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* [linux-lvm] lvconvert --uncache takes hours
@ 2023-03-01 22:44 Roy Sigurd Karlsbakk
  2023-03-01 22:55 ` Demi Marie Obenour
  2023-03-02  0:51 ` Roger Heflin
  0 siblings, 2 replies; 8+ messages in thread
From: Roy Sigurd Karlsbakk @ 2023-03-01 22:44 UTC (permalink / raw)
  To: linux-lvm; +Cc: Malin Bruland

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 Sigurd Karlsbakk
(+47) 98013356
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med xenotyp etymologi. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.

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^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2023-03-02 20:48 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-03-01 22:44 [linux-lvm] lvconvert --uncache takes hours Roy Sigurd Karlsbakk
2023-03-01 22:55 ` 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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