ZFS + dovecot

[Paul Macdonald]

Hi,

I'm starting to see reduced performance on a 2 disk SATA server with a 
mirrored 2TB pool running dovecot.

-Concurrent logged in users are ~ 1000.
-lucene plugin for indexing

minimal CPU and RAM usage (8GB, but will be increasing to 16GB for ZFS), 
only hit swap once in 2 years ( recently)

a few processes showing of zio->i under top.

I'm about to add a 460GB SSD as an L2ARC cache and hoping but note 
entirely sure that will help given that most people want to see new mail 
fast.

Does anyone have any performance tips for this workload?

TIA

Paul.

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Paul Macdonald
IFDNRG Ltd
Web and video hosting
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