux
> linux-g78h:~ #
> linux-g78h:~ # cat /etc/grub.conf
> setup --stage2=/boot/grub/stage2 (hd0,0) (hd0,0)
> quit
> linux-g78h:~ #
> linux-g78h:~ # cat /boot/grub/menu.lst
> # Modified by YaST2. Last modification on Mon Jan  7 19:40:30 UTC 2008
> default 0
> timeout 8
> ##YaST - generic_mbr
> gfxmenu (hd0,0)/message
> ##YaST - activate
> 
> ###Don't change this comment - YaST2 identifier: Original name: linux###
> title SUSE Linux Enterprise Server 10 SP1
>     root (hd0,0)
>     kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
> resume=/dev/sda3 showopts
>     initrd /initrd-2.6.16.46-0.12-smp
> 
> ###Don't change this comment - YaST2 identifier: Original name: failsafe###
> title Failsafe -- SUSE Linux Enterprise Server 10 SP1
>     root (hd0,0)
>     kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=normal
> showopts ide=nodma apm=off acpi=off noresume nosmp noapic maxcpus=0
> edd=off 3
>     initrd /initrd-2.6.16.46-0.12-smp
> 
> ###Don't change this comment - YaST2 identifier: Original name: linux###
> title SUSE Linux Enterprise Server 10 SP1 ORG
>     root (hd0,0)
>     kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
> resume=/dev/sda3 showopts
>     initrd /initrd-2.6.16.46-0.org.12-smp
> 
> 
> So, I modified the fstab and menu.lst to replace all /dev/sdaX with
> /dev/scsi-2221b000155f5d2d4-partX. It won't boot.

/dev/scsi-2221b000155f5d2d4-partX is bogus! Your root device /dev/sda2
actually is edd-int13_dev80-part2, specifically it is
/dev/disk/by-id/edd-int13_dev80-part2.  You should replace /dev/sdaX
with /dev/disk/by-id/edd-int13_dev80-partX

Also, make sure that what ever you replace with is a valid name. For
example, /dev/scsi-2221b000155f5d2d4-partX will NOT exist on your
system where as /dev/disk/by-id/edd-int13_dev80-part2 should exist.

Re: Configuring multipath for root device

[Hannes Reinecke]

Pradipmaya Maharana wrote:
> RHEL Steps worked perfectly for me but i have a question for SLES installation.
> 
> Question. While installing SLES on multipath devices, the second step says:
> 
> " 2. Complete the installation. Let the system boot up in multiuser mode.
> Make sure the root device, swap device are all referenced by their by-id
> device node entries instead of /dev/sd* type names. If they are not, fix
> them first."
> 
> How do you check that root device and swap device are referenced by their by-id?
> And if it is not referenced by the by-id, how do I fix it? Re-install?
> 
Check /etc/fstab. Those devices should be listed as /dev/disk/by-id/XXX.
If not (ie if their names are /dev/sdXX) look for the appropriate symlink
in /dev/disk/by-id and edit /etc/fstab.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Hi All,

Thanks for all your comments, it worked for installaions on partitions.

Now the question is:
Is it supposed to work the same way if the SLES is installed on LVM?
On SLES, under fstab, I do not see any device, except for the boot
device; other entries does not have /dev/deisk mention. In such
scenario, how am I supposed to make the /root device multipath-aware?

I tried the same with RHEL, but with RHEL installed (with linux mpath)
on LVM, it seems to be working fine. Is there anything I am missing on
SLES?

Thanks and Regards,
Pradipmaya.



On Jan 7, 2008 11:17 PM, Hannes Reinecke <hare@suse.de> wrote:
> Pradipmaya Maharana wrote:
> > RHEL Steps worked perfectly for me but i have a question for SLES installation.
> >
> > Question. While installing SLES on multipath devices, the second step says:
> >
> > " 2. Complete the installation. Let the system boot up in multiuser mode.
> > Make sure the root device, swap device are all referenced by their by-id
> > device node entries instead of /dev/sd* type names. If they are not, fix
> > them first."
> >
> > How do you check that root device and swap device are referenced by their by-id?
> > And if it is not referenced by the by-id, how do I fix it? Re-install?
> >
> Check /etc/fstab. Those devices should be listed as /dev/disk/by-id/XXX.
> If not (ie if their names are /dev/sdXX) look for the appropriate symlink
> in /dev/disk/by-id and edit /etc/fstab.
>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                   zSeries & Storage
> hare@suse.de                          +49 911 74053 688
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: Markus Rex, HRB 16746 (AG Nürnberg)
>
> --
>
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[Chandra Seetharaman]

On Tue, 2008-01-15 at 18:25 -0800, Pradipmaya Maharana wrote:
> Hi All,
> 
> Thanks for all your comments, it worked for installaions on partitions.

