[linux-lvm] Can't install LVM 1.0.7 on Redhat Advanced Server 2.1 Please help.

[linux-lvm] Can't install LVM 1.0.7 on Redhat Advanced Server 2.1 Please help.

[Gene]

I have been struggling over the past 5 hours to get
LVM installed on my RH AS 2.1 server but it's just no
go. I have the 2.4.9-e.25enterprise kernel installed,
and when I am done un-tarring the files. 

I run the ./configure --with-kernel_dir=/boot    
command, as I could not find a /usr/src/linux
directory.. (There are no directories under /usr/src)

Apparently, half-way during there was an error saying 

=====
linuxver - /boot/Makefile does not exist
*** Unable to determine version of linux to build
patches for ***
*** Consider using the --with-kernel_dir flag         
       ***
=========
Does anyone know where the kernel_dir for RH AS is? I
would think it's in the /boot folder.

 grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making
changes to this file
# NOTICE:  You have a /boot partition.  This means
that
#          all kernel and initrd paths are relative to
/boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro
root=/dev/ida/c0d5p3
#          initrd /initrd-version.img
#boot=/dev/ida/c0d0
default=1
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.9-e.25enterprise)
        root (hd0,0)
        kernel /vmlinuz-2.4.9-e.25enterprise ro
root=/dev/ida/c0d5p3
        initrd /initrd-2.4.9-e.25enterprise.img


]# ll /boot
total 18930
-rw-r--r--    1 root     root         5824 Jun 25 
2001 boot.b
-rw-r--r--    1 root     root          612 Jun 25 
2001 chain.b
drwxr-xr-x    2 root     root         1024 Sep 10
19:42 grub
-rw-r--r--    1 root     root       249577 Sep 10
16:47 initrd-2.4.9-e.25enterprise.img
-rw-r--r--    1 root     root       246403 Sep 10 
2003 initrd-2.4.9-e.3enterprise.img
-rw-r--r--    1 root     root       241848 Sep 10 
2003 initrd-2.4.9-e.3.img
-rw-r--r--    1 root     root       246381 Sep 10 
2003 initrd-2.4.9-e.3smp.img
lrwxrwxrwx    1 root     root           14 Sep 10
17:55 kernel.h -> kernel.h-2.4.9
-rw-r--r--    1 root     root          428 Sep 10
18:39 kernel.h-2.4.9
drwx------    2 root     root        12288 Sep 10 
2003 lost+found
-rw-r--r--    1 root     root        23108 Jun 25 
2001 message
lrwxrwxrwx    1 root     root           21 Sep 10 
2003 module-info -> module-info-2.4.9-e.3
-rw-r--r--    1 root     root        13599 Jun  7
06:07 module-info-2.4.9-e.25enterprise
-rw-r--r--    1 root     root        13599 May  4 
2002 module-info-2.4.9-e.3
-rw-r--r--    1 root     root        13599 May  4 
2002 module-info-2.4.9-e.3enterprise
-rw-r--r--    1 root     root        13599 May  4 
2002 module-info-2.4.9-e.3smp
-rw-r--r--    1 root     root          640 Jun 25 
2001 os2_d.b
lrwxrwxrwx    1 root     root           31 Sep 10
17:19 System.map -> System.map-2.4.9-e.25enterprise
-rw-r--r--    1 root     root       469339 Jun  7
06:07 System.map-2.4.9-e.25enterprise
-rw-r--r--    1 root     root       444721 May  4 
2002 System.map-2.4.9-e.3
-rw-r--r--    1 root     root       466214 May  4 
2002 System.map-2.4.9-e.3enterprise
-rw-r--r--    1 root     root       466091 May  4 
2002 System.map-2.4.9-e.3smp
-rwxr-xr-x    1 root     root      3138379 Jun  7
06:07 vmlinux-2.4.9-e.25enterprise
-rwxr-xr-x    1 root     root      2767809 May  4 
2002 vmlinux-2.4.9-e.3
-rwxr-xr-x    1 root     root      3105369 May  4 
2002 vmlinux-2.4.9-e.3enterprise
-rwxr-xr-x    1 root     root      3097034 May  4 
2002 vmlinux-2.4.9-e.3smp
lrwxrwxrwx    1 root     root           17 Sep 10 
2003 vmlinuz -> vmlinuz-2.4.9-e.3
-rw-r--r--    1 root     root      1088359 Jun  7
06:07 vmlinuz-2.4.9-e.25enterprise
-rw-r--r--    1 root     root       997736 May  4 
2002 vmlinuz-2.4.9-e.3
-rw-r--r--    1 root     root      1076755 May  4 
2002 vmlinuz-2.4.9-e.3enterprise
-rw-r--r--    1 root     root      1073371 May  4 
2002 vmlinuz-2.4.9-e.3smp
[root@test grub]# 

