On 24.07.2020 09:02, Daniel Berteaud wrote:
----- Le 23 Juil 20, à 23:59, Roland [email protected] a écrit :
i just had a look on that, too - i was backing up a VM i backed up this
afternoon,
and for my curiosity 1GB out of 15GB was marked dirty.
that looks a quite much for me for a mostly idle system, because there
was definitely only a little bit of change on the system within logfiles
in /var/log
so i wonder what marked all that blocks dirty....
i'm also suspecting atime changes...will keep an eye on that....
It was my daily fstrim in my case. Each time you trim, it'll dirty all the
blocks corresponding to unused space.
I've switched this to a weekly job so bacups can run most of the time
efficiently. Since then, dirty blocks went from ~15GB per VM on average to
something betwwen 800MB and 4GB, which is much closer to what I expect,
considering the 4MB granularity of the bitmap.
I'll check on my biggest VM (Zabbix server) but I expect similar results
Thanks Fabian and Jorge for pointing this out
Cheers
Daniel
would mounting the disk with discard help on this ? where it only trims
blocks that are actually discarded ? instead of touching the whole disk
with fstrim ?
Ronny
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