[Bugs] [Bug 1309462] Upgrade from 3.7.6 to 3.7.8 causes massive drop in write performance. Fresh install of 3.7.8 also has low write performance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1309462



--- Comment #50 from Robert Rauch <robert.rauch at gns-systems.de> ---
(In reply to Ravishankar N from comment #49)
> (In reply to Robert Rauch from comment #48)
> > This issue also occured to us. We were able to regain the expected write
> > performance for our replica-2 volumes using the suggested workaround
> > (performance.write-behind off, data-self-heal off).
> > 
> > However, the problem remains for replica-3 arbiter-1 volumes and we
> > currently consider downgrading to 3.7.6. Do you have any further suggestions?
> 
> It shouldn't matter if it is an arbiter volume or not. I would suggest you
> upgrade to 3.7.9 which I think is going to be out in a couple of days.

It seems it does matter. I have also upgraded to 3.7.9 today and still see
sequential write performance on 1x(2+1) volume stuck at 40MB/s (tested with dd
and block size 1M).

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