If the kernel is located at the boot, how come I can't
seem to configure it right? I need to get the patch
done for my kernel before it works, right now none of
the LVM commands work.

I have read the INSTALL and README file but still have
no clues.

Appreciate any help rendered.

Thanks in Advance.

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[linux-lvm] Devices seen twice - how does LVM handle ?

[Markus Baertschi]

For reasons too complicate to explain here our SAN configuration is
broken. The effect is that linux sees the san disks twice. The originally
installed 'vgscan' was responding with a segfault to this situation.
After the installation of the latest release (1.0.7) vgscan is fine
and the volumegroup comes up.

However, does LVM handles this situation (disks visible twice) nicely ?
or should I continue to use my workaround (pull a fiber) to make sure
the disks are visible only once ?
- Are there risks of corruption ?
- What happens if the path the LVM happens to use breaks, but the other
is still up. Will LVM handle fail-over ?

Markus


--
  Markus Baertschi             Phone: ++41 (21) 807 1677
  Bas du Rossé 14b             Fax  : ++41 (21) 807 1678
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Re: [linux-lvm] Devices seen twice - how does LVM handle ?

[Luca Berra]

On Wed, Sep 10, 2003 at 03:04:25PM +0200, Markus Baertschi wrote:
>For reasons too complicate to explain here our SAN configuration is
>broken. The effect is that linux sees the san disks twice. The originally

>However, does LVM handles this situation (disks visible twice) nicely ?
does not seem broken to me if you have two hba.
lvm does not support multipath

>or should I continue to use my workaround (pull a fiber) to make sure
>the disks are visible only once ?
it is not a nice workaround.
>- Are there risks of corruption ?
i don't think so.
>- What happens if the path the LVM happens to use breaks, but the other
>is still up. Will LVM handle fail-over ?
lvm does not support multipath

at the moment your best chance is setting up an md multipath
and building your lvm over the md devices. be sure to use mdadm instead
of raidtools to manage the md.

i have this setup (2 hbas to same storage with lvm over md multipath) in
production, and it works fine.

another option could be if your hba driver handles multipath. i know
some qlogic boards do.

regards,
L.

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        Communication Media & Services S.r.l.
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Re: [linux-lvm] Devices seen twice - how does LVM handle ?

[Markus Baertschi]

Hi Luca,

On Wed, 10 Sep 2003 15:20:11 +0200, Luca Berra wrote:
>>However, does LVM handles this situation (disks visible twice) nicely ?
>does not seem broken to me if you have two hba.
>lvm does not support multipath

What does LVM do if it sees two paths (/dev/sdx1 entries) to the same
virtual disk ?

>>or should I continue to use my workaround (pull a fiber) to make sure
>>the disks are visible only once ?
>it is not a nice workaround.

Yes, but the only one I got to work in the timeframe I had to get the
machines up and running again.

>>- Are there risks of corruption ?
>i don't think so.
Why ?

>>- What happens if the path the LVM happens to use breaks, but the other
>>is still up. Will LVM handle fail-over ?
>lvm does not support multipath
OK.

>at the moment your best chance is setting up an md multipath
>and building your lvm over the md devices. be sure to use mdadm instead
>of raidtools to manage the md.

