From: Jeff Cleverley <jeff.cleverley@avagotech.com>
To: toasters@teaparty.net
Sent: Wednesday, February 27, 2013 8:33 PM
Subject: DS2246 shelves and drives questions.
Greetings,
We will be upgrading an existing 6080 cluster to a 6280 cluster. We
also have a 6080 cluster we'll be adding disks to also. Both clusters
are 7-mode. We'll probably end up at 8.1 on both clusters. My 2
questions stem from the disks and shelves being proposed for the
upgrades (ds2246 with 450g SAS).
1. We currently have DS4243 shelves with 600gig SAS. I know I can't
mix these in the same stack because of the 3/6gb connection
differences. I have a free port on each SAS adapter in our 6080s.
Can I put the 6gb shelves on the same adapter as long as they are on
their own stack? I'm guessing it may not be a best practice, but we
don't have any slots free in the 6080 for more cards.
2. I found a white paper that states the 10K drive performance can be
up to 20% slower than the 15K SAS drives for random reads. That seems
like a pretty big
performance it. It also says mixing the disks in
aggregates is not recommended. Other than the smaller footprint and
better density, I'm not seeing an advantage over using 600g SAS in the
DS4243 shelves. Are there any advantages other than the faster SAS
backend to warrant going to these shelves in our environment?
Thanks,
Jeff
--
Jeff Cleverley
Unix Systems Administrator
4380 Ziegler Road
Fort Collins, Colorado 80525
970-288-4611
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