Fujitsu MBA3073RC, MBC2036RC Smart Self-Monitoring Analysis and Reporting Technology, Overview

Disk Media Management

7.6 SMART (Self-Monitoring Analysis and Reporting Technology)

7.6.1 Overview

The SMART function of the HDD monitors events that represent signs of HDD deterioration or failure. The HDD monitors the following metrics (attributes):

∙Read error rate

∙Write error rate

∙Seek error rate

∙Number of remaining alternate sectors

∙Spin-up time

∙G-list update frequency

∙Device temperature

(High-temperature state, rather than failure prediction, is reported.)

The HDD always monitors events that represent signs of deterioration or failure, and collects data about such events. Data that will be used as the basis for failure prediction is generally stored in memory during ordinary service operation to prevent a reduction in HDD performance. Should the data in memory be lost at power-off, however, the data collected in memory is written and saved to disk media at certain time intervals or when a specific operation is performed. When the power is turned on again, the data that was written to the disk most recently is read and loaded into memory, and then data collection for failure prediction resumes.

If reading statistical information from disk media fails at subsequent power-on, no transition is made to the ready state. In this case, the error reported is Logical Unit Failed Self-configuration [=4C/xx]. If an error occurs while statistical information is being written to a disk, no error is reported except when the LOG SELECT or LOG SENSE command is issued.

The statistical data on the disk is updated under any of the following conditions:

(1)When a LOG SENSE or LOG SELECT command is executed with the "SP" bit set to "1"

(2)When an accounting year/week (Log Page 0E) is specified in the LOG SELECT command

(3)When the LOG SELECT command specifies an application client log (Log Page 0F)

(4)Immediately after control, statistical, and other information are read completely from the media after power-on

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