I'm not familiar with md. The volumes are already there and in production,
If possible I don't want to reconfigure (downtime...).

>i have this setup (2 hbas to same storage with lvm over md multipath) in
>production, and it works fine.
>another option could be if your hba driver handles multipath. i know
>some qlogic boards do.

I'm using qlogic boards with the qla2300 failover driver. This was working
perfectly until someone installed a blade center on unrelated ports
of the same storage box and changed the WWN of the box in the process.
The linux servers were rebooted three months (!) later for an unrelated
purpose and promptly failed to come up (vgscan segfault...). The failover
driver now thinks we have two storage boxes...

In the short run the only solution I had was to remove one path/fiber.

The real fix is to reconfigure the storage box, but this has to be done
when I can stop all servers connected to it (sunday 02:00 AM...).

In the meantime I installed the latest LVM and this fixes the segfault
problem. My main priority is stability right now and I prefer running
on one fiber than in a potentially dangerous configuration. The fiber
can be switched in a hurry (just plug in the other one), software needs
skills the local people don't have (I'm most of the time not on site).

Markus


--
  Markus Baertschi             Phone: ++41 (21) 807 1677
  Bas du Rossé 14b             Fax  : ++41 (21) 807 1678
  CH-1163, Etoy                Email: markus@markus.org
  Switzerland                  Homepage: www.markus.org

Re: [linux-lvm] Devices seen twice - how does LVM handle ?

[Rainer Krienke]

[-- Attachment #1: signed data --]
[-- Type: text/plain, Size: 2184 bytes --]

On Mittwoch, 10. September 2003 15:20, Luca Berra wrote:
> On Wed, Sep 10, 2003 at 03:04:25PM +0200, Markus Baertschi wrote:
> >For reasons too complicate to explain here our SAN configuration is
> >broken. The effect is that linux sees the san disks twice. The originally
> >
> >However, does LVM handles this situation (disks visible twice) nicely ?
>
> does not seem broken to me if you have two hba.
> lvm does not support multipath
>
> >or should I continue to use my workaround (pull a fiber) to make sure
> >the disks are visible only once ?
>
> it is not a nice workaround.
>
> >- Are there risks of corruption ?
>
> i don't think so.
>
> >- What happens if the path the LVM happens to use breaks, but the other
> >is still up. Will LVM handle fail-over ?
>
> lvm does not support multipath

It did not follow this discussion right from the start, so I might have missed 
something...

We are running 3 fileservers with raid devices attached by fibrechannel. Since 
each divice can be reached by 2 seperate io paths we are using a multipath 
setup based on the md interface (on top of the multipath md devices we 
finally run a software mirror (raid1)). This works just fine for our servers 
(running suse8.2) .  At the beginning we also had trouble with lvm1 since it 
was able to see the volume on different levels of abstraction: lvm scanned 
the real disks, it also scanned the md multipath metadevice and this probably 
led to the bad behaviour that whenever creating new logical volumes the 
complete configuration was invalid and so all data lost. 

We then changed to lvm2 since it has the ability to specify which devices to 
scan for lvm metadata and since then everything works fine.  

Rainer
-- 
---------------------------------------------------------------------------
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Universitaetsstrasse 1, 56070 Koblenz, Tel: +49 261287 -1312, Fax: -1001312
Mail: krienke@uni-koblenz.de, Web: http://www.uni-koblenz.de/~krienke
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Re: [linux-lvm] Devices seen twice - how does LVM handle ?

[Markus Baertschi]

Rainer,

I'm using fiber cards coming with a load-balancing driver and a SAN-Storage
box (IBM FastT 700) box. Unfortunately the storage-controlles got reconfigured
to accommodate more devices on other ports. This broke the configuration for me.
As it happens I found out a couple of months later when the new devices were
in production (We reboot out servers only when necessary). I can not fix the
configuration immediately and am trying to find out how to survive best
until I can fix the real problem it.

