APC RAID Subsystem SCSI-SATA II - Manual (Page 60)

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Figure 3.7.2.1
If “Auto shutdown” has been checked, the system will shutdown automatically
when voltage or temperature is out of the normal range. For better data
protection, please check “Auto Shutdown”.
For better protection and to avoid single short period of high temperature
triggering Auto shutdown, IS16GL use multiple condition judgments for Auto
shutdown, below is the detail of when the Auto shutdown will be triggered.
1. There are 3 sensors placed on controllers for temperature checking, on core
processor, on PCI-X bridge, and on daughter board. IS16GL will check each
sensor every 30 seconds. When one of these sensors is over the high
temperature value for continuous 3 minutes, the Auto shutdown will be
triggered immediately.
2. The core processor temperature limit is 85 . The PCI-X bridge temperature
limit is 80 . The daughter board temperature limit is 80 .
3. If the high temperature situation doesn’t last for 3 minutes, IS16GL will not do
auto shutdown.
3.7.3 Hard drive S.M.A.R.T. function support
S.M.A.R.T. (Self-Monitoring Analysis and Reporting Technology) is a diagnostic
tool for hard drives to give advanced warning of drive failures. S.M.A.R.T.
provides users chances to take actions before possible drive failure.