Best option is to stripe pairs of mirrors. So in your case create a pool which
stripes over 3 mirrors, this will look like:
pool
mirror:
thumper1
thumper2
mirror:
thumper3
thumper4
mirror:
thumper5
thumper6
So this will stripe over those 3 mirrors.
you can add mirrors if extra space is needed.
That's the way we implement it right now.
You can loose up to 3 servers (as long as they don't belong to the same mirror)
Of course the "nas head" is a single point of failure, and clustering iscsi
zpools isn't that easy as you would hope :-( iscsi is not yet supported by the
sun cluster framework.
One of the drawbacks you can also expect is when you ever have to boot the
nashead while some or all of the targets are unavailable, solaris is doing very
nasty during start up, instead off just booting and putting the pool in
degraded mode you will get the nashead hanging during boot untill you fix the
targets, then the nashead continues to boot.
If you really concern about speed I would advice you to use Infiniband and not
ethernet, its also a good idea to Isolate the iscsi traffic.
K
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