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Re: [linux-lvm] HELP ME! (Couldn't find device with uuid'blah-blah-blah') (More detailed subject) Sorry

I fixed my problem, but I am not really sure how :).
I just kept trying stuff and finally after a reboot, it worked. I would like to know how to prevent such an event from happening again though.
lvm version
 LVM version:     2.00.08 (2003-11-14)
 Library version: 1.00.17-ioctl (2004-04-19)
 Driver version:  4.3.0

OS: Gentoo (2004.3)

My disk config is as follows:
3 regular disk partitions on first HDD: (120G IDE ATA133 HDD, Maxtor if that matters)
1) ext2 fs with my /boot => /dev/hda1
2) swap partition => /dev/hda2
3) xfs partition for / => /dev/hda3

The rest of /dev/hda is a phsical volume given to the LVM pool as /dev/hda4
Then, before the problem, I had two IDE HDDs (both Maxtor); 1 120G ATA133 and 1 60G ATA100. Both are completely given over to the LVM. I have one Volume Group (VolGrp) that has a number of partitions in it (My machine is a media server running the excellent MythTV software (mythtv.org)):

devfs on /dev type devfs (rw)

none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw)
none on /dev/shm type tmpfs (rw)
none on /proc/bus/usb type usbfs (rw)

/dev/hda1 on /boot type ext2 (rw,noatime)
/dev/hda3 on / type xfs (rw,noatime)

/dev/VolGrp/usr on /usr type reiserfs (rw)
/dev/VolGrp/home on /home type ext3 (rw)
/dev/VolGrp/roms on /mnt/roms type reiserfs (rw)
/dev/VolGrp/audio on /mnt/audio type xfs (rw)
/dev/VolGrp/backup on /mnt/backup type ext3 (rw)
/dev/VolGrp/video on /mnt/video type jfs (rw)
/dev/VolGrp/dvd on /mnt/video/dvd type jfs (rw)
/dev/VolGrp/videos on /mnt/video/videos type jfs (rw)
/dev/VolGrp/download on /mnt/download type reiserfs (rw)
/dev/VolGrp/win on /mnt/win type ext3 (rw)

(* I have massaged the output a little trying to make it easier to see the differences in the setup *)

The problem began when I added two new drives: 1 Maxtor 40GB ATA100 and 1 Seagate 17G ATA100. Both IDE.
I added the 40G drive with pvcreate/vgextend and doled out its space with lvextend commands and that seemed to go fine. I added the 17G drive with the same commands, but had not allocated its space yet when I rebooted the machine.

When I rebooted the machine, I got the uuid error for the same PV (which was for the final Seagate drive) repeatedly and none of my LVs would mount, including /usr. This was the biggest problem.

Now, I am planning to set aside a part of that 17G drive for a 'permanent' or 'traditional' /usr partition so I can at least run all of this stuff easily when I run into problems again.

I hope this is all of the information that you need. Please let me know what else I need to tell you.

Thanks for your help.

----- Original Message ----- From: "Alasdair G Kergon" <agk redhat com>
To: "LVM general discussion and development" <linux-lvm redhat com>
Sent: Sunday, April 17, 2005 7:07 PM
Subject: Re: [linux-lvm] HELP ME! (Couldn't find device with uuid'blah-blah-blah') (More detailed subject) Sorry

On Sat, Apr 16, 2005 at 09:06:39PM -0500, Ramzy Darwish wrote:
"Couldn't find device with uuid 'blah-blah-blah'
"Couldn't find all physical volumes for volume group VolGrp"

This is becoming an FAQ.

Start by telling which version of LVM2 (run 'lvm version') and
what distribution (some distributions have more trouble than
others with this) and detail your disk config: e.g. do you have raid,
any disk partitions?


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