Assigning LUNs to VMware servers
We are running a mixture of Windows (2003-2008R2) servers both physical and virtual. The virtual environment is ESX 3.5 (we are planning on upgrading over the summer). On top of this, we have an HDS AMS2100 SAN.
We have a number of SAN LUNs assigned to our virtual servers. However, there doesn’t seem to be much in the way of consistency in how this is done. Some are mapped directly through the OS, some are configured through VMware as RAW device mappings, and some are configured as VMware virtual disks on datastores mapped to the VMware environment.
What are the pros and cons of each approach for both OS and data drives?