storage - Disadvantages of more RAID 5 arrays in a RAID 50 array

We have a 24 disk SAN, currently configured in RAID 50, with a RAID 0 stripe across two RAID 5 arrays with 11 disks in each RAID 5. The two remaining disks are allocated as hot spares, one for each RAID 5.

Initial RAID 5 setup with two RAID 5 arrays

I'd like to move this setup to use RAID 50 with three RAID 5 arrays inside the RAID 0 stripe. This increases the amount of disks that can fail before the array is lost, as well as decreases the chance that two disks fail in the same RAID 5 array. It may also have performance benefits.

Desired RAID 50 setup with three RAID 5 arrays

What disadvantages does moving to a greater number of RAID 5 arrays in a RAID 50 setup have? Obviously, you are sacrificing usable capacity for increased resiliency, but are there any other disadvantages going from a RAID 50 with two larger RAID 5 arrays to a RAID 50 with three (or more) smaller RAID 5 arrays?

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