Setting Unit Policies

The following polices are set when you create a unit, and can be adjusted later through settings on the Maintenance pages of 3DM and 3BM.

Unit Write Cache. Determines whether write cache is enabled for the unit. When the write cache is enabled, data is stored locally on the drive before it is written to disk, allowing the computer to continue with its next task. This provides the most efficient access times for your computer system. When disabled, the computer will wait for the drive to write all the data to disk before going on to its next task.

This feature interacts with functionality of the BBU, if you have one, and with StorSave profiles on a 9550SX and 9590SE. For details, see Enabling and Disabling the Unit Write Cache.

Auto-Verify. Determines whether auto-verify is enabled for the unit (9000-series controllers only). When enabled, verify tasks are performed automatically when the firmware determines that one is needed. When disabled, you must manually specify when you want to verify a unit, even if you have set a verify schedule. For details, see Setting Auto-Verify for a Unit.

Continue on Source Error During Rebuild. Determines whether ECC errors are ignored when they are encountered during a rebuild (9000-series controllers only). When not enabled, a rebuild will abort upon encountered an ECC error and the unit will be set to Degraded. For details, see Setting Continue on Source Error During Rebuild.

Queuing. Determines whether NCQ (Native Command Queuing) is enabled for the unit (9550SX and 9590SE controllers only). When enabled for drives that support it, this policy can improve performance. For details, see Enabling and Disabling Queuing for a Unit.

StorSave Profile. Determines what StorSave profile is used for the unit (9550SX and 9590SE controllers only). Three profiles are available: Protection, Balanced, and Performance. For details, see Setting the StorSave Profile for a Unit.

Note: If the unit write cache is disabled, the StorSave Profile feature is disabled.

Setting Unit Policies

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