Cool.
> 
> Now the question is:
> Is it supposed to work the same way if the SLES is installed on LVM?

Supposed to :)

> On SLES, under fstab, I do not see any device, except for the boot
> device; other entries does not have /dev/deisk mention. In such

I am not clear about what you are mentioning here. Can you annotate with
a cut-n-paste of /etc/fstab ?

> scenario, how am I supposed to make the /root device multipath-aware?
> 
> I tried the same with RHEL, but with RHEL installed (with linux mpath)
> on LVM, it seems to be working fine. Is there anything I am missing on
> SLES?
> 
> Thanks and Regards,
> Pradipmaya.
> 
> 
> 
> On Jan 7, 2008 11:17 PM, Hannes Reinecke <hare@suse.de> wrote:
> > Pradipmaya Maharana wrote:
> > > RHEL Steps worked perfectly for me but i have a question for SLES installation.
> > >
> > > Question. While installing SLES on multipath devices, the second step says:
> > >
> > > " 2. Complete the installation. Let the system boot up in multiuser mode.
> > > Make sure the root device, swap device are all referenced by their by-id
> > > device node entries instead of /dev/sd* type names. If they are not, fix
> > > them first."
> > >
> > > How do you check that root device and swap device are referenced by their by-id?
> > > And if it is not referenced by the by-id, how do I fix it? Re-install?
> > >
> > Check /etc/fstab. Those devices should be listed as /dev/disk/by-id/XXX.
> > If not (ie if their names are /dev/sdXX) look for the appropriate symlink
> > in /dev/disk/by-id and edit /etc/fstab.
> >
> > Cheers,
> >
> > Hannes
> > --
> > Dr. Hannes Reinecke                   zSeries & Storage
> > hare@suse.de                          +49 911 74053 688
> > SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> > GF: Markus Rex, HRB 16746 (AG Nürnberg)
> >
> > --
> >
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> >
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------

RE: Configuring multipath for root device

[Romanowski, John (OFT)]

I'm very new to sles 10; sounds like you want to do root-on-LVM-on-multipath 
I don't know if sles10 supports that.

Maybe 2 things to try: 
(1) if /dev/rootVG/rootLV has a /dev/disk/by-id/ link then use that persistent name along with putting dm-multipath in INITRD modules list; then run mkinitrd and zipl

(2) Or, use the LVM persistent name, /dev/rootVG/rootLV, instead of a /dev/disk/by-id/ name

good luck.


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-----Original Message-----

From: dm-devel-bounces@redhat.com on behalf of Chandra Seetharaman
Sent: Tue 1/15/2008 9:32 PM
To: device-mapper development
Subject: Re: [dm-devel] Configuring multipath for root device
 
On Tue, 2008-01-15 at 18:25 -0800, Pradipmaya Maharana wrote:
> Hi All,
> 
> Thanks for all your comments, it worked for installaions on partitions.

Cool.
> 
> Now the question is:
> Is it supposed to work the same way if the SLES is installed on LVM?

Supposed to :)

> On SLES, under fstab, I do not see any device, except for the boot
> device; other entries does not have /dev/deisk mention. In such

I am not clear about what you are mentioning here. Can you annotate with
a cut-n-paste of /etc/fstab ?

