LSI 3ware 9750 User Manual page 294

Chapter 12. Troubleshooting
8020 Enclosure temp normal
8021 Enclosure temp low
282
Action
The enclosure normally controls the on/off function of the fan. If there is no
over-heating problem, no action is necessary.
Event Type
Information.
Cause
Applies to 9750 and 9690SA controllers.
The enclosure temperature is now back within the acceptable range.
Action
None required.
Event Type
Information.
Cause
Applies to 9750 and 9690SA controllers.
The enclosure temperature is lower than normal.
Action
In general, cooler operating temperatures are good for enclosure components.
However, if the temperature is very cold, condensation can occur and cause
media errors and damage. Take steps to bring the operating environment back
within the enclosure manufacturer's specifications.
Allow cold equipment to warm up gradually before powering on.
3ware SATA+SAS RAID Controller Card Software User Guide, Version 10.2