Mike wrote:
> I thought I'd test replacing a failed drive in a 4 drive raid 10 array on
> a CentOS 5.2 box before it goes online and before a drive really fails.
>
> I 'mdadm failed, removed', powered off, replaced drive, partitioned with
> sfdisk -d /dev/sda | sfdisk /dev/sdb, and finally 'mdadm add'ed'.
>
> Everything seems fine until I try to create a snapshot lv. (Creating a
> snapshot lv worked before I replaced the drive.) Here's what I'm seeing.
>
> # lvcreate -p r -s -L 8G -n home-snapshot /dev/vg0/homelv
> Couldn't find device with uuid
> 'yIIGF9-9f61-QPk8-q6q1-wn4D-iE1x-MJIMgi'.
> Couldn't find all physical volumes for volume group vg0.
> Volume group for uuid not found:
> I4Gf5TUB1M1TfHxZNg9cCkM1SbRo8cthCTTjVHBEHeCniUIQ03Ov4V1iOy2ciJwm
> Aborting. Failed to activate snapshot exception store.
>
> So then I try
>
> # pvdisplay
> --- Physical volume ---
> PV Name /dev/md3
> VG Name vg0
> PV Size 903.97 GB / not usable 3.00 MB
> Allocatable yes
> PE Size (KByte) 4096
> Total PE 231416
> Free PE 44536
> Allocated PE 186880
> PV UUID yIIGF9-9f61-QPk8-q6q1-wn4D-iE1x-MJIMgi
>
>
> Subsequent runs of pvdisplay eventually returns nothing. pvck /dev/md3
> seems to restore that but creating a snapshot volume still fails.
>
> It's as if the "PV stuff" is not on the new drive. I (probably
> incorrectly) assumed that just adding the drive back in to
> the raid array would take care of that.
>
> I've searched quite a bit but have not found any clues. Any one?
It would be interesting to see what the mdadm --detail /dev/mdX
says.
I see the VG is made out of 1 PV md3? What are md0,1,2 doing, I
can guess md0 is probably /boot, but what about 1 and 2?
It wouldn't hurt to give the sfdisk partition dumps for the
drives in question too.
-Ross
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