3DM 2 Online Help

About Controller Policies
The following policies affect all units and drives on a controller and can be adjusted as appropriate for your equipment. Controller policies are shown at the bottom of the Controller Settings page in 3DM.

| 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. (See Setting the Auto Rebuild Policy.)

| 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. (See Using Auto-Carving for Multi LUN Support.)

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. (See Setting the Size of Volumes Created with Auto-Carving.)

| Staggered spin-up. Spin-up allows drives to be powered-up into the Standby power management state to minimize in-rush current at power-up and to allow the controller to sequence the spin-up of drives. Compatible drives are sent a spin up command based on the settings specified with the policies Number of drives per spin-up and Delay between spin-up settings. These policies can only be set using 3BM or the CLI.

| Number of drives per spin-up. Number of drives that will spin up at the same time when the controller is powered up, if staggered spin-up is enabled. From 1 to x, depending on the number of ports on the controller.

| Delay between spin-up. The delay time (in seconds) between drive groups that spin up at one time on this particular controller, if staggered spin-up is enabled.

| It is possible to enable or disable automatic detection of drives on the controller’s ports for staggered spinup during hot-swapping of drives. This feature is only available in the CLI using the autodetect=on|off command. For more information, see 3ware Serial ATA RAID Controller CLI Guide.

| Export JBOD (unconfigured) disks. This setting indicates whether JBOD disks should be exported to the operating system. JBOD configuration is strongly discouraged for newly added disks on a 9000 series controller, in favor of Single Disk, so by default, this setting is disabled. If you have a JBOD configuration from a 7000/8000 controller that you want to use on the 9000 series controller, you should enable this setting. This policy can only be set in 3BM and CLI.

| Staggered method. Indicates whether the type of staggered spin-up is ATA-6 or SATA OOB (Out Of Band). By default, when Staggered Spin-up is enabled, the ATA-6 scheme is used. If your drives support the SATA OOB method, select that method in 3BM. There is no electronic method for the controller to know if a drive supports this method, so it must be set manually. For staggering to work properly, the drives must support the selected method. This policy can only be set and only shows in 3BM.

Some additional policies can be set at the unit level. For more information, see Setting Unit Policies.

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