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?

1 Answer 1


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?

  • 1
    nas4free also has a new version of zfs.
    – hookenz
    Oct 11, 2012 at 23:31
  • Just office file storage. Documents and such. Oct 15, 2012 at 20:45

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