Hello,
Hopefully someone can shed some light on what feels like a hopeless
situation. I've googled and tried a few things and got to a certain point,
but fear increasing the risk of losing data.
OK, first the original logical volume setup on raid5 which worked fine.
Here's the setup I followed:
mdadm --create /dev/md0 --level=5 --force --raid-devices=3 \
/dev/hdc1 /dev/sda1 /dev/sdb1
pvcreate /dev/md0
vgcreate lvm-raid /dev/md0
vgdisplay lvm-raid (and copy Free PE / Size for use in next command)
lvcreate -l 23845 lvm-raid -n lvm0
mkfs -t ext3 /dev/lvm-raid/lvm0
...and mount.
Everything worked perfectly, etc. Weeks later (present miserable week),
we then needed to add a disk to this RAID5 array.
So, unmounted the volume, and:
mdadm -S /dev/md0
vgchange -an lvm-raid
then created new raidtab file with extra device, then:
raidreconf -o /etc/raidtab -n /etc/raidtabnew -m /dev/md0
...reconf takes several days, but is successful...
...raid auto-rebuild currently running..
[this is where the problems start]
vgcfgrestore lvm-raid - errors with:
Couldn't find device with uuid 's7XzWQ-3J9O-yaYj-anJG-hhMn-mloL-mPkl1F'.
Couldn't find all physical volumes for volume group lvm-raid.
Restore failed.
To get uuid (this is possibly where I'm losing the plot due to ignorance):
pvdisplay /dev/md0
--- NEW Physical volume ---
PV Name /dev/md0
VG Name
PV Size 1.09 TB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID 6LGvgt-fLSV-xyfL-ItNc-YIiN-9Dhl-mYefsA
Then:
pvcreate -u s7XzWQ-3J9O-yaYj-anJG-hhMn-mloL-mPkl1F /dev/md0
Physical volume "/dev/md0" successfully created
vgcfgrestore lvm-raid
Restored volume group lvm-raid
lvdisplay
--- Logical volume ---
LV Name /dev/lvm-raid/lvm0
VG Name lvm-raid
LV UUID 000000-0000-0000-0000-0000-0000-000000
LV Write Access read/write
LV Status NOT available
LV Size 745.16 GB (this is supposed to be 1TB+)
Current LE 23845
Segments 1
Allocation normal
Read ahead sectors 1024
vgchange -ay
1 logical volume(s) in volume group "lvm-raid" now active
vgdisplay lvm-raid
--- Volume group ---
VG Name lvm-raid
System ID baksrv01138783727
Format lvm2
Metadata Areas 1
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 256
Cur LV 1
Open LV 0
Max PV 256
Cur PV 1
Act PV 1
VG Size 745.16 GB
PE Size 32.00 MB
Total PE 23845
Alloc PE / Size 23845 / 745.16 GB
Free PE / Size 0 / 0
VG UUID 6JaxpJ-MmTj-Ve9X-WiT6-THcg-SOjV-9uO8Mv
------------
Before proceeding to try and lvextend to use the extra 400GB (of new dev),
I decided to check if things were still happy, and tried to mount:
mount -a
dmesg:
VFS: Can't find ext3 filesystem on dev dm-0.
It's clear from above that my knowledge of lvm/2 is dangerous.
I have a gut feeling that either:
a) I've screwed the data, and/or,
b) I'm missing something glaringly obvious due to acute ignorance.
Any help would be appreciated.
Regards
Henka
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