Apple Xserve RAID: Using RAID 1.2 Admin and Disk Utility - Manual (Page 33)

Chapter 3 Monitoring Status and Changing Settings 33
Using System Commands
System commands are useful for system installation, maintenance, and
troubleshooting. These commands are located in the System menu of RAID Admin.
The system commands include:
• Shutdown, which puts the system into standby power mode. When you shut down a
system, the data held in all caches is safely written to disk before the system powers
off.
Note: Use the Shutdown command or the Power button on the Xserve RAID system
to safely write all data in the caches to disk and power off the system. If you power
off the system by removing power (unplugging a cord, for example), the data in the
caches is not written to disk and you can experience data loss. Also, if the optional
cache backup batteries are installed, removing power will cause the system to think
there is a power failure and begin discharging the batteries that protect the contents
of the controller cache.
• Power Up, which starts up the system when it is in standby mode.
• Restart the Upper or Lower RAID Controller. These commands should only be used
when troubleshooting the RAID controller. Restarting the RAID controller will disrupt
the availability of your data.
• Restart the Upper or Lower Management Coprocessor. These commands should only
be used when troubleshooting communications problems between RAID Admin and
the Xserve RAID system. Restarting a coprocessor will not affect data availability.
Important: Restarting both the upper and lower coprocessors within 30 seconds of
each other may cause your Xserve RAID system to go into standby power mode. If
you ever need to restart both coprocessors, wait at least 30 seconds after restarting
the first to restart the second.
Note: Use the Restart system commands with care, because any of them may disrupt
the orderly transmission and storage of data.
• Clear Error Status. This command clears the alarm indicator on an Xserve RAID
system after it has detected a problem and the problem has been corrected. When a
problem is detected, the Xserve RAID system blinks the system identifier light,
sounds the audible alarm (if enabled), and sends an email notification (if enabled).
Until the error status is cleared, by either choosing Clear Error Status or pressing the
system identifier button on the system, the Xserve RAID system will not send further
email notifications or sound the alarm for problems of the same type or with the
same component.
• Clear Event Log. This command clears the contents of the event log.
• Forget Management Password. This command deletes the saved management
password.
• Update Now. This command gets the current status for the system and its
components.