I realize I can't remove devices from a vdev, which, well, sucks and
all, but I'm not going to complain about that. ;)

I have 4x500G disks in a RAIDZ.  I'd like to repurpose one of them as
I'm finding that all that space isn't really needed and that one disk
would serve me much better elsewhere (as the second half of a mirror
in a machine going into colo).

SYS1                   124G  1.21T  29.9K  /SYS1

the only other storage in the machine is the small 60G pool made up of
the remains of the OS disks, which is not going to be enough space to
hold this all while I rebuild the array.

Is there any way that I could possibly get one of the disks out of the
pool long enough to be used as temp space while I rebuild the array with
just 3 disks?

I'm thinking either to pull it out of the machine and scribble all over
it in another machine so that it no longer has its ZFS bits on it.  If
this plan works, then it would just be a blank disk (although it will
have the same dev id, so I don't know if zfs will pick it back up anyway).

The other plan is to replace it with a file that resides on the 60G
partition.  This seems more likely to work, but I don't know how that'd
work out with the fact that the file would be a lot smaller than the
actual pool.  Maybe a thinly provisioned dev would do the trick, as I
could then make it look like 500G, but it would only really use what
it needed to resync the pool.

Is this logic all correct based on how ZFS works on snv_64a?

I could also upgrade first if that's at all recommended, it's something
I've been meaning to do anyway.

-brian
-- 
"Perl can be fast and elegant as much as J2EE can be fast and elegant.
In the hands of a skilled artisan, it can and does happen; it's just
that most of the shit out there is built by people who'd be better
suited to making sure that my burger is cooked thoroughly."  -- Jonathan 
Patschke
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