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@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Jeff Cleverley Sent: Friday, April 27, 2012 2:07 PM To: toasters@teaparty.net 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 _______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters