HP StorageWorks 2000 Modular Smart Array Reference Guide (481599-003, August 2008)

92 HP StorageWorks 2000 Family Modular Smart Array reference guide • August 2008
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.