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Will adding a 15k SAS on a storage make speed difference ?

Hi,

We are having a new Dell ME4024SAN specced out and they have quoted for 10k SAS disks( 10x1.8 HDD 10k 512e SAS 12 2.5) and also they have added 2.62TB ssd for auto tiering.
If I go with 15k SAS dHardisk and will it make noticeable speed difference.
Any help much appreciated
Thanks

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ste5an

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Steve

Yes 15K disks are 'faster' that 10K disks but it depends what you;re going to do with them as it may not offer sufficient benefit to justify the cost.
On a RAID set with 10 disks you;'re going to get pretty good read/seek times from 10K disks anyway so you may only see a big difference with 15K disks if you are really hammering them and your RAID controller can make the most of the higher throughput.

Philip Elder

Current generation 10K SAS disks have an areal density so high that the extra spindle speed is essentially negated.

Are 15K 2.5" SAS drive even made anymore? Some manufacturers are dropping both 15K and 10K rust altogether.

Member_2_231077

Yes Philip, they still make 15K SFF disks.

Philip Elder

@andyalder Wow. The only place we're deploying rust today is in 60-bay and 102-bay JBODs for high density. Flash is still too expensive per Gigabyte though prices have been dropping quite a bit recently. I want to see those 32TB and 60TB+ flash drives manufacturers are promising!

kevinhsieh

15K drives have hit the end of the line, and there is no more R&D into them. Manufacturing is stopping. 10K drives have significantly greater capacity, so instead of looking at 15K drives, I would look to add more flash instead. Flash is killing 15K drives because flash is faster and cheaper than 15K when using recommended RAID levels appropriate for the disks (RAID 10 for 15K disks, RAID 5 for flash).