Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head - Manual (Page 604)

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Product Manual Technology Background
RAID 60
A RAID 60 source logical drive can migrate to the following target logical drives:
Target Requirements
RAID 6
32 physical drives maximum.
RAID 60 must have less than 32 physical drives.
If existing physical drives have no unused space, add 1 or more physical
drives.
RAID 60 Add physical drives. 32 per axle maximum.
You can add physical drives to a RAID 60 array but you cannot change the number of axles.