3Ware 9550SXU-16ML User Guide - Page 185

About Background Tasks About Self-tests Two self-tests can be set, to check whether UDMA Mode can be upgraded, and whether SMART thresholds have been exceeded. Initially, these tests are set to run every 24 hours. You can change the schedule for when they are run, and you can disable the tests, if you prefer not have to have them performed. For more information, see "Selecting Self-tests to be Performed" on page 180. Setting Background Task Rate In 3DM, you can set the relative performance of background tasks (initializing, rebuilding, and verifying) in relation to normal I/O activity. 9000-series controllers show separate settings for Rebuild Rate and Verify Rate. (Initialization occurs at the Rebuild rate.) 7000- and 8000-series controllers show only one setting for Task Rate, which applies to both rebuild and verify rates. Rebuild and verify tasks can be started manually or scheduled. For details about manually starting these processes, see "Rebuilding Units" on page 181 and "Verifying a Unit through 3DM" on page 187. For details about scheduling rebuild, verify, and other tasks, see "Scheduling Background Tasks" on page 176. To change the background task rate 1 Choose Management > Controller Settings from the menu bar. 2 In the Background Task Rate section of the Controller Settings Page, select one of the five radio buttons to indicate the relative task rate for Rebuild and Verify Tasks. The furthest left buttons set the firmware to the fastest rebuild and verify settings. This means that maximum processing time will be given to rebuilds or verifies rather than I/O. The furthest right buttons set the firmware to the slowest rebuild and verify settings, giving maximum processing time to I/O. After you select one of the radio buttons, the page refreshes, and a message at the top confirms the change you have made. For more information about these settings, see the reference section, "Controller Settings Page" on page 92. www.3ware.com 175