Date: Thu, 19 Jan 2017 08:56:05 +0100 From: Tobias Oberstein <tobias.oberstein@gmail.com> To: freebsd-fs@freebsd.org Subject: stuck on low scrub performance Message-ID: <b0dc09d8-3579-f7c0-f72a-3e2ce798f443@gmail.com>
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Hi,
I've got a 146TB RAID-Z2 magnetic platter pool which I am scrubbing, but
performance is very poor:
pool: tank
state: ONLINE
scan: scrub in progress since Tue Jan 17 11:13:29 2017
5.02T scanned out of 89.4T at 32.2M/s, (scan is slow, no
estimated time)
0 repaired, 5.61% done
I've already tried modifying various knobs, with no success (I changed
oids while the scrub is running, without restarting - does that take
effect?).
I've tried to collect as much info as possible using this script
https://gist.github.com/oberstet/c66baf777ea77ae843b64271df7420a3
with this output
https://gist.github.com/oberstet/a8e12227486ebeb1e85f6f56b880ce7d
---
My expectation from the general performance of this array would be
scrubbing with 500MB/s (10x more) - this is what we regularily see on
this array when it goes to the magnetic platters on sequential read loads.
Any helps would be greatly appreciated, as at that speed, the scrubbing
takes weeks =(
Cheers,
/Tobias
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