I'm creating ONE Raidz2 Pool with 23 drives and a hot spare. (I know the hot spare isn't fully supported yet but thats fine)
Is it a bad idea to use this many disks in a single pool?
What would the consequences be if I did do this?
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Bad. Scrap it and use a distribution with a newer version of ZFS and features. NexentaStor is a good bet.
So why do I say it's bad? That pool layout goes against ZFS best practices. Please read here first.
For RAIDZ2, start at 6 disks and do not exceed 12 disks in each vdev...
try to have an even number of disks in the vdev if using raidz2...
Consequences include poor I/O performance (ZFS scales with the number of vdevs/groups of RAID disks), long rebuild times and the fact that mirrors will always outperform.
What are you planning to do with this storage setup?