zfs discuss - Jul 2010 - ZFS v10 crisis alert - has a zfs subdirectory disappeared?

Had a weird one yesterday, so am looking for some insight...  At the very least,
a deeper understanding of this will contribute to our administration skills!

Have a sun4u server with one zpool under which we''ve created a number
of zfses.  Something like:

/pool/zfs1
...    /zfs2
...    /zfs3

Here''s what may be the key bit: One of these filesystems, zfs3, we had
renamed to something more practical in our environment, like
''3''.  Significantly,  I ''thought'' we had
made this change permanent (gotta go back through notes to see how we did this,
whether with an ''mv'' command or a zfs rename command(?)  TBD.)
In any case, this renamed filesystem - ''3'' - has been up and
running for months; it''s referenced in service scripts and any number
of other tools.  Has been working flawlessly as ''/pool/3''.

Last night, in an abundance of caution, we did an organized hard shutdown -
tornado threats!  Since rebooting - again, flawlessly, with no error messages -
the /pool/3 filesystem is empty!  Initially, this put the SA''s cold
chill through us, as this fs is home to one of our sandbox databases.  Happily,
the data is there, but back under the original, pre-renaming filesystem.  This
raises some questions, though:

Shouldn''t a simple # zfs rename -p command persist?  If we stupidly
tried this renaming as a mv command, would any of you expect these findings?
As we have certainly done system reboots since creation of these filesystems,
what precipitating event may have triggered this?
What, exactly, IS the behavior we''re seeing?

More broadly, it''s time to look at updates.  We haven''t
patched this machine (Solaris 10, Generic_139555-08) for quite some time, as we
have (had?) been investing heavily in opensolaris.  Now, that is in limbo until
we see clear direction from Oracle.

# zpool status looks good. # zpool scrub runs with no error.  # zpool upgrade
alerts me to the fact that we''re still using version 10! - Is this just
downright [i]unwise?[/i]  (I know you are all opensolaris, but:) What patch
options are available to us for this machine, in this brave new world, and which
ones should we absolutely avail ourselves of?

Really, really, eager - as I know all of you are - to get a final clear
direction from Oracle on their intentions for opensolaris. This
''direction'' should take the form of a
''release'', with clear statements regarding their commitment to
the opensolaris community and this forum.

Many thanks,  Lou
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Why not just set other mountpoint for your zfs dir?

# zfs set mountpoint=/pool/3 path/to/zfs/dir

After that contents of /pool/zfs3 would be shown under /pool/3.
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