Smart Iii Hard Drive Fault Prediction; Ecc Fault Prediction And Prefailure Warranty; Proactive Backup; Surge-Tolerant Power Supply - Compaq AP500 - Professional - 128 MB RAM Reference Manual

SMART III Hard Drive Fault Prediction

SMART III is an extension of SMART II capability. A SMART III hard drive
is able not only to monitor and report on its own health, but to fix problems
before they become failures that result in data losses. The SMART III drive
periodically executes read scans of the entire disk. These read scans take place
during periods of inactivity. During the scan, the disk drive will determine the
"health" of each data sector and move data from any questionable areas of the
disk to known good areas of the disk. To determine the health of the data
during the scan, the drive uses sophisticated methods of Cyclic Redundancy
Codes (CRC) and Error Checking and Correcting (ECC) codes to flag
potentially bad areas of the disk. With today's multi-gigabyte hard drives,
there are areas of the disk that are not read or written by applications for long
periods of time. The SMART III technology will patrol the entire disk so that
when unused or infrequently used parts of the disk are called upon, the data
will be available.

ECC Fault Prediction and Prefailure Warranty

When the workstation encounters an excessive number of error checking and
correcting (ECC) memory errors, the screen displays a Local Alert message.
This message contains detailed information about the errant memory module,
allowing you to take action before you experience non-correctable memory
errors. The Prefailure Warranty for ECC memory modules allows you to
replace these modules, free of charge, before the modules actually fail.

Proactive Backup

Proactive Backup software initiates a tape backup upon receiving notice of an
impending SMART III hard drive failure. Third-party products that provide
this feature include Seagate Backup Exec SMART Client and Cheyenne
SMART Drive Agent.

Surge-Tolerant Power Supply

An integrated surge-tolerant power supply provides greater reliability when
the workstation is hit with an unpredictable power surge. This power supply is
rated to withstand a power surge of up to 2000 volts without incurring any
system downtime or data loss.
Compaq Professional Workstation AP500 Reference Guide
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