AMCC 720-0138-00 manual Setting Unit Policies

Chapter 5. Configuring Units

4In the text box, enter or type over the name shown.

A name can be up to 21 characters, and can include dashes and underscores.

5Click the Save Names button.

Note: If you want to cancel your change before saving it, click the

Reset Names button.

Setting Unit Policies

The following polices are set when you create a unit, and can be adjusted later through settings on the Management > Controller Settings pages of 3DM. Details about adjusting each policy are described on the following pages.

•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. For details, see “Enabling and Disabling the Unit Write Cache” on page 45.

•Auto Verify. Determines whether Auto Verify is enabled for the unit. When enabled, the Auto Verify policy causes a verify task to be performed automatically once every 24 hours. This feature is designed to make it easier to insure regular verification of units. If verify schedules have been enabled, then Auto Verify will run only in the scheduled verify time slots. When Auto Verify is 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” on page 46.

•Continue on Source Error During Rebuild. Determines whether ECC errors are ignored when they are encountered during a rebuild. (ECC errors are an indication of errors that have occurred on a particular drive since it was last read.) When not enabled, a rebuild will abort upon encountering an ECC error and the unit will be set to Degraded. For details, see “Setting Continue on Source Error During Rebuild” on page 47.

•Queuing. Determines whether NCQ (Native Command Queuing) is enabled for the unit. When enabled for drives that support it, this policy can improve performance. For details, see “Enabling and Disabling Queuing for a Unit” on page 47.

44 3ware Serial ATA RAID Controller User Guide for the Power Mac G5