Error 749 - The operation cannot complete because the disk pool limit would be exceeded.

Hello all.

I have a MD3260 and associated MD3060e fully populated with 120 physical discs. I currently have a disk pool configured with 88 physical disks and a 4 disk preservation capacity. When I attempt to add even a single unused physical disk I get the error

Error 749 - The operation cannot complete because the disk pool limit would be exceeded.

Which is odd as

• The manual says

"Each disk pool must have a minimum of eleven physical disks. Although there is no limit on the maximum number of physical disks that can comprise a disk pool, the disk pool cannot contain more physical disks than the maximum limit for each storage array."

• I have a backup site with the same kit where I have a pool wit 91 physical discs.

Where is this limit coming from?