Administrator Guide

Change auto-write-through cache triggers and behaviors

1. In the System topic, select Action > Advanced Settings > Cache.

2. In the Auto-Write Through Cache Trigger Conditions section, either select to enable or clear to disable the options:

Controller Failure Changes to write-through if a controller fails. In a dual-controller system this option is disabledby

default. In Single Controller mode this option is grayed out.

Cache Power Changes to write-through if cache backup power is not fully charged or fails. Enabled by default.

CompactFlash Changes to write-through if CompactFlash memory is not detected during POST, fails during POST, or

fails while the controller is under operation. Enabled by default.

Power Supply Failure Changes to write-through if a power supply unit fails. Disabled by default.

Fan Failure Changes to write-through if a cooling fan fails. Disabled by default.

Over-temperature Failure Forces a controller shutdown if a temperature is detected that exceeds system threshold limits.

Disabled by default.

3. In the Auto-Write Through Cache Behaviors section, either select to enable or clear to disable the options:

Revert when Trigger Condition Clears When enabled, the cache policy changes back to write-back caching after the trigger

condition is cleared. When disabled, the cache policy remains write-through caching after

the trigger condition is cleared. Enabled by default.

Notify Other Controller Notifies the partner controller that a trigger condition occurred. Enable this option to have

the partner also change to write-through mode for better data protection. Disable this

option to allow the partner to continue using its current caching mode for better

performance. In a dual-controller system this option is disabled by default. In Single

Controller mode this option is grayed out.

4. Click Apply. If you disabled Cache Power or CompactFlash, a confirmation prompt appears. Choose Apply to accept the changes, or

Cancel to discard the changes.

Configuring partner firmware update

In a dual-controller system in which partner firmware update is enabled (the default), when you update firmware on one controller, the

system automatically updates the partner controller. Disable partner firmware update only if requested by a service technician.

Change the partner firmware update setting

1. In the System topic, select Action > Advanced Settings > Firmware.

2. Either select (enable) or clear (disable) the Partner Firmware Update option.

3. Click Apply.

Configuring system utilities

The System Utilities tab lets you configure background scrub for disk groups and individual disks, set utility priority, and enable or disable

managed logs.

Configuring background scrub for disk groups

You can enable or disable whether the system continuously analyzes disks in disk groups to find and fix disk errors. This command will fix

parity mismatches for RAID 5 and 6; find but not fix mirror mismatches for RAID 1 and 10. It will not fix media errors.

You can use a disk group while it is being scrubbed. Background disk group scrub runs at background utility priority, which reduces to no

activity if processor usage is above a certain percentage or if I/O is occurring on the disk group being scrubbed. A disk group scrub may be

in process on multiple disk groups at once. A new disk group will first be scrubbed 20 minutes after creation. After a disk group is

scrubbed, scrub will start again after the interval specified by the Disk Group Scrub Interval hours option.

Working in the System topic