3Ware 9550SXU-12 User Guide - Page 247

Maintenance page rebuilding.) If rebuild scheduling is not enabled, the rebuild process will begin right away. For more information about rebuilds, see "To verify a unit through 3BM" on page 166. Migrate Unit. Reconfigures a unit while it is on-line. Migration can be used to change the RAID level, to expand the capacity by adding additional drives, or to change the stripe size. Warning: Once migration of a unit is started, it cannot be cancelled. When you select a unit and click Migrate Unit, a dialog box appears which lists the drives in the unit and any additional available drives. In the dialog box are two drop-down menus, one for choosing the RAID level and one for choosing stripe size. Figure 106. Migrating a unit You can only migrate a unit to a RAID level that will be larger than the original unit. For example, you can migrate from a RAID 5 array with 4 drives to a RAID 0 with four drives but you cannot migrate from a RAID 5 with four drives to a RAID 10 with four drives. After you have specified changes to the unit, the Unit Maintenance screen reflects your changes and shows the percentage of migration completed. While the unit is migrating, you can still access the unit as normal but the performance will be lower. You can adjust the I/O rate with the radio buttons on the Controller Settings page. (See "Setting Background Task Rate" on page 172.) Remove Unit. Removes a selected unit and allows you to unplug the drives and move the unit to another controller. The data on the unit remain intact. www.3ware.com 235