zfs code - Jan 2008 - Moving zfs to an iscsci equallogic LUN

We have a Mirror setup in ZFS that''s 73GB (two internal disks on a sun
fire v440).  We currently are going to attach this system to an Equallogic Box,
and will attach an ISCSCI LUN from the  Equallogic box to the v440 of about
200gb.  The Equallogic Box is configured as a Hardware Raid 50 (two hot spares
for redundancy).

My question is what''s the best approach to moving the ZFS data off the
ZFS mirror to this LUN, or joining this LUN to ZFS but not have a ZFS mirror
setup anymore because of the disk waste with the mirror setup.  Whatever the
approach is the current data cannot be lost, and the least downtime would help
too.  I thought the best approach might be to create the LUN as a 200 GB ZFS
pool, and then do a ZFS export from the 73GB drive and a ZFS import on the 200
GB iscsci LUN. This LUN would still be setup as a RAID 50 even though its a ZFS
file system so we would still have some redundancy and we could eventually grow
this pool.  Or would it be better to go UFS on the LUN and copy the data over?

What would be the best approach for moving this data or configuring the disks
involved?  I''m open to any suggestions?
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What would be the commands for the three way mirror or an example of what your
describing. I thought the 200gb would have to be the same size to attach to the
existing mirror and you would have to attach two LUN disks vs one LUN.  Once it
attaches it automatically reslivers or syncs the disk then if I wanted to I
could remove the two 73 GB disks or still keep them in the pool and expand the
pool later if I want?
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