Re: Removing lvmcache fails

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Dne 21. 09. 20 v 12:01 Roy Sigurd Karlsbakk napsal(a):
Dne 21. 09. 20 v 10:51 Roy Sigurd Karlsbakk napsal(a):
Hi all


However since you have 'writethrough' cache mode - it should be possible to
use  'lvconvert --uncache --force'

# lvconvert --uncache --force data/data
   Unknown feature in status: 8 2484/262144 128 819198/819200 57470386 35323243 19987362 9940326 0 0 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 819198/819200 57439248 35307947 19981793 9938992 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 819198/819200 57439248 35307947 19981793 9938992 0 0 1 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 cleaner 0 rw -
(et cetera et cetera ad infinitum)

But I'm somehow confused how you can have any dirty blocks in this case ??

So am I

lvm2 2.03.02 version was somewhat experimental release - so I've recommend
something newer  - which will also properly parse newer status output from
newer kernel dm-cache module.

Well, that's weird - debian is usually rather conservative on its packages in a stable release. Are you sure?

I also updated to a backported kernel 5.7 without any change.


Hi

Please can you open upstream BZ here:

https://bugzilla.redhat.com/enter_bug.cgi?product=LVM%20and%20device-mapper

List all the info - i.e. package versions (yep even .debs), kernel versions
lvmdump  archive.

I can probably easily 'hand-make' lvm2 metadata for you for 'vgcfgrestore' - but I'd like to track this case and create some reproducer for this issue so
we can handle case were the cache cannot be cleared.

Regards

Zdenek

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