ZFS read/write performance slows with time

Steven Hartland killing at multiplay.co.uk
Tue Mar 27 17:46:46 UTC 2012

8.2 is effected by overflow bugs which can cause behaviour like this.

----- Original Message ----- 
From: "Dennis Berger" <db at bsdsystems.de>
To: "andy thomas" <andy at time-domain.co.uk>
Cc: <freebsd-fs at freebsd.org>
Sent: Tuesday, March 27, 2012 5:18 PM
Subject: Re: ZFS read/write performance slows with time

Hash: SHA1

We have seen the same issue on freenas 8.2 which is a patched freebsd 8.2.
Performance dropped from somewhat 700MByte/sec to 2MByte/sec on the main NAS system.
I couldn't find the problem in time so we rebooted. Uptime was around 150 days.
After reboot everything was back to normal.
We will reinstall the system with a stock freebsd 9 as no GUI is needed anymore.

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