linux-lvm.redhat.com archive mirror
 help / color / mirror / Atom feed
From: Zdenek Kabelac <zkabelac@redhat.com>
To: LVM general discussion and development <linux-lvm@redhat.com>,
	Roy Sigurd Karlsbakk <roy@karlsbakk.net>
Subject: Re: [linux-lvm] Removing lvmcache fails
Date: Mon, 21 Sep 2020 14:53:39 +0200	[thread overview]
Message-ID: <c6499a9a-1e69-9502-85b5-b62bb5a4771b@redhat.com> (raw)
In-Reply-To: <2072153092.4261300.1600682482754.JavaMail.zimbra@karlsbakk.net>

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

  reply	other threads:[~2020-09-21 12:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21  8:51 Roy Sigurd Karlsbakk
2020-09-21  9:47 ` Zdenek Kabelac
2020-09-21 10:01   ` Roy Sigurd Karlsbakk
2020-09-21 12:53     ` Zdenek Kabelac [this message]
2020-09-21 13:24       ` Roy Sigurd Karlsbakk

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=c6499a9a-1e69-9502-85b5-b62bb5a4771b@redhat.com \
    --to=zkabelac@redhat.com \
    --cc=linux-lvm@redhat.com \
    --cc=roy@karlsbakk.net \
    --subject='Re: [linux-lvm] Removing lvmcache fails' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).