[linux-lvm] Unable to un-cache logical volume when chunk size is over 1MiB

Zdenek Kabelac zkabelac at redhat.com
Fri Jun 22 20:07:11 UTC 2018

Dne 22.6.2018 v 20:13 Gionatan Danti napsal(a):
> Il 20-06-2018 12:15 Zdenek Kabelac ha scritto:
>> Hi
>> Aren't there any kernel write errors in your 'dmegs'.
>> LV becomes fragile if the associated devices with cache are having HW
>> issues (disk read/write errors)
>> Zdenek
> Is that true even when using a writethrough cache mode?

With writethrough - all writes are first committed on 'origin' disk - before 
they are ack back to writing apps - so cache can be through away anytime.

When cache will experience write error - it will become invalidate and will
need to be dropped - but this thing is not automated ATM - so admin
works is needed to handle this task.



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