Dell PowerVault 770N (Deskside NAS Appliance) - Manual (Page 31)

After the operation is finished, the console is refreshed and the newly attached disks (if there are any) will appear
under the Array Disk Group object and under the controller object.
Flush
The Flush command forces the PERC 3/DC, 3/QC, 4/Di, and 4/DC controllers to write the contents of cache memory onto the
virtual disks. You might want to use this option if you find your application or disks in an unstable condition.
Enable Alarm
The Enable Alarm command enables the controller alarm setting. When enabled, the alarm sounds in the event of a device
failure.
To enable the alarm sound, perform the following steps:
1. Right-click a controller.
2. Click Enable Alarm.
Disable Alarm
The Disable Alarm command disables the alarm. If disabled, the alarm does not sound in the event of a device failure.
To disable the alarm sound, perform the following steps:
1. Right-click a controller.
2. Click Disable Alarm.
Rebuild Rate
The Rebuild Rate command changes the rebuild rate settings. The rebuild rate is the fraction of the compute cycles
dedicated to rebuilding failed drives. A rebuild rate of 100 percent means the system is totally dedicated to rebuilding the
failed drive.
During a rebuild, the complete contents of an array disk are reconstructed. A rebuild operation can occur during normal
operation; however, it will degrade performance. You can reduce the rebuild rate to maintain system performance during the
rebuild operation; however, a reduced rebuild rate extends the rebuild time.
NOTICE: The default rebuild rate is 30 percent. System performance might be degraded if you change the rebuild rate
to a higher value than the default.
Properties
The Properties command displays controller attributes.
To view properties, perform the following steps:
1. Right-click the appropriate controller.