[osol-help] ZFS on a fileserver with OpenSolaris?

[Orvar Korvar]

A zfs raid consists of groups of disks. Each group can be 
raidz/raidz2/mirror/etc. You can add a whole new group to a zfs raid. But you 
can not change an existing group, by adding or removing a disk. You can not 
remove a group of disks from a zfs raid. A group is also called a vdev.
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