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SAS Hard Drives 15,000 vs 10,000 RPM

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SAS Hard Drives 15,000 vs 10,000 RPM - 8.Jan.2009 10:21:32 AM   
desibacha

 

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Hello. i am installing ex2007 and i am specing out a server. How many of you chosen a 10,000 prm drive vs the 15,000 rpm drive?  We have about 1,000 users which 3/4 are heavy users and about 200 gb database. Any feedback would be great. thanks
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RE: SAS Hard Drives 15,000 vs 10,000 RPM - 8.Jan.2009 10:29:36 AM   
mark@mvps.org

 

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The obvious answer is the 15k drives because of the increase in IOPS you can get out of it. The possible alternative is your budget and how many disks you're planning.

Your vendor will tell you how many IOPS you get from the disk. You know how many disks you're going to need to meet the IOPS requirements of the users (that part is simple maths). You do that calculation for both disk types. You then compare the total cost. You buy what you can afford.

I'd always go for the 15k drives as they're newer and way less likely to run into shortage problems in a couple of years - remote as that might be.

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RE: SAS Hard Drives 15,000 vs 10,000 RPM - 11.Feb.2009 10:47:14 AM   
desibacha

 

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Thanks

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RE: SAS Hard Drives 15,000 vs 10,000 RPM - 12.Feb.2009 2:51:39 AM   
ahanbali

 

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you may calculate your disks needs based on this equaition
Total IOPS = #Disks x IOPS/Disk x RAID Penalty factor
while the RAID Penalty factors are:
RAID 5 is 0.57 and 0.8 for RAID 1 (or 0+1).
and the IOPS per disk speed:
10K RPM disk will do 130 IOPS, and a 15K RPM will achieve 180 IOPS.

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Abdelrahim I. Al-Hanbali
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