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Date:      Tue, 27 Mar 2012 18:45:57 +0100
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "Dennis Berger" <db@bsdsystems.de>, "andy thomas" <andy@time-domain.co.uk>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: ZFS read/write performance slows with time
Message-ID:  <E3832876FAD042819F852AFD051EDB72@multiplay.co.uk>
References:  <Pine.GSO.4.64.1203212341010.5175@mail.time-domain.co.uk><CAFqOu6hChpaHG1fUHcEVhza9urq%2BMf_RO71jAJzFUYZf25VH=w@mail.gmail.com><Pine.GSO.4.64.1203220014430.5175@mail.time-domain.co.uk> <9A143905-EAC1-4280-89F1-B7A742159610@bsdsystems.de>

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

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


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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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