Hi list,

We have a couple of old SR1521, and they perform really bad when rebuilding, 
I/O goes down dramatically. And with old disks this happens more than usual. So 
to avoid this we have exported all disks with JBOD, and use ZFS filesystem 
adding all disks to a ZFS pool. And when a disk fails performance doesn't go 
down so much. Also when all disks in the pool are good, performance is actually 
much better (at least 50 %!). Processing power is of course needed by ZFS, so 
you will need a server capable to handle this extra overhead  (the server on 
which you attach the SR1521).

We use
- latest free firmware for SR1521
- Ubuntu 10.04 LTS with ZFS and aoe driver 
(https://launchpad.net/~zfs-native/+archive/stable/)

/Lars


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Virtualization & Cloud Management Using Capacity Planning
Cloud computing makes use of virtualization - but cloud computing 
also focuses on allowing computing to be delivered as a service.
http://www.accelacomm.com/jaw/sfnl/114/51521223/
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