[linux-lvm] lvm on a firewire harddisk

[linux-lvm] lvm on a firewire harddisk

[Herman Kuster]

Hi,

I've got the following problem:
I've a firewire harddisk (maxtor 5000xt), this disk works fine and is
available as /dev/sda in my system.
On this disk i have created one single pv (on /dev/sda, no partitioning)
I have put this pv into a vg, and in this volume group i have created one
lv.
All seems to be working fine until the time comes when my computer restarts.
On a boot somehow the lvm system forgets the pv on de firewire harddisk and
only shows (on a pvscan for example) the pv/vg/lv's on my normal harddisks
(/dev/hda and /dev/hdb). By the time the lvm system starts up i'm sure the
ieee1394 system is up and running (i modified my rc.sysinit file so the
ieee1394 system is startup before lvm).
Even when i am logged in as a user the lvm system still doesn't know the pv
on my firewire harddisk. But after I do a 'pvdisplay /dev/sda' the pv is
shown correctly and now the lvm system knows about the pv (it shows up in
pvscan and the vg/lv become available etc.). Does anyone know why my system
behaves as it does (btw i'm using a redhat 9.0 clean install), is this some
kind of bug in the lvm system, am i doing something wrong, please help.

Thanks,

Herman

Re: [linux-lvm] lvm on a firewire harddisk

[Herbert Poetzl]

On Sat, May 17, 2003 at 08:43:35AM +0200, Herman Kuster wrote:
> Hi,
> 
> I've got the following problem:
> I've a firewire harddisk (maxtor 5000xt), this disk works fine and is
> available as /dev/sda in my system.
> On this disk i have created one single pv (on /dev/sda, no partitioning)
> I have put this pv into a vg, and in this volume group i have created one
> lv.
> All seems to be working fine until the time comes when my computer restarts.
> On a boot somehow the lvm system forgets the pv on de firewire harddisk and
> only shows (on a pvscan for example) the pv/vg/lv's on my normal harddisks
> (/dev/hda and /dev/hdb). By the time the lvm system starts up i'm sure the
> ieee1394 system is up and running (i modified my rc.sysinit file so the
> ieee1394 system is startup before lvm).
> Even when i am logged in as a user the lvm system still doesn't know the pv
> on my firewire harddisk. But after I do a 'pvdisplay /dev/sda' the pv is
> shown correctly and now the lvm system knows about the pv (it shows up in
> pvscan and the vg/lv become available etc.). Does anyone know why my system
> behaves as it does (btw i'm using a redhat 9.0 clean install), is this some
> kind of bug in the lvm system, am i doing something wrong, please help.

My guess is, that either the lack of partitioning
prohibits the correct detection of your lvm
volume, or some drivers (eg. sd_mod) are not 
present at pvscan time, which get automagically
loaded when you explicitely access /dev/sda ...

HTH,
Herbert

> Thanks,
> 
> Herman
> 
> 
> 
> _______________________________________________
> 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/

RE: [linux-lvm] lvm on a firewire harddisk

[Herman Kuster]

Thanks for your reply, but i think i found the error in my system. My root
fs is also lvm based and to mount this my system uses a initrd. This initrd
doesn't have the ieee1394 modules so at that time the firewire harddisk is
not visible to the system. I've tried to make a new initrd image containing
both the lvm and ieee1394 modules, but this also doesn't work since the
ieee1394 modules take quite a long time to initialise. The ieee1394 modules
are loaded before the lvm, but the harddisk becomes available long after the
lvm modules have loaded. But since the mountpoint for the external harddisk
is not critical i now have made a 'quick-and-dirty' hack to the rc.sysinit:
just before the lvm lines (again, because the initrd also does this) i do a
pvdisplay /dev/sda, then all works well.

Bye,

Herman

-----Original Message-----
From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com] On
Behalf Of Herbert Poetzl
Sent: Saturday, May 17, 2003 11:00 AM
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] lvm on a firewire harddisk