> scenario, how am I supposed to make the /root device multipath-aware?
> 
> I tried the same with RHEL, but with RHEL installed (with linux mpath)
> on LVM, it seems to be working fine. Is there anything I am missing on
> SLES?
> 
> Thanks and Regards,
> Pradipmaya.
> 
> 
> 
> On Jan 7, 2008 11:17 PM, Hannes Reinecke <hare@suse.de> wrote:
> > Pradipmaya Maharana wrote:
> > > RHEL Steps worked perfectly for me but i have a question for SLES installation.
> > >
> > > Question. While installing SLES on multipath devices, the second step says:
> > >
> > > " 2. Complete the installation. Let the system boot up in multiuser mode.
> > > Make sure the root device, swap device are all referenced by their by-id
> > > device node entries instead of /dev/sd* type names. If they are not, fix
> > > them first."
> > >
> > > How do you check that root device and swap device are referenced by their by-id?
> > > And if it is not referenced by the by-id, how do I fix it? Re-install?
> > >
> > Check /etc/fstab. Those devices should be listed as /dev/disk/by-id/XXX.
> > If not (ie if their names are /dev/sdXX) look for the appropriate symlink
> > in /dev/disk/by-id and edit /etc/fstab.
> >
> > Cheers,
> >
> > Hannes
> > --
> > Dr. Hannes Reinecke                   zSeries & Storage
> > hare@suse.de                          +49 911 74053 688
> > SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> > GF: Markus Rex, HRB 16746 (AG Nürnberg)
> >
> > --
> >
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> >
> 
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------


--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> Hi All,
> 
> Thanks for all your comments, it worked for installaions on partitions.
> 
> Now the question is:
> Is it supposed to work the same way if the SLES is installed on LVM?

Hmmm, I don't know if LVM devices have by-id names. I never installed
SLES on LVM with multipath. Label is your best friend with LVM and that
is what RHEL uses, I believe.

> On SLES, under fstab, I do not see any device, except for the boot
> device; other entries does not have /dev/deisk mention. In such
> scenario, how am I supposed to make the /root device multipath-aware?

They probably have labels???

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Here are some details:

linux-qeh4:~ # ls -al /dev/disk/by-id/
total 0
drwxr-xr-x 2 root root 180 Jan 16 10:39 .
drwxr-xr-x 5 root root 100 Jan 16 10:12 ..
lrwxrwxrwx 1 root root   9 Jan 16 10:12 edd-int13_dev80 -> ../../sda
lrwxrwxrwx 1 root root  10 Jan 16 10:12 edd-int13_dev80-part1 -> ../../sda1
lrwxrwxrwx 1 root root  10 Jan 16 10:12 edd-int13_dev80-part2 -> ../../sda2
lrwxrwxrwx 1 root root   9 Jan 16 10:12 scsi-222f2000155c11879 -> ../../sdb
lrwxrwxrwx 1 root root  10 Jan 16 10:12 scsi-222f2000155c11879-part1
-> ../../sda1
lrwxrwxrwx 1 root root  10 Jan 16 10:12 scsi-222f2000155c11879-part2
-> ../../sda2
linux-qeh4:~ #
linux-qeh4:~ #
linux-qeh4:~ # cat /etc/fstab
/dev/system/root     /                    reiserfs   acl,user_xattr        1 1
/dev/sda1            /boot                ext2       acl,user_xattr        1 2
/dev/system/swap     swap                 swap       defaults              0 0
proc                 /proc                proc       defaults              0 0
sysfs                /sys                 sysfs      noauto                0 0
debugfs              /sys/kernel/debug    debugfs    noauto                0 0
usbfs                /proc/bus/usb        usbfs      noauto                0 0
devpts               /dev/pts             devpts     mode=0620,gid=5       0 0
linux-qeh4:~ #
linux-qeh4:~ #
linux-qeh4:~ # uname -a
Linux linux-qeh4 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC
2007 i686 i686 i386 GNU/Linux
linux-qeh4:~ #
linux-qeh4:~ # mount
/dev/mapper/system-root on / type reiserfs (rw,acl,user_xattr)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
debugfs on /sys/kernel/debug type debugfs (rw)
udev on /dev type tmpfs (rw)
devpts on /dev/pts type devpts (rw,mode=0620,gid=5)
/dev/sda1 on /boot type ext2 (rw,acl,user_xattr)
securityfs on /sys/kernel/security type securityfs (rw)

Let me know if you need any other information.

Malahal, are you saying that I should mount the "/" and "swap" by
volume label and it should be able to boot fine?

Thanks and Regards,
Pradipmaya.



