Predictive
The Predictive Scheme utilizes several LUNs with different storage characteristics
- Create several Datastores (VMFS or NFS) with different storage characteristics and label each datastore according to its characteristics
- Locate each application in the appropriate RAID for its requirements by measuring the requirements in advance
- Run the applications and see whether VM performance is acceptable or monitor HBA queues as they approach the queue full threshold
- Use RDM’s sparingly and as needed
Adaptive
The Adaptive Scheme utilizes a small number of large LUNs
- Create a standardised Datastore building bloc model (VMFS or NFS)
- Place virtual disks on the Datastore
- Run the applications and see whether disk performance is acceptable (On a VMFS Datastore, monitor the HBA queues as they approach the queue full threshold
- If performance is acceptable, you can place additional virtual disks on the Datastore.If it isn’t Storage vMotion the disks on to a new Datastore
- Use RDM’s sparingly
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