Dell Equallogic PS6000 - Manual (Page 9)

Configuring a Dell™ EqualLogic™ PS Series Array as a Backup Target for CommVault™ Simpana™
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Once this ACL entry is created, on the protected server, a new entry with the suffix
‘vss-control’ will be present in the list of targets in the Targets tab of the iSCSI
initiator properties.
 For each volume on which the data that needs to be protected resides, ensure there is
sufficient Snapshot Reserve free space. The amount of Snapshot Reserve space required will
depend on the Snapshot Retention Policy of the volume and how the volume is actually used.
The default Snapshot Reserve space setting is 100% of volume reserve. See Figure 4.
Figure 3: VDS/VSS Access in Group Configuration