SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001The device server shall reject unsupported values unless rounding is permitted in the description of the parameter.When the description of a parameter states that rounding is permitted, the device server should adjustmaximum-value fields down to the next lower supported value than the one specified by the application client.Minimum-value fields should be rounded up to the next higher supported value than the one specified by the applicationclient. In some cases, the type of rounding (up or down) is explicitly specified in the description of theparameter.5.4 Self-test Operations5.4.1 Default self-testThe SEND DIAGNOSTIC command provides a means to request that a SCSI device perform a self test. While thetest is vendor specific, the means of requesting the test is standardized.The default self-test is mandatory for all device types that support the SEND DIAGNOSTICS command. Theresponse is GOOD status if the test detects no exceptions or a CHECK CONDITION status if the test detectsexceptions.5.4.2 The short and extended self-testsThere are two optional types of self-test aside from the mandatory default self-test that may be invoked using theSELF-TEST CODE field in the SEND DIAGNOSTICS command: a short self-test and an extended self-test. The goalof the short self-test is to quickly identify if the logical unit determines that it is faulty. A goal of the extendedself-test routine is to simplify factory testing during integration by having logical units perform more comprehensivetesting without application client intervention. A second goal of the extended self-test is to provide a more comprehensivetest to validate the results of a short self-test, if its results are judged by the application client to be inconclusive.The criteria for the short self-test are that it has one or more segments and completes in two minutes or less. Thecriteria for the extended self-test are that it is has one or more segments and that the completion time is vendorspecific. Any tests performed in the segments are vendor specific.The following are examples of segments:a) An electrical segment wherein the logical unit tests its own electronics. The tests in this segment arevendor specific, but some examples of tests that may be included are: a buffer RAM test, a read/writecircuitry test, and/or a test of the read/write head elements;b) A seek/servo segment wherein a device tests it capability to find and servo on data tracks; andc) A read/verify scan segment wherein a device performs read scanning of some or all of the mediumsurface.The tests performed in the segments may be the same for the short and extended self-tests. The time required bya logical unit to complete its extended self-test is reported in the EXTENDED SELF-TEST COMPLETION TIME field in theControl mode page (see 8.3.6).5.4.3 Self-test modesThere are two modes for short and extended self-tests: a foreground mode and a background mode. These modesare described in 5.4.3.1 and 5.4.3.2.20 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 205.4.3.1 Foreground modeWhen a device server receives a SEND DIAGNOSTICS command specifying a self-test to be performed in theforeground mode, the device server shall return status for that command after the self-test has been completed.While performing a self-test in the foreground mode, the device server shall respond to all commands exceptINQUIRY, REPORT LUNS, and REQUEST SENSE with a CHECK CONDITION status, a sense key of NOTREADY and an additional sense code of LOGICAL UNIT NOT READY, SELF-TEST IN PROGRESS.If a device server is performing a self-test in the foreground mode and a test segment error occurs during the test,the device server shall update the self-test results log page (see 8.2.8) and report CHECK CONDITION status witha sense key of HARDWARE ERROR and an additional sense code of LOGICAL UNIT FAILED SELF-TEST. Theapplication client may obtain additional information about the failure by reading the self-test results log page. If thedevice server is unable to update the self-test results log page it shall return a CHECK CONDITION status with asense key of HARDWARE ERROR and an additional sense code of LOGICAL UNIT UNABLE TO UPDATESELF-TEST LOG.An application client should reserve the logical unit before initiating a self-test in the foreground mode. An applicationclient may terminate a self-test that is being performed in the foreground mode using an ABORT TASK,ABORT TASK SET, or CLEAR TASK SET task management function. If a task manager receives an ABORT TASK,ABORT TASK SET, or CLEAR TASK SET task management function while performing a self-test in the foregroundmode, then it shall abort the self-test and update the self-test results log page (see 8.2.8).5.4.3.2 Background modeWhen a device server receives a SEND DIAGNOSTICS command specifying a self-test to be performed in thebackground mode, the device server shall return status for that command as soon as the CDB has been validated.After returning status for the SEND DIAGNOSTICS command specifying a self-test to be performed in thebackground mode, the device server shall initialize the self-test results log page (see 8.2.8) as follows. Theself-test code from the SEND DIAGNOSTICS command shall be placed in the SELF-TEST CODE field in the log page.The SELF-TEST RESULTS field shall be set to Fh. After the self-test results log page is initialized, the device servershall begin the first self-test segment.While the device server is performing a self-test in the background mode, it shall terminate with a CHECKCONDITION status any SEND DIAGNOSTICS command it receives that meets one of the following criteria:a) The SELFTEST bit is one; orb) The SELF-TEST CODE field contains a value other than 000b or 100b.When terminating the SEND DIAGNOSTICS command, the sense key shall be set to NOT READY and theadditional sense code shall be set to LOGICAL UNIT NOT READY, SELF-TEST IN PROGRESS.dpANS SCSI Primary Commands - 2 (SPC-2) 21
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