APC RAID Subsystem SCSI-SATA II - Manual (Page 61)

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S.M.A.R.T. measures many attributes of the hard drive all the time and decide
the hard drives which are close to out of tolerance. The advanced notice of
possible hard drive failure can allow users to back up hard drive or replace the
hard drive. This is much better than hard drive crash when it is writing data or
rebuilding a failed hard drive.
Enter “S.M.A.R.T.” function will display S.M.A.R.T. information of hard drives.
The number is the current value; the number in parenthesis is the threshold value.
The threshold values of hard drive vendors are different, please refer to vendors’
specification for details.
Figure 3.7.3.1
3.7.4 UPS
Enter “UPS” function will set UPS (Uninterruptible Power Supply).
Figure 3.7.4.1