I read a vSphere blog which states that VSA 5.1 has the following hard disk limits:
“The number of 2TB (or less) disks per host has also been increased. 12 disks can now be supported internally in an ESXi host. In VSA 1.0, this was only 8. One other major enhancement is the support for JBODs (Just a Bunch Of Disks) or disk expansion chassis. An additional 16 disks can now be supported in an expansion chassis attached to an ESXi host. This gives a maximum number of 2TB (or less) physical disks per host of 28.”
Will the Dell 720xd PERC H710P (24 disks internally) be covered as it's not technically 12 internal + an expansion chassis?.
Also as the Dell RAID controller only supports a maximum of 16 disks in Raid 10 would having 2x12 disk RAID 10 arrays cause any issues with one RAID controller (provided each node stays within the 24TB limit)?