There is not only the Problem if this big volume becommes corrupt.
If you implement in Future somthing like Veem with integrated 3PAR Backup or the new StoreOnce Recovery Manager Central, the Snapshot on the 3PAR for Backing up one VM is done on this realy big volume that includes many other VMs. Look at ESX v6 and vVols you will see a complete different way using Datastores in future. The Industry Trend going to have every VM there own LUN (or LUNs) in Future.
By the Way, if you sometime in Future want to use QoS on 3PAR it is better to have smaler Volumes. And if you want to montior and Track 3PAR Performance more Volumes give you a better oversight (who is growing most, who is pulling the most Performance, ...). And, so on...
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