So you can setup a LUN/mount point to use /opt/zimbra/store and another LUN/mount point to use /opt/zimbra/store2, the install procedure will initially use /opt/zimbra/store and begin using the first LUN (say a RAID5 LUN of 100GB), watch the space used and the IO load ... then use zmvolume to start using the second LUN allocated to the second RAID5 of 100GB.
Once the second LUN is used for a while (and old mail is deleted from the first LUN) can you switch back to the first? /opt/zimbra/store ?
This would seem to be an approach for "balancing" your IO across disks to maintain or improve performance as the MessageStore grows. Anyone have any input to this approach?