10k and 15k hard disks

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serverx

Member
Jul 3, 2014
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hello im going to prepare a new san with 12 hdd 600gb 15k in raid10 (controller dell perc h710), i would like to use also 2 hdd 600gb 10k as hot spare, my question is, if i will mix 15k and 10k hdd the controller will slowdown the all the hdd at 10k or the speed will be not decreased while the 10k are just hotspare?
thanks
 

Biren78

Active Member
Jan 16, 2013
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Use a 15k drive as your hotspare.

Speeds will not decrease but if a drive fails and the hotspare becomes used in the array it will have a negative performance impact. To remove the 10k you would need to force 1-2 full raid operations (ie add new drive, remove old drive from array, rebuild using new drive.)
 

gea

Well-Known Member
Dec 31, 2010
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Have you thought about SSDs?

Such a config build from 6 x Raid-10 is usually used if you need many IOPS. They can offer around 1000 IOPS. This is a fraction of the IOPS that a single SSD can offer. Single Enterprise SSDs with enough overprovisioning can offer several thousand IOPS continously under load.

I would consider a pool from several Enterprise SSDs like Intel S3500 or the write optimized S3700 as an alternative. You can think about a Raid-6 or Raid-Z2 when using ZFS in such a case to use less disks for redundancy.