![](/images/new-backgrounds/1187033/18703339x1.webp)
A temperature sensor monitors the drive temperature and issues a warning over the interface when the temperature exceeds a set threshold. The temperature is measured at
The thermal monitor system generates a warning code of
This feature is controlled by the Enable Warning (EWasc) bit, and the reporting mechanism is controlled by the Method of Reporting Informational Exceptions field (MRIE) on the Informational Exceptions Control (IEC) mode page (1Ch).
The current algorithm implements two temperature trip points. The first trip point is set at 65°C which is the maximum temperature limit according to the drive specification. The second trip point is
Table 1: Temperature Log Page (0Dh)
Parameter Code | Description |
|
|
0000h | Primary Temperature |
|
|
0001h | Reference Temperature |
|
|
5.2.5Drive Self Test (DST)
Drive Self Test (DST) is a technology designed to recognize drive fault conditions that qualify the drive as a failed unit. DST validates the functionality of the drive at a system level.
There are two test coverage options implemented in DST:
1.Extended test
2.Short test
The most thorough option is the extended test that performs various tests on the drive and scans every logical block address (LBA) of the drive. The short test is
If DST encounters an error during either of these tests, it reports a fault condition. If the drive fails the test, remove it from service and return it to Seagate for service.
5.2.5.1DST failure definition
The drive will present a “diagnostic failed” condition through the
The following conditions are considered DST failure conditions:
•Seek error after retries are exhausted
•
•Read error after retries are exhausted
•Write error after retries are exhausted
Recovered errors will not be reported as diagnostic failures.
5.2.5.2Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.5.2.1State of the drive prior to testing
The drive must be in a ready state before issuing the Send Diagnostic command. There are multiple reasons why a drive may not be ready, some of which are valid conditions, and not errors. For example, a drive may be in process of doing a format, or another DST. It is the responsibility of the host application to determine the “not ready” cause.
CONSTELLATION ES.3 SAS PRODUCT MANUAL, REV. B | 15 |