> Actually, you do want /usr and much of /var on the root pool, they
> are integral parts of the "svc:/filesystem/local" needed to bring up
> your system to a useable state (regardless of whether the other
> pools are working or not).

Ok. I have my feelings on that topic but they may not be as relevant for
ZFS. It may be because I tried to avoid single points of failure on other
systems with techniques that don't map to ZFS or Solaris. I believe I can
bring up several OS without /usr or /var although they complain they will
work. But I'll take your point here.

> Depending on the OS versions, you can do manual data migrations
> to separate datasets of the root pool, in order to keep some data
> common between OE's or to enforce different quotas or compression
> rules. For example, on SXCE and Solaris 10 (but not on oi_148a)
> we successfully splice out many filesystems in such a layout
> (the example below also illustrates multiple OEs):

Thanks, I have done similar things but I didn't know if they were
"approved".

> And you can not boot from any pool other than a mirror or a
> single drive. Rationale: a single BIOS device must be sufficient
> to boot the system and contain all the data needed to boot.

Definitely important fact here.

Thanks for all the info!
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