On Apr 2, 2011, at 5:28 PM, Dawid Horacy Golebiewski <dawid.golebiewski@xxxxxxxxxxxxx> wrote:
> I pondered Solaris for some time, but as I do not intend to build the OS
> "from scratch" and nexenta was to GUIed for me I started researching SME.
> What puzzled me is the theory and the practice: RAIDz is the best
> solution from a theoretical standpoint (maximum features available) but
> still raid 5,65+0 etc. are used. Why?
Raidz/2/3 isn't raid5/6, similar but not the same.
In ZFS you create vdevs, which can be individual disks, mirrors or raidzs. Then you create a pool out of multiple vdevs. The vdevs should be of the same size and type for performance and capacity planning reasons, but it's not a requirement. Currently you cannot add drives to a vdev, but you can add vdevs to a pool. IO written to a pool does round robin across the vdevs giving a raid0 type performance.
-Ross
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