Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 123

You can enable or disable multihost access when creating a volume. You can also modify a volume or snapshot and enable or disable multihost access. Allow or Disallow Multihost Volume Access In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots), because multiple computers writing to a target in an uncoordinated manner will result in volume corruption. You can allow or disallow shared (multihost) access to a volume. If you disallow shared access to a volume, only one iSCSI qualified name (IQN) can connect to the volume at one time. However, if you have a certain environment, you might want to allow shared access to a volume. NOTE: Before disallowing shared access to a volume, disconnect all initiators from the volume except one, unless the initiators have the same IQN. If multiple initiators with different IQNs have connections to the volume, you cannot disallow shared access. To allow or disallow shared access to a volume: 1. Click Volumes. 2. Expand Volumes and then select the volume name. 3. Click Set access type to open the Set Access Type dialog box. 4. Choose to allow or disallow shared access. 5. Click OK. About Snapshot Access Controls Online snapshots are seen on the network as iSCSI targets. It is important to protect your snapshots from unauthorized and uncoordinated access by iSCSI initiators. NOTE: When a snapshot is online and accessible, a user or application can change the contents of the snapshot. If the content changes, the snapshot no longer represents a point-in-time copy of a volume and has limited use for data recovery. All iSCSI target security mechanisms apply to snapshots, including access control policies, which prevent unauthorized iSCSI initiator access to a volume and its snapshots. About Multihost Snapshot Access In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots), because multiple computers writing to a target in an uncoordinated manner can result in volume corruption. You can allow or disallow multihost (shared) access to a snapshot. If you disallow multihost access to a snapshot, only one iSCSI qualified name (IQN) can connect to the snapshot at one time. However, if you have a certain environment, you might want to allow multihost access to a snapshot. See About Multihost Access to Targets. NOTE: To disable multihost access to a snapshot, first disconnect all initiators from the snapshot except one. If multiple initiators have connections when you try to disable multihost access, the operation fails unless the initiators have the same IQN. Allow or Disallow Multihost Snapshot Access To enable or disable multihost access to a snapshot: 1. Click Volumes. 2. Expand Volumes and then expand the volume name. 3. Select the snapshot timestamp. 4. In the Activities panel, click Set access type to open the Set Access Type dialog box. About Volume-Level Security 123