RAID10 question

Lanz · 15 Oct 2014 at 15:11

I have 16 drives in a R720, what is the best practice when it comes to setting up one big RAID10 vdisk.

Do I have 2 Disks per Span (8 spans) - This is default on the controller.
or
8 disks per span (2 spans)

Cheers

leigh_boy · 15 Oct 2014 at 15:16

depends how you want it really all data in 2 places or multiple?
if this was for esxi i would do it as 2spans depending on how many vms.

Lanz · 15 Oct 2014 at 15:17

This is for a VDI datastore.

leigh_boy · 15 Oct 2014 at 15:19

how do you work?
production and test ? just production? how many vms?

Lanz · 15 Oct 2014 at 15:22

At the moment all our VDI hosts are Raid6, they have been for a long time, so I'm configuring a test host using RAID10 to see if there's any real performance gain. Have about about 50 VM's per host (it runs out of memory before it runs out of cpu or IO)

leigh_boy · 15 Oct 2014 at 15:29

the more disk the better io, its then preference as to if you want to split it down, i would keep it as 2.

Lanz · 15 Oct 2014 at 15:36

Further reading would suggest I leave it as 2, as that's the norm for RAID10, i.e. stripped sets of mirrored disks.

I'll give it a go... cheers