3Ware 9550SXU16MLB10 User Guide - Page 107

Changing An Existing Configuration The Maintenance page updates to show the new unit and the Migration progress. 8 Inform the operating system of the change, as described below. Note: You can only migrate a unit to a RAID level that has the same or more capacity as the existing one. A four-drive RAID 5 unit can migrate to a four-drive RAID 0, but a four-drive RAID 0 unit cannot migrate to a four-drive RAID 5, without adding another drive, due to the need for additional storage capacity for parity bits. Expanding Unit Capacity You can expand a unit's capacity by adding one or more drives to it without changing the RAID level, except for singles and RAID 1 units. (Since a single can only have one drive, and a RAID 1 can only have two drives, if you add a drive to either, the RAID level must be changed.) Expanding unit capacity can be accomplished while the unit is online, without experiencing any data loss. This process is also referred to as Online Capacity Expansion (OCE). To expand a unit's capacity 1 In 3DM 2, choose Management > Maintenance. 2 In the Unit Maintenance table on the Maintenace Page, select the unit you wish to expand by checking the box next to the Unit ID. 3 Click the Migrate Unit button. The Migrate dialog box appears, listing the drives which can be added to the unit. 4 Select the drives(s) you wish to add to the unit by checking the Port ID box next to each one. 5 If desired or necessary, select the appropriate RAID level. 6 Click OK. The Maintenance page updates to show the newly reconfigured unit. The Status column title indicates that Migration is in progress. 7 Inform the operating system of the change, as described below. Note: You can also perform these steps using the CLI. For more information, see the 3ware 9000 Series Serial ATA RAID Controller CLI Guide. www.3ware.com 101