jkennedy at qualcomm
Apr 27, 2012, 2:59 PM
Post #2 of 2
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RE: Mixing SAS/SATA DS4243 in the same stack.
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Technically you don't even want to mix them on the same cluster, let alone the same stack. Performance will be impacted.
When writes hit nvram it has to be flushed out to disk. If you have data being flushed to both sas and bsas you've throttled yourself to bsas speed. If one partner has bsas and the other has sas you have this issue in the event of a failover. It just gets more problematic from there.
Jeff Kennedy
Qualcomm, Incorporated
QCT Engineering Compute
858-651-6592
-----Original Message-----
From: toasters-bounces [at] teaparty [mailto:toasters-bounces [at] teaparty] On Behalf Of Jeff Cleverley
Sent: Friday, April 27, 2012 2:07 PM
To: toasters [at] teaparty
Subject: Mixing SAS/SATA DS4243 in the same stack.
Greetings,
I know that I can have a mixed stack of SAS and SATA shelves as long as all the drives in each shelf are the same type. I was wondering if anyone has seen any performance issues with this type of mix or if the preferred practice is to not mix them in a stack? I have some shelves to add and it would be very convenient if I put them all in the same cabinet. I just don't want to slow the SAS down with SATA/BSAS traffic on the same bus.
Thanks,
Jeff
--
Jeff Cleverley
Unix Systems Administrator
4380 Ziegler Road
Fort Collins, Colorado 80525
970-288-4611
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