At the moment I'm pulling a fiber to have only one path as the installed LVM
version (0.9beta ?) just crashes if is sees two devices pointing to the 
same disk.
The most recent version (1.0.7) does not have this problem. It allows me
the keep both fibers connected. But I don't know how it handles this situation
and started this discussion to find out.

Markus


>It did not follow this discussion right from the start, so I might have mis=
>sed=20
>something...

>We are running 3 fileservers with raid devices attached by fibrechannel. Si=
>nce=20
>each divice can be reached by 2 seperate io paths we are using a multipath=
>=20
>setup based on the md interface (on top of the multipath md devices we=20
>finally run a software mirror (raid1)). This works just fine for our server=
>s=20
>(running suse8.2) .  At the beginning we also had trouble with lvm1 since i=
>t=20
>was able to see the volume on different levels of abstraction: lvm scanned=
>=20
>the real disks, it also scanned the md multipath metadevice and this probab=
>ly=20
>led to the bad behaviour that whenever creating new logical volumes the=20
>complete configuration was invalid and so all data lost.=20

>We then changed to lvm2 since it has the ability to specify which devices t=
>o=20
>scan for lvm metadata and since then everything works fine. =20

>Rainer



--
  Markus Baertschi             Phone: ++41 (21) 807 1677
  Bas du Rossé 14b             Fax  : ++41 (21) 807 1678
  CH-1163, Etoy                Email: markus@markus.org
  Switzerland                  Homepage: www.markus.org

Re: [linux-lvm] Can't install LVM 1.0.7 on Redhat Advanced Server 2.1 Please help.

[Luca Berra]

On Wed, Sep 10, 2003 at 04:48:40AM -0700, Gene wrote:
>I run the ./configure --with-kernel_dir=/boot    
>command, as I could not find a /usr/src/linux
>directory.. (There are no directories under /usr/src)
install the kernel-source rpm

>Does anyone know where the kernel_dir for RH AS is? I
>would think it's in the /boot folder.
/usr/src/linux, if you install the rpm.
but you will soon discover that lvm 1.0.7 patches won't apply cleanly
to the redhat patched kernel, and running a RHAS with a vanilla kernel
is kinda silly.
so, either you are prepared to fix the build by hand, or you wait for
RHAS 3.0

regards,
L.
no, i don't have a RHAS handy anymore, so cannot give you a proper
patch, besides i am not at all interested in lvm 1 since lvm 2
rocks.

-- 
Luca Berra -- bluca@comedia.it
        Communication Media & Services S.r.l.
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Re: [linux-lvm] Can't install LVM 1.0.7 on Redhat Advanced Server 2.1 Please help.

[Gene]

Thanks Luca, have you tried installing LVM2 on a RH AS
2.1 server?

Regards,
Gene
--- Luca Berra <bluca@comedia.it> wrote:
> On Wed, Sep 10, 2003 at 04:48:40AM -0700, Gene
> wrote:
> >I run the ./configure --with-kernel_dir=/boot    
> >command, as I could not find a /usr/src/linux
> >directory.. (There are no directories under
> /usr/src)
> install the kernel-source rpm
> 
> >Does anyone know where the kernel_dir for RH AS is?
> I
> >would think it's in the /boot folder.
> /usr/src/linux, if you install the rpm.
> but you will soon discover that lvm 1.0.7 patches
> won't apply cleanly
> to the redhat patched kernel, and running a RHAS
> with a vanilla kernel
> is kinda silly.
> so, either you are prepared to fix the build by
> hand, or you wait for
> RHAS 3.0
> 
> regards,
> L.
> no, i don't have a RHAS handy anymore, so cannot
> give you a proper
> patch, besides i am not at all interested in lvm 1
> since lvm 2
> rocks.
> 
> -- 
> Luca Berra -- bluca@comedia.it
>         Communication Media & Services S.r.l.
>  /"\
>  \ /     ASCII RIBBON CAMPAIGN
>   X        AGAINST HTML MAIL
>  / \
> 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at
http://tldp.org/HOWTO/LVM-HOWTO/


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