Re: btrfs and load (sys)

[Roman Mamedov <rm@romanrm.ru>]

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On Wed, 23 Nov 2011 15:43:14 +0100
"krzf83@gmail.com " <krzf83@gmail.com> wrote:

> I've been using btrfs for two months now. Every day between 02:00 and
> 08:00 I rsync some 300GB data (milions of files) to btrfs device and
> then make snapshot. Next day i rsync again 300GG little changed (rsync
> "in place"). First days it worked perfectly. Then loadavg (sys load)
> started to rise. Now, after 60 days of rsync+shapshots sys load is so
> high that whole server becames quite unresponsive betweend 02:00 and
> 08:00. I never deleted any shapshot (yet) to its not rebalancing
> thing.

Hello,

I employ the same scenario, except that my rsync-(actually mirrordir-) destination btrfs device is only mounted briefly for the copy-then-snapshot operation, and unmounted during the rest of the time. Haven't noticed any performance problems yet, but even though I have about 2 TB of data there, it's probably not millions of files.

Have you tried unmounting the FS and then mounting it again, to see if it solves the performance problem (at least for a while)? Or just keeping it mostly unmounted, I suppose what you have is a partition with backups, so keeping it mostly offline is better reliability-wise.


-- 
With respect,
Roman

~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Stallman had a printer,
with code he could not see.
So he began to tinker,
and set the software free."

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