On Thu, 31 Dec 2015, Martin Frost wrote:

Any thoughts about what could be causing the slowness?

Run 'iostat -xe' in order to see if a disk is reporting errors or is abnormally slow.

Check to see if 'dedup' support is enabled for a zfs filesystem in your pool. For example:

% zfs get dedup tank
NAME  PROPERTY  VALUE          SOURCE
tank  dedup     off            default

If 'dedup' is enabled for the pool then you could suddenly run into a performance wall if you don't have enough RAM or dedicated L2ARC SSD device.

Bob
--
Bob Friesenhahn
[email protected], http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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