On Sat, 28 Feb 2009 21:45:12 -0600, Mike Gerdts
<mger...@gmail.com> wrote:

>On Sat, Feb 28, 2009 at 8:34 PM, Nicolas Williams
><nicolas.willi...@sun.com> wrote:

[snip]

>> Right, but normally each head in a cluster will have only one pool
>> imported.
>
>Not necessarily.  Suppose I have a group of servers with a bunch of
>zones.  Each zone represents a service group that needs to
>independently fail over between servers.  In that case, I may have a
>zpool per zone.  It seems this is how it is done in the real world.[1]
>1. Upton, Tom. "A  Conversation with Jason Hoffman."  ACM Queue.
>January/February 2008. 9.

Exactly. Or even a zpool per application, if there is more
than one application in a zone. In that sense, I would call
a zpool a "unit of maintenance". Or a "unit of failure".
-- 
  (  Kees Nuyt
  )
c[_]
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