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Recommendations for Vdisk and volume configuration on HP P2000 G3 iSCSI for VMware ESXi 5.1

Posted on 2014-12-03
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Hello,

We currently have 1 Vdisk configured on an HP P2000 G3 iSCSI MSA Dual Controller SAN used by 2 x VMware ESXi hosts.

The existing Vdisk (not created by us) is a RAID 5 array made up of 7 x 300GB 15K drives with 1 spare giving 1.8TB of space

There are 3 volumes of 500GB mapped to the VMware hosts, leaving 300GB of free space. Would this free space have been left for a reason?

We now need to add more space and an additional VMware physical host to increase the amount of VMs we can create.

We have added 16 disks to the SAN enclosure, 8 x 300GB 15K and 8 x 600GB 10K SFF drives

The plan is to create 2 additional Vdisks:

RAID 10 with 8 x 300GB 15K drives giving 1.2 TB of space for VMs requiring higher storage performance

RAID 5 with 7 x 600GB 10K drives giving 3.6TB of space, with the remaining 1 x 600GB drive assigned as a global spare - this would be used for general file storage

We are stuck at the point of creating the volumes under each new Vdisk.

Should we create one big volume or divide into chunks?
Should any free space be left like on our original Vdisk?

Many thanks in advance for your help and suggestions

Original Vdisk
Volumes
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Question by:neilfreeman
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40479191
The only reason I can see to leave space, is so the LUN can be expanded in the future, if required on the datastore.

It depends how you want to allocate all the space, in the vdisk, usually we allocate it all, and leave none spare.

we like to split into chunks, between 500-800GB, unless we need supersize LUNs for large VMs.
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Author Comment

by:neilfreeman
ID: 40479300
Many thanks for your response

Regarding the LUNs am I OK to assign more than one VM to each one (size permitting)? I know it is probably difficult to give an exact specification without seeing the environment but as a general rule what would you say the maximum is?

Thanks again for your help

Neil
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LVL 125
ID: 40479318
Yes, we generally have between 5 - 10 VMs per LUN

but try not to put the same type of VM per LUN

e.g. do not put two SQL servers, or two Domain Cointrollers, Two terminal servers etc
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Author Closing Comment

by:neilfreeman
ID: 40479336
Thank you very much, that was exactly what we were looking for!
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