Messages in this thread | | | Subject | Re: 3ware disk latency? | From | Alan Cox <> | Date | Wed, 26 Jul 2006 21:37:29 +0100 |
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Ar Mer, 2006-07-26 am 09:52 -0700, ysgrifennodd dean gaudet: > On Mon, 10 Jul 2006, Jan Kasprzak wrote: > > > Does anybody experience the similar latency problems with > > 3ware 95xx controllers? Thanks, > > i think the 95xx is really bad at sharing its cache fairly amongst > multiple devices... i have a 9550sx-8lp with 3 exported units: a raid1, a > raid10 and a jbod. i was zeroing the jbod with dd and it absolutely > destroyed the latency of the other two units.
Even on the older 3ware I found it neccessary to bump up the queue sizes for the 3ware. There's a thread from about 6 months ago (maybe a bit more) with Jeff Merkey included where it made a huge difference to his performance playing with the parameters. Might be worth a scan through the archive.
Alan
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