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.

src="https://i.stack.imgur.com/dG55N.png" alt="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.

src="https://i.stack.imgur.com/zihyq.png" alt="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?

Comments

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