Using Auto-Carving for Multi LUN Supportwww.3ware.com 91To enable Auto-Rebuild through 3BM1 On the main 3BM screen, Tab to Settings and press Enter.2 On the pop-up menu, select Controller Policies and press Enter.3 On the Policy Settings page, Tab to the Auto-Rebuild field, press Enterto display the options, select Enable and press Enter again to select it.4 Tab to OK and press Enter to select it.The policy is enabled immediately.To enable Auto Rebuild through 3DM1 Choose Management > Controller Settings from the menu bar in 3DM.2 In the Other Controller Settings section at the bottom of the screen, selectthe Enabled option for Auto Rebuild.The page refreshes, and a message at the top confirms the change youhave made.Using Auto-Carving for Multi LUN SupportWhen the Auto-Carving policy is on, any unit larger than a specified size(known as the carve size) is created as multiple volumes that can be addressedby the operating system as separate volumes. These chunks are sometimesknown as multiple LUNs (logical units). However, throughout the 3waredocumentation, they are referred to as volumes.For example, using the default carve size of 2 TB, if the unit is 2.5 TB then itwill contain two volumes, with the first volume containing 2TB and thesecond volume containing 0.5 TB. If the unit is 5.0 TB then it will contain 3volumes, with the first two volumes containing 2 TB each and the last volumecontaining 1 TB. (Note: If a specific Boot Volume was also specified in 3BM,the first volume will be the size specified for the Boot Volume, and then thecarve size will be applied to the remainder of the unit. For more information,see “Boot volume size” on page 99.)Each volume can be treated as an individual disk with its own file system. Thedefault carve size is 2 TB; you can change this to a setting in the range of1 TB to 2 TB (1024 MB to 2048 MB). 3ware firmware supports a maximumof 8 volumes per controller, up to a total of 16 TB.If you are migrating a unit to a size that is larger than the carve size and auto-carving is on, multiple volumes will be created.
