The reason I was thinking of using MetaLUNs across the 2 DAE's holding the 600GB disks to ensure we get can optimize more SPs rather having the LUNs across a single DAE using 1 SP.
This could be a good reason.
But you can reach quite the same by using more LUNs owen by different SP.
We'll probably be using RAID5 with 4-5disks per RAID group and a global spare.
If you have several disks consider also to build a RAID10 Raid Group.
But what about the VMFS block size - is there any impact on performance?
None.
But alignment could help. See:
In our case we'll most likely use the latter 800GB but does that also mean my VMFS should map to each LUN so 1VMFS : 1LUN.
IMHO 800 GB is a good size, and is better to have 1:1 for LUN/VMFS and Raid Group.
But should VMFS extents be used
I prefer to do not use extents.
And also if some VMs have d:\ e:\ f:\ that may total to larger than 800GB what would be the best approach
Consider to use RDM disk in this case.
Andre