HP StorageWorks MSA2012i HP StorageWorks 2000 Modular Smart Array Reference Gu - Page 92

To change a volume's write-back cache setting: 1. Select Manage > Volume Management > Volume Menu > Write Back Cache. For each virtual disk, the virtual disk panel shows a status icon; the name, RAID level, size, number of disk drives, and number of volumes; and utility status, if any. 2. Select a virtual disk. The selected virtual disk's volume names, sizes, and write-back cache settings are displayed, and the amount of free space. 3. Select the standard, snap-pool, or master volume whose cache setting you want to change. 4. Depending on the current setting, click Enable Write Back Cache or Disable Write Back Cache. When processing is complete, the new value is displayed in the Volume Menu panel. Changing Auto-Write-Through Triggers and Behaviors You can set conditions that cause ("trigger") a controller to change the cache mode from write-back to write-through. You can also specify actions for the system to take when write-through caching is triggered. For an explanation of cache modes, see "Changing a Volume's Write-Back Cache Setting" on page 91. To change auto-write-through triggers and behaviors: 1. Select Manage > General Config > System Configuration. 2. Click Advanced Options. 3. In the SCSI Configuration Options panel, under Auto-Write Through Triggers, select the options to enable: ■ Controller Failure Trigger - Changes to write-through if a controller fails. The default is Disabled. ■ Cache Power Trigger - Changes to write-through if cache backup power is not fully charged or fails. The default is Enabled. ■ A/C Power Trigger - Changes to write-through if A/C power fails. The default is Disabled. 92 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008