Changing An Existing Configuration by Migratingwww.3ware.com 123To change the RAID level of a unit1 In 3DM 2, choose Management > Maintenance.2 In the Unit Maintenance table on the Maintenance Page, select the unit forwhich you wish to change the RAID level, by checking the box next tothe Unit ID.3 Click the Migrate Unit button.The Migrate dialog box appears.4 Select any drives to be added to the unit.5 Select the new RAID level.6 Optionally, select a new Stripe size.7 Click OK.The Maintenance page updates to show the new unit and the Migrationprogress.8 Inform the operating system of the change, as described below under“Informing the Operating System of Changed Configuration”.Expanding Unit CapacityYou can expand a unit's capacity by adding one or more drives to it withoutchanging the RAID level, except for singles and RAID 1 units. (Since a singlecan only have one drive, and a RAID 1 can only have two drives, if you add adrive to either, the RAID level must be changed.)For example, for a RAID 5 with 3 drives, you can change the capacity byadding a forth drive.Expanding unit capacity can be accomplished while the unit is online, withoutexperiencing any data loss. This process is also referred to as Online CapacityExpansion (OCE).To expand a unit’s capacity1 In 3DM 2, choose Management > Maintenance.2 In the Unit Maintenance table on the Maintenance Page, select the unityou wish to expand by checking the box next to the Unit ID.The unit to be migrated must be in a normal state (not degraded,initializing, or rebuilding) before starting the migration.