On Jan 16, 2008 9:36 AM,  <malahal@us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> > Hi All,
> >
> > Thanks for all your comments, it worked for installaions on partitions.
> >
> > Now the question is:
> > Is it supposed to work the same way if the SLES is installed on LVM?
>
> Hmmm, I don't know if LVM devices have by-id names. I never installed
> SLES on LVM with multipath. Label is your best friend with LVM and that
> is what RHEL uses, I believe.
>
> > On SLES, under fstab, I do not see any device, except for the boot
> > device; other entries does not have /dev/deisk mention. In such
> > scenario, how am I supposed to make the /root device multipath-aware?
>
> They probably have labels???
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[malahal]

Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> 
> Let me know if you need any other information.
> 
> Malahal, are you saying that I should mount the "/" and "swap" by
> volume label and it should be able to boot fine?

What are /dev/system/root and /dev/system/swap? Are they symlinks or do
they have same major/minor number of corresponding LVM LVs?
Yes, volume labels may work but I never booted SLES with LVM.

-Malahal.

Re: Configuring multipath for root device

[Pradipmaya Maharana]

# ls -al /dev/system/
total 0
drwx------  2 root root   80 Jan 16 17:44 .
drwxr-xr-x 11 root root 6660 Jan 16 17:46 ..
lrwxrwxrwx  1 root root   23 Jan 16 17:44 root -> /dev/mapper/system-root
lrwxrwxrwx  1 root root   23 Jan 16 17:44 swap -> /dev/mapper/system-swap

Yes, /dev/system/root and swap are links, as shown above.

About volume labels, I tried assigning label to mount /dev/system/root
to label-root but it would fail.
I tried doing it through YaST/partitioner and it failed with the
following error:

"Failure occurred during following action:
Setting label on /dev/system/root to label-root.

System error code was : -3024"

Is there any other way to change the label.


Further information:
when I try to run "multipath -v3", it would not create any map , with
following error
222f2000155c11879: set ACT_CREATE (map does not exist)
222f2000155c11879: domap (0) failure for create/reload map

Thanks and Regards,
Pradipmaya.

On Jan 17, 2008 12:21 PM,  <malahal@us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> >
> > Let me know if you need any other information.
> >
> > Malahal, are you saying that I should mount the "/" and "swap" by
> > volume label and it should be able to boot fine?
>
> What are /dev/system/root and /dev/system/swap? Are they symlinks or do
> they have same major/minor number of corresponding LVM LVs?
> Yes, volume labels may work but I never booted SLES with LVM.
>
> -Malahal.
>
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>

Re: Configuring multipath for root device

[Pradipmaya Maharana]

Any comment anyone?

Thanks,
Pradipmaya.


On Jan 17, 2008 12:38 PM, Pradipmaya Maharana <pradipmaya@gmail.com> wrote:
> # ls -al /dev/system/
> total 0
> drwx------  2 root root   80 Jan 16 17:44 .
> drwxr-xr-x 11 root root 6660 Jan 16 17:46 ..
> lrwxrwxrwx  1 root root   23 Jan 16 17:44 root -> /dev/mapper/system-root
> lrwxrwxrwx  1 root root   23 Jan 16 17:44 swap -> /dev/mapper/system-swap
>
> Yes, /dev/system/root and swap are links, as shown above.
>
> About volume labels, I tried assigning label to mount /dev/system/root
> to label-root but it would fail.
> I tried doing it through YaST/partitioner and it failed with the
> following error:
>
> "Failure occurred during following action:
> Setting label on /dev/system/root to label-root.
>
> System error code was : -3024"
>
> Is there any other way to change the label.
>
>
> Further information:
> when I try to run "multipath -v3", it would not create any map , with
> following error
> 222f2000155c11879: set ACT_CREATE (map does not exist)
> 222f2000155c11879: domap (0) failure for create/reload map
>
> Thanks and Regards,
> Pradipmaya.
>
>
> On Jan 17, 2008 12:21 PM,  <malahal@us.ibm.com> wrote:
> > Pradipmaya Maharana [pradipmaya@gmail.com] wrote:
> > >
> > > Let me know if you need any other information.
> > >
> > > Malahal, are you saying that I should mount the "/" and "swap" by
> > > volume label and it should be able to boot fine?
> >
> > What are /dev/system/root and /dev/system/swap? Are they symlinks or do
> > they have same major/minor number of corresponding LVM LVs?
> > Yes, volume labels may work but I never booted SLES with LVM.
> >
> > -Malahal.
> >
> >
> > --
> > dm-devel mailing list
> > dm-devel@redhat.com
> > https://www.redhat.com/mailman/listinfo/dm-devel
> >
>