[linux-lvm] lvm and renaming of drives

[linux-lvm] lvm and renaming of drives

[Tim Randles]

very brief characteristics:
  large fileserver
  RHEL v3 AS (2.4.21-based kernel)

I have a large RAID device on an external SCSI chain.  Currently the 2
drives I've carved out of this device are /dev/sdj and /dev/sdk. 
Whenever I add a new drive to the internal SCSI chain on the machine the
external devices drive letters increment (1 new internal -> /dev/sdk and
/dev/sdl).  My question is, if I make /dev/sdk a physical volume what
happens when I add a new internal drive?  Will LVM recognize that
/dev/sdk is now /dev/sdl and activate the volume group/logical volumes
without any problem?  I assume this isn't a problem with DM and 2.6, but
I'm not there yet.

Thanks,
Tim


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Tim Randles
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Re: [linux-lvm] lvm and renaming of drives

[Erik Ohrnberger]

> very brief characteristics:
>   large fileserver
>   RHEL v3 AS (2.4.21-based kernel)
>
> I have a large RAID device on an external SCSI chain.  Currently the 2
> drives I've carved out of this device are /dev/sdj and /dev/sdk.
> Whenever I add a new drive to the internal SCSI chain on the machine the
> external devices drive letters increment (1 new internal -> /dev/sdk and
> /dev/sdl).  My question is, if I make /dev/sdk a physical volume what
> happens when I add a new internal drive?  Will LVM recognize that
> /dev/sdk is now /dev/sdl and activate the volume group/logical volumes
> without any problem?  I assume this isn't a problem with DM and 2.6, but
> I'm not there yet.
>
> Thanks,
> Tim
>
>
> --

<snip>

IMHO: I think you should do an volumn group export, add the drive, and
then a volumn group import.  I think that this is needed to make sure that
the LVM service finds the volume set again, after the device letters are
bumped.

Re: [linux-lvm] lvm and renaming of drives

[AJ Lewis]

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On Thu, Jul 08, 2004 at 10:54:46AM -0400, Erik Ohrnberger wrote:
> > very brief characteristics:
> >   large fileserver
> >   RHEL v3 AS (2.4.21-based kernel)
> >
> > I have a large RAID device on an external SCSI chain.  Currently the 2
> > drives I've carved out of this device are /dev/sdj and /dev/sdk.
> > Whenever I add a new drive to the internal SCSI chain on the machine the
> > external devices drive letters increment (1 new internal -> /dev/sdk and
> > /dev/sdl).  My question is, if I make /dev/sdk a physical volume what
> > happens when I add a new internal drive?  Will LVM recognize that
> > /dev/sdk is now /dev/sdl and activate the volume group/logical volumes
> > without any problem?  I assume this isn't a problem with DM and 2.6, but
> > I'm not there yet.
> >
> > Thanks,
> > Tim
> >
> >
> > --
> 
> <snip>
> 
> IMHO: I think you should do an volumn group export, add the drive, and
> then a volumn group import.  I think that this is needed to make sure that
> the LVM service finds the volume set again, after the device letters are
> bumped.

Actually, it is not necessary to do a vgexport.  You just need to run vgscan
when the drive letters change.

Regards,
-- 
AJ Lewis                                   Voice:  612-638-0500
Red Hat Inc.                               E-Mail: alewis@redhat.com
720 Washington Ave. SE, Suite 200
Minneapolis, MN 55414

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