On Sat, May 17, 2003 at 08:43:35AM +0200, Herman Kuster wrote:
> Hi,
> 
> I've got the following problem:
> I've a firewire harddisk (maxtor 5000xt), this disk works fine and is
> available as /dev/sda in my system.
> On this disk i have created one single pv (on /dev/sda, no partitioning)
> I have put this pv into a vg, and in this volume group i have created one
> lv.
> All seems to be working fine until the time comes when my computer
restarts.
> On a boot somehow the lvm system forgets the pv on de firewire harddisk
and
> only shows (on a pvscan for example) the pv/vg/lv's on my normal harddisks
> (/dev/hda and /dev/hdb). By the time the lvm system starts up i'm sure the
> ieee1394 system is up and running (i modified my rc.sysinit file so the
> ieee1394 system is startup before lvm).
> Even when i am logged in as a user the lvm system still doesn't know the
pv
> on my firewire harddisk. But after I do a 'pvdisplay /dev/sda' the pv is
> shown correctly and now the lvm system knows about the pv (it shows up in
> pvscan and the vg/lv become available etc.). Does anyone know why my
system
> behaves as it does (btw i'm using a redhat 9.0 clean install), is this
some
> kind of bug in the lvm system, am i doing something wrong, please help.

My guess is, that either the lack of partitioning
prohibits the correct detection of your lvm
volume, or some drivers (eg. sd_mod) are not 
present at pvscan time, which get automagically
loaded when you explicitely access /dev/sda ...

HTH,
Herbert

> Thanks,
> 
> Herman
> 
> 
> 
> _______________________________________________
> 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/

_______________________________________________
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/

Re: [linux-lvm] lvm on a firewire harddisk

[Herbert Poetzl]

On Sat, May 17, 2003 at 11:45:08AM +0200, Herman Kuster wrote:
> Thanks for your reply, but i think i found the error in my system. My root
> fs is also lvm based and to mount this my system uses a initrd. This initrd
> doesn't have the ieee1394 modules so at that time the firewire harddisk is
> not visible to the system. I've tried to make a new initrd image containing
> both the lvm and ieee1394 modules, but this also doesn't work since the
> ieee1394 modules take quite a long time to initialise. The ieee1394 modules
> are loaded before the lvm, but the harddisk becomes available long after the
> lvm modules have loaded. But since the mountpoint for the external harddisk
> is not critical i now have made a 'quick-and-dirty' hack to the rc.sysinit:
> just before the lvm lines (again, because the initrd also does this) i do a
> pvdisplay /dev/sda, then all works well.

in this case it could be an option to put the
ieee1394 and the sd_mod stuff into the kernel
(not using modules for those), which should
result in the device being present before any
initrd is mounted ...

best,
Herbert

> Bye,
> 
> Herman
> 
> -----Original Message-----
> From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com] On
> Behalf Of Herbert Poetzl
> Sent: Saturday, May 17, 2003 11:00 AM
> To: linux-lvm@sistina.com
> Subject: Re: [linux-lvm] lvm on a firewire harddisk
> 
> 
> On Sat, May 17, 2003 at 08:43:35AM +0200, Herman Kuster wrote:
> > Hi,
> > 
> > I've got the following problem:
> > I've a firewire harddisk (maxtor 5000xt), this disk works fine and is
> > available as /dev/sda in my system.
> > On this disk i have created one single pv (on /dev/sda, no partitioning)
> > I have put this pv into a vg, and in this volume group i have created one
> > lv.
> > All seems to be working fine until the time comes when my computer
> restarts.
> > On a boot somehow the lvm system forgets the pv on de firewire harddisk
> and
> > only shows (on a pvscan for example) the pv/vg/lv's on my normal harddisks
> > (/dev/hda and /dev/hdb). By the time the lvm system starts up i'm sure the
> > ieee1394 system is up and running (i modified my rc.sysinit file so the
> > ieee1394 system is startup before lvm).
> > Even when i am logged in as a user the lvm system still doesn't know the
> pv
> > on my firewire harddisk. But after I do a 'pvdisplay /dev/sda' the pv is
> > shown correctly and now the lvm system knows about the pv (it shows up in
> > pvscan and the vg/lv become available etc.). Does anyone know why my
> system
> > behaves as it does (btw i'm using a redhat 9.0 clean install), is this
> some
> > kind of bug in the lvm system, am i doing something wrong, please help.
> 
> My guess is, that either the lack of partitioning
> prohibits the correct detection of your lvm
> volume, or some drivers (eg. sd_mod) are not 
> present at pvscan time, which get automagically
> loaded when you explicitely access /dev/sda ...
> 
> HTH,
> Herbert
> 
> > Thanks,
> > 
> > Herman
> > 
> > 
> > 
> > _______________________________________________
> > 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/
> 
> _______________________________________________
> 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/
> 
> 
> 
> _______________________________________________
> 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/