topic LUN size for VM ... in Disk Enclosures

LUN size for VM ...

avamar11 — Wed, 23 Dec 2009 10:11:34 GMT

Hi All ,
I have a XP10000 ,which has 300 GB disk in RAID 5 (3D+1P) config .I looking for best practices to allocate LUNs to VMware ESX server .Should I allocate a single larger LUN (600 -700 GB ) to ESX ,which in tirn will be used to create 5 VMs ,though this way all IOPS will be services by the same RAID group OR should I give smaller LUNs from 2 or 3 RAID groups so as to distribute the IOPS between them ?
Kindly help .....

Re: LUN size for VM ...

Patrick Terlisten — Wed, 23 Dec 2009 10:41:49 GMT

Hello,

a LUN size between 500 GB an 1 TB is perfect. You should distribute them across the raid groups. VMFS filesystems with a high load shouldn't reside on the same raid group. VMs with a high load shouldn't reside in the same VMFS.

VMware recommend not more then 12 to 15 VMs per VMFS, not more then 10 ESX servers per LUN.

Best regards,
Patrick

Re: LUN size for VM ...

avamar11 — Wed, 23 Dec 2009 10:46:42 GMT

Can some elaborate more ,like effect on RAID 5 ( 3d+1P or 7D+1P) ...does any one also some info about Oracle VM ...