zfs code - Apr 2008 - UFS or ZFS for MYSQL and APACHE web server data and Database

I have two 200GB ISCSI LUN''s setup on each X4600 M2 running Solaris 10
X86 update 4.  The data on these ISCSI disks for one server will be Apache and
on the other server MYSQL.  My question is should I setup these disks as a ZFS
Pool filesystem or as a UFS soft  partition (eventually the LUN will be
expanded).  What would offer the best performance and easier to expand later on?
What file system as less problems setting up data this way?  This will be on
production systems so I need to the best results.

The disks are connected to a Equallogic box that''s setup as a Raid 50.
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