Dne 17.10.2012 22:21, Andres Toomsalu napsal(a):
Hi,
I'm aware that thin provisioning is not yet production ready (no metadata resize) - but is there a way to recover from thin pool failure when pool metadata was filled up?
I did setup 1.95T thin pool and after some usage pool metadata (128MB) was filling up to 99,08% - so all pool thin volumes went into read-only state.
Problem is that I cannot find a way in order to recover from this failure - eg also unable to delete/erase thin volumes and pool - only option seems to be full disk PV re-creation (eg OS re-install).
Is there a way to recover or delete thin pool/volumes - without erasing other (normal) LVs in this Volume Group?
For example dmsetup remove didn't help.
Some diagnostic output:
lvs -a -o+metadata_percent
dm_report_object: report function failed for field data_percent
--- REPEATABLE MSG ---
dm_report_object: report function failed for field data_percent
LV VG Attr LSize Pool Origin Data% Move Log Copy% Convert Meta%
pool VolGroupL0 twi-i-tz 1,95t 75,28 99,08
[pool_tdata] VolGroupL0 Twi-aot- 1,95t
[pool_tmeta] VolGroupL0 ewi-aot- 128,00m
root VolGroupL0 -wi-ao-- 10,00g
swap VolGroupL0 -wi-ao-- 16,00g
thin_backup VolGroupL0 Vwi-i-tz 700,00g pool
thin_storage VolGroupL0 Vwi---tz 900,00g pool
thin_storage-snapshot1 VolGroupL0 Vwi-i-tz 700,00g pool thin_storage
thin_storage-snapshot106 VolGroupL0 Vwi-i-tz 900,00g pool thin_storage
thin_storage-snapshot130 VolGroupL0 Vwi-i-tz 900,00g pool thin_storage
thin_storage-snapshot154 VolGroupL0 Vwi-i-tz 900,00g pool thin_storage
thin_storage-snapshot178 VolGroupL0 Vwi-i-tz 900,00g pool thin_storage
thin_storage-snapshot2 VolGroupL0 Vwi-i-tz 700,00g pool thin_storage
thin_storage-snapshot202 VolGroupL0 Vwi-i-tz 900,00g pool thin_storage
dmsetup table
VolGroupL0-thin_storage--snapshot2:
VolGroupL0-thin_storage--snapshot178:
VolGroupL0-swap: 0 33554432 linear 8:2 41945088
VolGroupL0-thin_storage--snapshot1:
VolGroupL0-root: 0 20971520 linear 8:2 20973568
VolGroupL0-thin_storage--snapshot130:
VolGroupL0-pool:
VolGroupL0-thin_backup:
VolGroupL0-thin_storage--snapshot106:
VolGroupL0-thin_storage--snapshot154:
VolGroupL0-pool-tpool: 0 4194304000 thin-pool 253:2 253:3 1024 0 0
VolGroupL0-pool_tdata: 0 2097152000 linear 8:2 75499520
VolGroupL0-pool_tdata: 2097152000 2097152000 linear 8:2 2172913664
VolGroupL0-pool_tmeta: 0 262144 linear 8:2 2172651520
VolGroupL0-thin_storage--snapshot202:
lvremove -f VolGroupL0/pool
Thin pool transaction_id=640, while expected: 643.
Unable to deactivate open VolGroupL0-pool_tdata (253:3)
Unable to deactivate open VolGroupL0-pool_tmeta (253:2)
Failed to deactivate VolGroupL0-pool-tpool
Failed to resume pool.
Failed to update thin pool pool.
Unfortunately there is no 'easy' advice for now yet - you hit current
Achilles heel of thinp support in lvm2 - we are thinking how to make recovery
usable for user - but it's not easy task since many things are making it very
complex - so it still needs some month of work.
As for now - you would need to download git source and disable certain
security check directly in the source to allow activation of damaged pool.
I guess I could provide you some extra patch that would allow you to active
thin pool in 'read-only' mode (but it's not yet ready for upstream).
Thus you should be able access 'some' data in this mode with a big note -
since devices would be in read-only mode - you cannot even run fsck on such
partition - and since you have transaction_id mismatch - it would need
some analysis to see what actually happened - are you able to provide me
archive files for the history of your recent lvm commands -
it should not allow you to have difference bigger then 1 - so there is
probably some bug (unless you are using some old version of lvm2 with initial
thinp support)
Zdenek
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