Hi List,
So, we just moved into a quieter time of the day, but maybe I just
stumbled onto something. I was trying to figure out if/how I could
throw more RAM at the problem. gluster docs says write behind is not a
cache unless flush-behind is on. So seems that is a way to throw ram to
it? I put performance.write-behind-window-size: 512MB and
performance.flush-behind: on and the whole system calmed down pretty
much immediately. could be just timing, though, will have to see
tomorrow during business hours whether the system stays at a reasonable
load.
so reporting back that this seems to have definitely had a significant
positive effect.
So far today I have not seen the load average climb over 13 with the
15minute average hovering around 7. cpus are still spiking from time to
time, but they are not staying maxed out all the time, and frequently I
am seeing brief periods of up to 80% idle. glusterfs process still
spiking up to 180% or so, but consistently running around 70%, and the
brick processes still spiking up to 70-80%, but consistently running
around 20%. Disk has only been above 50% in atop once so far today when
it spiked up to 92%, and still lots of RAM left over. So far nload even
seems indicates I could get away with a 100Mbit network connection.
Websites are snappy relative to what they were, still a bit sluggish on
the first page of any given site, but tolerable or close to. Apache
processes are opening and closing right away, instead of stacking up.
Overall, system is performing pretty much like I would expect it to
without gluster. I haven't played with any of the other settings yet,
just going to leave it like this for a day.
I have to admit I am a little bit suspicious. I have been arguing with
Gluster for a very long time, and I have never known it to play this
nice. kind feels like when your girl tells you she is "fine";
conversation has stopped, but you aren't really sure if it's done...
I will still test the other options you suggested tonight, though, this
is probably too good to be true.
Can't thank you enough for your input, Strahil, your help is truly
appreciated!
Best Regards,
Strahil Nikolov
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