Hi Peter,
Peter Tribble wrote:
I'm being a bit of a dunderhead at the moment and neither the site
search nor google are picking up the information I seek...
There was the thread named "Metaslab alignment on RAID-Z" on this list,
you may want to look at it.
I'm setting up a thumper and I'm sure I recall some discussion of the
optimal number of drives in raidz1 and raidz2 vdevs. I also recall
that it was something like you would want an even number of disk for
raidz1, and an odd number for raidz2 (so you always have an odd
number of data drives). Have I remembered this correctly, or am I
going delusional? And, if it is the case, what is the reasoning
behind it?
In short is is better to have
* power of 2 plus 1 more disk for RAID-Z
* power of 2 plus 2 more disks for RAID-Z2
this way you will always have even (power of 2) number of data disks.
With general recommendation of one-digit number of disks in vdev, this
leaves you basicly with these options:
3,5 or 9 disks for RAID-Z vdev
4,6 or 10 disks for RAID-Z2 vdev
Hth,
Victor
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