5.5 HP StorageWorks X9720 Network Storage System Administrator Guide (AW549-96026, March 2011)

CAUTION:
To properly ventilate the system, you must provide at least 7.6 centimeters (3.0 inches) of clearance
at the front and back of the device.
CAUTION:
When replacing hot-pluggable components in an operational X9720 Network Storage System, allow
approximately 30 seconds between removing the failed component and installing the replacement.
This time is needed to ensure that configuration data about the removed component is cleared from
the system registry. To minimize airflow loss, do not pause for more than a few minutes. To prevent
overheating due to an empty chassis bay, use a blanking panel or leave the slightly disengaged
component in the chassis until the replacement can be made.
CAUTION:
Schedule physical configuration changes during periods of low or no activity. If the system is performing
rebuilds, RAID migrations, array expansions LUN expansions, or experiencing heavy I/O, avoid
physical configuration changes such as adding or replacing hard drives or hot-plugging a controller
or any other component. For example, hot-adding or replacing a controller while under heavy I/O
could cause a momentary pause, performance decrease, or loss of access to the device while the new
controller is starting up. When the controller completes the startup process, full functionality is restored.
CAUTION:
Before replacing a hot-pluggable component, ensure that steps have been taken to prevent loss of
data.
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