ZFS with Hitachi SAN Questions

We are moving all our oracle and zone storage to ZFS using an external Hitachi VSP (with Dynamic Provisioning).
Is there a best practice for LUN sizes..? Since I can create a LUN of any using with HDP, what is the best approach:
a) If I need a 1TB zpool, do I allocate a 1TB sized LUN or 10 x 100GB LUNs for example. I don't need to do any mirroring or anything like that. Underneath the hood these LUNs are sitting on the same RAID group. (I guess I could configure the LUNs so they were on different raid groups but this is a level of performance far beyond what I will need for this cluster)
If we are deploying oracle in zone clusters, does it make sense to create different zpools for the zonepath itself, and the /u01, /u02, etc... mounts the database will be using? OR Just create one large zpool that will be the zonepath and then the DBA's can create there /u01, /u02, etc... directories at the root level of the zone?
If using ZFS mirroring to migrate from old storage onto new storage feasible?
ie: I have some solaris 10 u5 stand-alone systems running Oracle using LUNs from a USP-V. The USP-V is being replaced with a VSP and the M5000's are being replaced with new ones (which will be a solaris cluster running solaris 10 update 9) Can I present new LUNs from the VSP to the old systems, configure a mirror for the existing zpools, and then break that mirror, ultimately ending up on the new storage? (and eventually importing these onto the new nodes) The issues I see are a) not sure if the zpool/zfs version of update 5 will pose any problems once imported on the update 9 systems; b) can a mirror be added to a pre-existing zpool that wasn't originally configured that way (I'm sure it can but haven't actually done this)
Thanks for any info

There is what works.
There is what is supported.
It probably works to present the NetApp LUNs to the same HBAs that are accessing the SAN. However, if NetApp says it isn't supported .... then you need to ask them why.

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