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[linux-lvm] New disk; "Couldn't find uuid" after successful pvcreate&vgextend

Hi all,

I've been successfully running LVM2 (2.01.04) on Debian Sarge (2.6.8-2-686) for months.

As I've done many times before, I added a new disk yesterday. I successfully ran the following, both without error:

pvcreate -v /dev/hdc
vgextend -v mono_media /dev/hdc

As standard practice to make sure everything was ok, I then ran:

vgscan -v

At this point I got several references to "Couldn't find uuid..." repeated with the same uuid several times. At this point it seemed logical to back-out my changes, so I tried to run the following:

vgreduce -v mono_media /dev/hdc

Unfortunately this gave the same "Couldn't find uuid..." errors as 'vgscan'. As it seemed somewhat logical, I tried running the same 'pvcreate' command, again without error:

pvcreate -v /dev/hdc

After 'pvcreate' had finished, I was THEN able to run 'vgreduce' and restore my 'mono_media' VG to working order.

At this point I was a bit baffled, running 'lvmdiskscan' after the initial 'pvcreate' shows the disk as present, but if I reboot after just that first 'pvcreate' step and run 'lvmdisksacn' after the reboot, /dev/hdc isn't shown.

To rule-out a hardware problem I successfully ran 'mkfs.ext3 /dev/hdc' and was able to mount and navigate the volume without errors. Last night I also left 'badblocks -svw /dev/hdc' running which is almost complete and hasn't found any errors yet.

I will reply with full command output once 'badblocks' has finished, but I hope this brief synopsis makes sense.

Thanks everyone!

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