There's one key advantage to using the SAN vendor's host tools to connect the LUN guest-side: off-host backup using VSS Hardware Providers. It creates an app-aware snapshot (so Exchange and SQL are quiesced before snap) then the snapshot is directly mounted on the backup server. Your production server doesn't get slowed down by the backup (as long as your SAN isn't being worked to 100% obv.). Backup Exec 12.5 and up support this.
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