An inexpensive storage expansion solution on HP servers like a DL-360G4 or equivalent is to get (used from ebay), a 6402 RAID cacheing controller, an MSA30 JBOD, and a bunch of 10K or 15K used 146GB U320 drives. For about $1,500, you can put together a terabyte of very high performance RAID10 storage and still have expansion capacity.
With Zimbra shut down, you can rsync /opt/zimbra to the JBOD, remount /opt/zimbra on the JBOD, and you are done. If you want to maximize performance, create separate RAID10 arrays (with appropriately sized and speedy disks) for ~/backup, ~/db, ~/data, etc.
Hope that helps!
All the best,
Mark
__________________
___________________________________ L. Mark Stone, CIO  "Uptime. All the time."
477 Congress Street | Portland, ME 04101-3431 | (207) 772-5678
proactive maintenance and monitoring | technology consulting
Zimbra groupware | EMR implementations | private cloud hosting
|