On September 27, 2006 11:27:16 AM -0700 Richard Elling - PAE <[EMAIL 
PROTECTED]> wrote:
In the interim, does it makes sense for a simple rule of thumb?
For example, in the above case, I would not have the hole if I did
any of the following:
        1. add one disk
        2. remove one disk
        3. use raidz2 instead of raidz

More generally, I could suggest that we use an odd number of vdevs
for raidz and an even number for mirrors and raidz2.

I have a 12-drive array (JBOD).  I was going to carve out a 5-way
raidz and a 6-way raidz, both in one pool.  Should I do 5-3-3 instead?

-frank
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