On Tue, Aug 4, 2009 at 7:33 AM, Roch Bourbonnais <roch.bourbonn...@sun.com>wrote:
> > Le 4 août 09 à 13:42, Joseph L. Casale a écrit : > > does anybody have some numbers on speed on sata vs 15k sas? >>> >> >> The next chance I get, I will do a comparison. >> >> Is it really a big difference? >>> >> >> I noticed a huge improvement when I moved a virtualized pool >> off a series of 7200 RPM SATA discs to even 10k SAS drives. >> Night and day... >> >> > If by 'huge' you mean much more than 10K/7.2K in the data path with > otherwise same number of spindles, then > that has got to be because of something not specified here. > > -r No it doesn't. The response time on 10k drives is night and day better than 7.2k drives. VMware workloads look exactly like DB workloads. Faster spindles=better response time=virtualized platform being much happier. Not to mention, in my experience, the 7.2k drives fall off a cliff when you overwork them. 10k/15k drives tend to have a more linear degradation in performance. --Tim
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