From: Roy Sigurd Karlsbakk <roy@karlsbakk.net>
To: linux-lvm <linux-lvm@redhat.com>
Cc: Malin Bruland <malin.bruland@pm.me>
Subject: [linux-lvm] lvconvert --uncache takes hours
Date: Wed, 1 Mar 2023 23:44:00 +0100 (CET) [thread overview]
Message-ID: <2023967259.761825.1677710640334.JavaMail.zimbra@karlsbakk.net> (raw)
Hi all
Working with a friend's machine, it has lvmcache turned on with writeback. This has worked well, but now it's uncaching and it takes *hours*. The amount of cache was chosen to 100GB on an SSD not used for much else and the dataset that is being cached, is a RAID-6 set of 10x2TB with XFS on top. The system mainly works with file serving, but also has some VMs that benefit from the caching quite a bit. But then - I wonder - how can it spend hours emptying the cache like this? Most write caching I know of last only seconds or perhaps in really worst case scenarios, minutes. Since this is taking hours, it looks to me something should have been flushed ages ago.
Have I (or we) done something very stupid here or is this really how it's supposed to work?
Vennlig hilsen
roy
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Roy Sigurd Karlsbakk
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next reply other threads:[~2023-03-01 22:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 22:44 Roy Sigurd Karlsbakk [this message]
2023-03-01 22:55 ` [linux-lvm] lvconvert --uncache takes hours Demi Marie Obenour
2023-03-02 0:51 ` Roger Heflin
2023-03-02 8:33 ` Roy Sigurd Karlsbakk
2023-03-02 11:27 ` Roger Heflin
2023-03-02 17:34 ` Gionatan Danti
2023-03-02 18:33 ` Roger Heflin
2023-03-02 20:47 ` Gionatan Danti
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