On Wed, 16 Jan 2013, Peter Wood wrote:

Running zpool iostat -v (attachment zpool-IOStat.png) shows 1,22K write 
operations on the drives and 661 on the
ZIL. Compare to the other server (who is in way heavier use then this one) 
these numbers are extremely high.

Any idea how to debug any further?

Do some filesystems contain many snapshots? Do some filesystems use small zfs block sizes. Have the servers been used the same?

Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
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