I've also seen some anecdotal evidence to suggest that the real world performance between 15k and 10k is actually pretty close to even, so I'm not so sure you're going to get all that much of a difference out of the speed alone. The number of spindles, though, will certainly make a some difference. In general, the wider you can stripe, the better.
-Adam
On Fri, Sep 13, 2013 at 4:26 PM, Jeff Mohler speedtoys.racing@gmail.comwrote:
[insert the 'what is an op' argument]
Apps don't talk disk ops NFS doesn't equate to disk ops ... ...
Sent from my iPhone
On Sep 13, 2013, at 2:37 PM, Jordan Slingerland < Jordan.Slingerland@independenthealth.com> wrote:
Over simplified
120*200 = 24,000 maximum sustained ops (minus parity disks)
Or
80*140 = 11,200 maximum sustained ops (minus parity disks)
-----Original Message----- From: toasters-bounces@teaparty.net [mailto:
toasters-bounces@teaparty.net] On Behalf Of Ray Van Dolson
Sent: Friday, September 13, 2013 3:29 PM To: toasters@teaparty.net Subject: Expected performance difference between two configurations
Hi all;
Am trying to understand what sort of performance difference I might see
between two different configurations:
- IBM N6240 E21 (FAS3240C) w/ 120x600GB 15K 3.5" SAS and 512GB of
flash cache 2) IBM N6250 E26 w/ 80x900GB 10K 2.5" SAS and 512GB of flash cache.
Sorry, on the latter I don't know the equivalent FAS. Probably FAS3250C?
We have fewer spindles, but newer, beefier controllers.
Our workload is primarily VMware via NFS. Lotsa random reads and writes
(more on the read side) with I'd say the bulk of the IO requests in the 64KB+ range.
Will I regret going with fewer spindles?
Ray _______________________________________________ Toasters mailing list Toasters@teaparty.net http://www.teaparty.net/mailman/listinfo/toasters
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