[linux-lvm] Removing lvmcache fails

[Roy Sigurd Karlsbakk]

Hi all

I have an ssd hooked up to my system to do some caching of the raid-6 array. Now, that SSD isn't very new and has started developing some smart errors, so I thought I'd just remove it and find a nice recycle bin for it. However, this fails.

This is Debian Buster (latest) with kernel 5.4 and lvm 2.03.02(2)

Any idea how to get rid of this?

# lvconvert --uncache data/data
  Unknown feature in status: 8 2488/262144 128 819192/819200 57263288 35277148 19955332 9916661 0 1 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 smq 0 rw -
  Flushing 1 blocks for cache data/data.
  Unknown feature in status: 8 2484/262144 128 819192/819200 56391295 33200598 19684834 6317925 0 0 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 cleaner 0 rw -
  Flushing 1 blocks for cache data/data.
  Unknown feature in status: 8 2484/262144 128 819192/819200 56391295 33200598 19684835 6317925 0 0 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 cleaner 0 rw -
  Flushing 1 blocks for cache data/data.
  Unknown feature in status: 8 2484/262144 128 819192/819200 56391295 33200598 19684835 6317925 0 0 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 cleaner 0 rw -
  Flushing 1 blocks for cache data/data.
  Unknown feature in status: 8 2484/262144 128 819192/819200 56391295 33200598 19684835 6317925 0 0 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 
(and so on)

# lvs -o+cache_mode data/data
  Unknown feature in status: 8 2484/262144 128 819195/819200 57263401 35277148 19955449 9916671 0 3 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 smq 0 rw -
  LV   VG   Attr       LSize  Pool     Origin       Data%  Meta%  Move Log Cpy%Sync Convert CacheMode
  data data Cwi-aoC--- 13,67t [_cache] [data_corig] 99,99  0,95            0,01             writethrough

Vennlig hilsen

roy
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Roy Sigurd Karlsbakk
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