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We used to create volume size 3x of lun size (to support snaps created by snapdrive). If you have the storage then all good. To create Thin LUN make sure your application supports thin LUN, some apps require Thick LUNs.
You can optimize your LUN and volume configurations for maximum storage utilization or for the security of write guarantees. Based on your requirements for storage utilization and your ability to monitor and replenish free space quickly, you must determine the FlexVol volume and LUN volumes appropriate for your installation.