Dne 06. 12. 20 v 22:01 Dennis Schridde napsal(a):
Hello!
A cached logical volume of mine cannot be activated anymore:
$ sudo vgchange -ay
device-mapper: reload ioctl on (253:6) failed: Invalid argument
0 logical volume(s) in volume group "vg_ernie" now active
dmesg logs:
device-mapper: cache: 253:6: unable to switch cache to write mode until
repaired.
device-mapper: cache: 253:6: switching cache to read-only mode
device-mapper: table: 253:6: cache: Unable to get write access to metadata,
please check/repair metadata.
device-mapper: ioctl: error adding target to table
The code in question seems to be: https://github.com/torvalds/linux/blob/v5.8/
drivers/md/dm-cache-target.c#L957-L964
Hence I set out to check the cache and, if it is clean, clear the needs_check
flag:
$ sudo lvchange -ay vg_ernie/lv_cache
Do you want to activate component LV in read-only mode? [y/n]: y
Allowing activation of component LV.
As said - by component activation you will get 'read-only' volume
thus you cannot do 'in-place' changes this way.
A bit puzzling is that the status of the needs_check flag appears to be
"unknown":
$ sudo lvs -a -o +lv_check_needed
LV VG Attr LSize Pool
Origin Data% Meta% Move Log Cpy%Sync Convert CheckNeeded
[lv_cache] vg_ernie CRi-a-C--- 232.88g
unknown
lv_system vg_ernie Cwi---C--- <1.82t [lv_cache]
[lv_system_corig]
unknown
[lv_system_corig] vg_ernie owi---C--- <1.82t
unknown
The live system I am running these commands from is a Fedora 33:
$ uname -a
Linux localhost-live 5.8.15-301.fc33.x86_64 #1 SMP Thu Oct 15 16:58:06 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux
$ sudo lvm version
LVM version: 2.03.10(2) (2020-08-09)
Library version: 1.02.173 (2020-08-09)
Driver version: 4.42.0
It seems you are using 'cvol' instead of 'cpool' solution which has been
evolving and you will need a newer lvm2 version.
If you want to using caching with the version of lvm2 you have - you will
need to use cpools (which are a bit faster anyway).
Regards
Zdenek
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