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Controller policies are shown at the bottom of the Controller Settings page. • Auto Rebuild. Determines whether the Auto Rebuild policy is enabled or disabled. When disabled, degraded units can only be rebuilt with designated spares. When enabled, the controller firmware will attempt to rebuild a degraded unit if there is no spare, using either an available drive or a failed drive. • Auto-Carving. Determines whether the auto-carving policy is enabled or disabled. When it is enabled, any unit larger than a specified size (known as the carve size) is broken into multiple volumes that can be addressed by the operating system as separate volumes. The default carve size is 2 TB. This auto-carving feature is sometimes referred to as multi-LUN, where each volume that is created is referred to as a “LUN.” • Carve Size. Sets the size for dividing up units into volumes when Auto- Carving is enabled. This setting can be between 1024 and 2048 GB. Some additional policies can be set at the unit level. For more information, see “Setting Unit Policies” on page 44. Setting the Auto Rebuild Policy The Auto Rebuild policy determines how the controller firmware will attempt to rebuild degraded units. When Auto Rebuild is disabled, only spares will be automatically used to rebuild degraded units. When Auto Rebuild is enabled, the firmware will select drives to use for automatically rebuilding a degraded unit using the following priority order. • Smallest usable spare. • Smallest usable unconfigured (available) drive. • Smallest usable failed drive. Enabling Auto Rebuild allows you to add a drive to the controller and have it be available for a rebuild, without having to specify it as a spare. With Auto Rebuild enabled, if you accidentally disconnect a drive (causing the controller to see it as a failed drive) and then reconnect it, the controller will automatically try to use it again. Chapter 4. Configuring Your Controller To enable Auto Rebuild through 3DM 1 Choose Management > Controller Settings from the menu bar in 3DM. 2 In the Other Controller Settings section at the bottom of the screen, select the Enabled option for Auto Rebuild. The page refreshes, and a message at the top confirms the change you have made. Using Auto-Carving for Multi LUN Support When 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 addressed by the operating system as separate volumes. These chunks are sometimes known as multiple LUNs (logical units). However, throughout the 3ware documentation, they are referred to as volumes. For example, using the default carve size of 2 TB, if the unit is 2.5 TB then it will contain two volumes, with the first volume containing 2TB and the second volume containing 0.5 TB. If the unit is 5.0 TB then it will contain 3 volumes, with the first two volumes containing 2 TB each and the last volume containing 1 TB. Each volume can be treated as an individual disk with its own file system. The default carve size is 2 TB; you can change this to a setting in the range of 1 TB to 2 TB (1024 MB to 2048 MB). 3ware firmware supports a maximum of 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. Note: Using auto-carving can have an impact on performance. You must turn on the Auto-Carving policy before creating the unit. Units created with this policy turned off will not be affected by a change to the policy. If the policy is turned off later, units that have been carved into volumes will retain their individual volumes; existing data is not affected. To use auto-carving 1 Enable the auto-carving feature. In 3DM, enable Auto-Carving at the bottom of the Management > Controller Settings page. 3ware Serial ATA RAID Controller User Guide for the Power Mac G5 Setting the Size of Volumes Created with Auto-Carving 2 Create a new unit or migrate an existing unit to include the drives you want to use. If the combined capacity of the drives exceeds the carve size, a number of volumes will be created. 3 Verify the creation of the volumes. In 3DM 2, the number of volumes is shown on the Unit Details page. 4 Verify that the volumes appear in the operating system. They will appear as additional drives. Notes: • When volumes have been created through auto-carving, they cannot be deleted except by deleting the unit. • Changing the auto-carve policy does not affect existing units. Setting the Size of Volumes Created with Auto-Carving If you create units over 2 TB in size and use auto-carving to divide them into multiple volumes, you can control the size of the volumes to be created by setting the carve size to use. The carve size can be between 1 TB (1024 GB) and 2 TB (2048 GB); the default is 2 TB. When you change this policy, it applies to units you create in the future. Existing units will not be affected. To...