Just in case it is of general interest: ZFS mirroring was the culprit in our case

David Carter dpc22 at cam.ac.uk
Tue Nov 13 05:35:26 EST 2007

On Tue, 13 Nov 2007, Pascal Gienger wrote:

> Our latency problems went away like a miracle when we detached one half 
> of the mirror (so it is no more a mirror).
> Read-Rates are doubled (not per device, the total read rate!), latency 
> is cut off. No more latency problems.
> When attaching the volume again, resilvering puts the system to a halt -
> reads and writes do block for seconds (!).

Definitely of interest to those of us keeping one eye on ZFS. Thanks. Can 
someone else running ZFS confirm this behaviour?

David Carter                             Email: David.Carter at ucs.cam.ac.uk
University Computing Service,            Phone: (01223) 334502
New Museums Site, Pembroke Street,       Fax:   (01223) 334679
Cambridge UK. CB2 3QH.

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