Hello everyone,
Some time ago I had a problem accessing a hardware snapshot of an LVM2
partition. The reason: different physical volumes having the same UUIDs.
The advice I was given was to use the "pvchange --uuid" command, but I'm
unable to use that command whitout making the PV unusable.
What happens is this: the PV is there, it is found, but becomes an
"unknown" device. pvdisplay and pvdisplay <device> disagree somewhat,
andit seems as if the old uuid is sticking around. vgscan or pvscan are of
no use.
Now I have no idea what else to try... BTW, I also failed having two
instances of LVM by setting LVM_SYSTEM_DIR: the second instance still
finds the PVs of the first even...even with the appropriate filters.
Any ideas how to continue here? For the time beeing the hardware snapshots
are not very useful...
Best,
Gilles
Example: initial pvdisplay:
--- Physical volume ---
PV Name /dev/sdb1
VG Name vg-test
PV Size 1020.00 MB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 255
Free PE 0
Allocated PE 255
PV UUID v3Oknf-6Rqa-Gh72-k0GO-c3I6-eoKS-odPWVr
# pvchange -v --uuid /dev/sdb1
Using physical volume(s) on command line
Finding volume group of physical volume "/dev/sdb1"
Archiving volume group "vg-test" metadata.
Updating physical volume "/dev/sdb1"
Creating volume group backup "/etc/lvm/backup/vg-test"
Physical volume "/dev/sdb1" changed
1 physical volume changed / 0 physical volumes not changed
#pvdisplay -v
Scanning for physical volume names
Couldn't find device with uuid 'GaTpFU-XgFz-HRH2-Mtyb-GI1f-4LN4-TOe8FK'.
--- Physical volume ---
PV Name unknown device
VG Name vg-test
PV Size 1020.00 MB / not usable 0
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 255
Free PE 0
Allocated PE 255
PV UUID GaTpFU-XgFz-HRH2-Mtyb-GI1f-4LN4-TOe8FK
or else:# pvdisplay -v /dev/sdb1
Using physical volume(s) on command line
Couldn't find device with uuid 'GaTpFU-XgFz-HRH2-Mtyb-GI1f-4LN4-TOe8FK'.
Couldn't find all physical volumes for volume group vg-test.
format_text: _vg_read failed to read VG vg-test
Couldn't find device with uuid 'GaTpFU-XgFz-HRH2-Mtyb-GI1f-4LN4-TOe8FK'.
Couldn't find all physical volumes for volume group vg-test.
format_text: _vg_read failed to read VG vg-test
--- NEW Physical volume ---
PV Name /dev/sdb1
VG Name
PV Size 1023.62 MB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID v3Oknf-6Rqa-Gh72-k0GO-c3I6-eoKS-odPWVr
# pvscan -v
Wiping cache of LVM-capable devices
Wiping internal cache
Walking through all physical volumes
Couldn't find device with uuid 'GaTpFU-XgFz-HRH2-Mtyb-GI1f-4LN4-TOe8FK'.
PV unknown device VG vg-test lvm2 [1020.00 MB / 0 free]
PV /dev/cciss/c0d0p6 VG data-vg lvm2 [8.00 GB / 0 free]
Total: 2 [9.00 GB] / in use: 2 [9.00 GB] / in no VG: 0 [0 ]
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