Seagate ST9900805SS Savvio 10K.1 SCSI Product Manual - Page 28

Temperature Log Dh

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can be used to set this trip point. The default value for this drive is 68°C, however, you can set it to any value in the range of 0 to 68°C. If you specify a temperature greater than 68°C in this field, the temperature is rounded down to 68°C. A sense code is sent to the host to indicate the rounding of the parameter field. Table 11: Temperature Log page (0Dh) Parameter Code 0000h 0001h Description Primary Temperature Reference Temperature When the first temperature trip point is exceeded, S.M.A.R.T. data is collected and a frame is saved to the disc. 5.2.9 Drive 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 text 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 time-restricted and limited in length-it does not scan the entire media surface, but does some fundamental tests and scans portions of the media. 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. 5.2.9.1 DST Failure Definition The drive will present a "diagnostic failed" condition through the self-tests results value of the diagnostic log page if a functional failure is encountered during DST. The channel and servo parameters are not modified to test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number of retries required to recover the data. The following conditions are considered DST failure conditions: • Seek error after retries are exhausted • Track-follow 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. 5.2.9.2 Implementation This section provides all of the information necessary to implement the DST function on this drive. 5.2.9.2.1 State 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. 22 Savvio SCSI Product Manual, Rev. D

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22
Savvio SCSI Product Manual, Rev. D
can be used to set this trip point. The default value for this drive is
68°C, however, you can set it to any value in
the range of 0 to 68°C. If you specify a temperature greater than 68°C in this field, the temperature is rounded
down to
68°C. A sense code is sent to the host to indicate the rounding of the parameter field.
When the first temperature trip point is exceeded, S.M.A.R.T. data is collected and a frame is saved to the disc.
5.2.9
Drive 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 text
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 time-restricted and limited in length—it does not scan the
entire media surface, but does some fundamental tests and scans portions of the media.
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.
5.2.9.1
DST Failure Definition
The drive will present a “diagnostic failed” condition through the self-tests results value of the diagnostic log
page if a functional failure is encountered during DST. The channel and servo parameters are not modified to
test the drive more stringently, and the number of retries are not reduced. All retries and recovery processes
are enabled during the test. If data is recoverable, no failure condition will be reported regardless of the number
of retries required to recover the data.
The following conditions are considered DST failure conditions:
•
Seek error after retries are exhausted
•
Track-follow 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.
5.2.9.2
Implementation
This section provides all of the information necessary to implement the DST function on this drive.
5.2.9.2.1
State 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.
Table 11:
Temperature Log page (0Dh)
Parameter Code
Description
0000h
Primary Temperature
0001h
Reference Temperature