max cache on VNX 5300 is 500G  [URL]
We recently purchased a VNX5300 for a small VDI deployment (500 users or less).  We ordered 38 SAS drives and 10 EFDs.  The vSpecialist at EMC is recommending:  2 EFD for FAST Cache 7 EFD in FAST Pool 1 (RAID-5) 30 SAS drives in FAST Pool 1 (RAID-5)  The remaining EFD and SAS drives are for the vault and spares and stuff like that.  I'm fine with the recommendation, but I wonder if this might be better:  8 EFD as FAST Cache 6-disk RAID-10 groups on the SAS drives (five of them)  MetaLUN across the RAID-10 groups for replica datastore and all the desktops.  Many (if not all) of the desktops are persistent.  This will be running on vSphere 5 and View 5.  Assume 3 images and about 200 users initially, scalable to about 500.  With this many spindles, capacity is not a concern.  This array is dedicated to VDI.  What do you think?
MetaLUN vs. FAST Pool