Dell EqualLogic PS6210XS EqualLogic Group Manager Administrator s Guide PS Ser - Page 132

About Overriding Automatic Load Balancing A PS Series group uses automatic performance load balancing (enabled by default) to identify the RAID level that provides the best performance for a volume and store volume data on pool members with that RAID level, if such members are available. You can override automatic performance load balancing (or ignore any RAID preference for the volume) by binding a volume to a specific pool member. If you bind a volume to a pool member, the group stores the volume data on the member, instead of distributing data across multiple pool members. The following restrictions apply: • You can bind a volume only to a member that is in the same pool as the volume. • If you bind a volume to a member and then delete that member from the pool or group, the group cancels the bind operation. • Thin clones inherit the member binding setting, if any, of the template volume. You cannot have a separate member binding setting for a thin clone. • You cannot enable synchronous replication on a volume that is bound to a group member. • You cannot use the Group Manager GUI to bind a volume to a member. Instead, you must use the following Group Manager CLI command line: volume select volume_name bind member_name To unbind a volume from a member, use the following CLI command line: volume select volume_name unbind See the Dell EqualLogic Group Manager CLI Reference Guide for more information about using CLI commands. Shut Down a Group To perform maintenance, you might need to shut down a PS Series group. While the group is shut down, volumes are not available. 1. Stop all I/O applications connected to the group. 2. Disconnect iSCSI initiators from the group. 3. Shut down each group member. Do not turn off power to the PS Series array until you cleanly shut down the member. To shut down a member: a. Click Group. b. Expand Members and select the member that you want to shut down. c. Click the Maintenance tab. d. In the Power panel, click the Shut down button. e. In the Member shutdown dialog box, enter the grpadmin password and click OK. (Only group administrators can shut down members.) f. The system displays a warning message that the member is shutting down. Click OK to acknowledge the warning. 4. To turn off array power, turn off all power switches on the array after the shutdown completes. To restart the group, power on all group members. Create an Empty Storage Pool 1. Click Group. 2. Select Storage Pools. 3. Click Create storage pool to open the Create Storage Pool dialog box. 4. Specify a pool name and, optionally, a description. 132 PS Series Group Operations