[linux-lvm] Recovering from lvm thin metadata exhaustion
Dean Hamstead
dean at bytefoundry.com.au
Sun Jul 8 21:36:28 UTC 2018
Hi All,
I hope someone with very high LVM wizardy can save me from a pickle...
Ok so this happened:
====
Jul 3 13:16:24 saito kernel: [131695.910332] device-mapper: space map
metadata: unable to allocate new metadata b
lock
Jul 3 13:16:24 saito kernel: [131695.910762] device-mapper: thin:
253:4: metadata operation 'dm_thin_remove_range' failed: error = -28
Jul 3 13:16:24 saito kernel: [131695.911019] device-mapper: thin:
253:4: aborting current metadata transaction
Jul 3 13:16:24 saito kernel: [131695.974977] device-mapper: thin:
253:4: switching pool to read-only mode
Jul 3 13:16:33 saito kernel: [131705.274889] device-mapper: thin:
dm_thin_get_highest_mapped_block returned -61
Jul 3 13:16:43 saito kernel: [131715.351896] device-mapper: thin:
dm_thin_get_highest_mapped_block returned -61
Jul 3 13:16:53 saito kernel: [131725.446482] device-mapper: thin:
dm_thin_get_highest_mapped_block returned -61
====
And sure enough
====
root at saito:/var/log# lvs -a
Failed to parse thin params: Error.
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert
data pve twi-cotzM- 500.00g 37.28 96.39
[data_tdata] pve Twi-ao---- 500.00g
[data_tmeta] pve ewi-ao---- 100.00m
[lvol0_pmspare] pve ewi------- 100.00m
root pve -wi-ao---- 93.13g
swap pve -wi-ao---- 14.90g
vm-100-disk-1 pve Vwi-XXtzX- 200.00g data
vm-100-disk-2 pve Vwi-a-tz-- 100.00g data 23.25
====
So i added more:
====
root at saito:/var/log# lvextend --poolmetadatasize +1G pve/data
Size of logical volume pve/data_tmeta changed from 100.00 MiB (25
extents) to 1.10 GiB (281 extents).
Logical volume pve/data_tmeta successfully resized.
====
killed off the stuck qemu processess then
====
root at saito:/var/log# lvchange -an -v /dev/pve/vm-100-disk-1
Deactivating logical volume pve/vm-100-disk-1.
Removing pve-vm--100--disk--1 (253:6)
root at saito:/var/log# lvchange -an -v /dev/pve/vm-100-disk-2
Deactivating logical volume pve/vm-100-disk-2.
Removing pve-vm--100--disk--2 (253:7)
root at saito:/var/log# lvchange -an -v /dev/pve/data
Deactivating logical volume pve/data.
Not monitoring pve/data with libdevmapper-event-lvm2thin.so
Removing pve-data (253:5)
Removing pve-data-tpool (253:4)
Executing: /usr/sbin/thin_check -q --clear-needs-check-flag
/dev/mapper/pve-data_tmeta
/usr/sbin/thin_check failed: 1
WARNING: Integrity check of metadata for pool pve/data failed.
Removing pve-data_tdata (253:3)
Removing pve-data_tmeta (253:2)
====
then do repair
====
root at saito:/var/log# lvconvert --repair pve/data
Using default stripesize 64.00 KiB.
WARNING: recovery of pools without pool metadata spare LV is not
automated.
WARNING: If everything works, remove pve/data_meta0 volume.
WARNING: Use pvmove command to move pve/data_tmeta on the best
fitting PV.
====
looks good i guess, bring it back up and check metadata state:
====
root at saito:/var/log# lvchange -ay -v /dev/pve/data
Activating logical volume pve/data exclusively.
activation/volume_list configuration setting not defined: Checking
only host tags for pve/data.
Creating pve-data_tmeta
Loading pve-data_tmeta table (253:2)
Resuming pve-data_tmeta (253:2)
Creating pve-data_tdata
Loading pve-data_tdata table (253:3)
Resuming pve-data_tdata (253:3)
Executing: /usr/sbin/thin_check -q --clear-needs-check-flag
/dev/mapper/pve-data_tmeta
Creating pve-data-tpool
Loading pve-data-tpool table (253:4)
Resuming pve-data-tpool (253:4)
Creating pve-data
Loading pve-data table (253:5)
Resuming pve-data (253:5)
Monitoring pve/data
root at saito:/var/log# lvs -a
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert
data pve twi-aotz-- 500.00g 4.65 1.19
data_meta0 pve -wi------- 1.15g
[data_tdata] pve Twi-ao---- 500.00g
[data_tmeta] pve ewi-ao---- 1.15g
root pve -wi-ao---- 93.13g
swap pve -wi-ao---- 14.90g
vm-100-disk-1 pve Vwi---tz-- 200.00g data
vm-100-disk-2 pve Vwi---tz-- 100.00g data
root at saito:/var/log# pvdisplay
====
good news for disk 2...
====
root at saito:/var/log# lvchange -ay -v /dev/pve/vm-100-disk-2
Activating logical volume pve/vm-100-disk-2 exclusively.
activation/volume_list configuration setting not defined: Checking
only host tags for pve/vm-100-disk-2.
Loading pve-data_tdata table (253:3)
Suppressed pve-data_tdata (253:3) identical table reload.
Loading pve-data_tmeta table (253:2)
Suppressed pve-data_tmeta (253:2) identical table reload.
Loading pve-data-tpool table (253:4)
Suppressed pve-data-tpool (253:4) identical table reload.
Creating pve-vm--100--disk--2
Loading pve-vm--100--disk--2 table (253:6)
Resuming pve-vm--100--disk--2 (253:6)
pve/data already monitored.
====
now bad news for disk 1...
====
root at saito:/var/log# lvchange -ay -v /dev/pve/vm-100-disk-1
Activating logical volume pve/vm-100-disk-1 exclusively.
activation/volume_list configuration setting not defined: Checking
only host tags for pve/vm-100-disk-1.
Loading pve-data_tdata table (253:3)
Suppressed pve-data_tdata (253:3) identical table reload.
Loading pve-data_tmeta table (253:2)
Suppressed pve-data_tmeta (253:2) identical table reload.
Loading pve-data-tpool table (253:4)
Suppressed pve-data-tpool (253:4) identical table reload.
Creating pve-vm--100--disk--1
Loading pve-vm--100--disk--1 table (253:7)
device-mapper: reload ioctl on (253:7) failed: No data available
Removing pve-vm--100--disk--1 (253:7)
====
and from dmesg regarding disk one:
====
[481216.385943] device-mapper: table: 253:7: thin: Couldn't open thin
internal device
[481216.386433] device-mapper: ioctl: error adding target to table
====
I think i may be in serious trouble
====
root at saito:/var/log# thin_dump /dev/pve/data_meta0 > /tmp/foo.txt
root at saito:/var/log# grep superblock /tmp/foo.txt
<superblock uuid="" time="0" transaction="6" data_block_size="128"
nr_data_blocks="8192000">
</superblock>
====
any thoughts on how to bring this disk back? I would be delighted for
someone to be able to point me at how this disk might be saved?
Kind Regards
Dean Hamstead
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