Hi. We have several new SQL Servers installed on VMs. My question relates only to the VM configuration, not how the hosts are configured to use the SAN.
For local storage, I would normally request several mirrors or raid 10 arrays and have only one partition on each. The result is one LUN per physical mirror or raid array. Each LUN is then dedicated to a specific IO type (e.g., system dbs, backup, user data, user tran log, tempdb data).
On our VMs, I make the same request for drives. However, I sometimes see only one disk (virtual) in disk manager with multiple partitions - not several virtual disks with one partition each. I know the same SAN disks end up being used either way, but should I insist on one partition per disk - physical or virtual? Is there a disk queuing difference. Can using multiple partitions on a virtual disk cause SQL stalled IO?
Thanks.
Randy in Marin