SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001server shall return CHECK CONDITION status and shall set the sense key to ILLEGAL REQUEST with anadditional sense code of INVALID FIELD IN CDB.7.26.9 Write data to echo buffer (1010b)In this mode the device server transfers data from the application client and stores it in an echo buffer. An echobuffer is assigned in the same manner by the target as it would for a write operation. Data shall be sent aligned onfour-byte boundaries. The BUFFER ID and BUFFER OFFSET fields are ignored in this mode.NOTE 39 It is recommended that the target assign echo buffers on a per initiator basis to limit the number ofexception conditions that may occur in a multi-initiator environment.Upon successful completion of a WRITE BUFFER command the data shall be preserved in the echo buffer unlessthere is an intervening command to any logical unit in which case it may be changed.The PARAMETER LIST LENGTH field specifies the maximum number of bytes that shall be transferred from theData-Out Buffer to be stored in the echo buffer. The application client should attempt to ensure that the parameterlist length does not exceed the capacity of the echo buffer. The capacity of the echo buffer may be determined bythe BUFFER CAPACITY field in the READ BUFFER echo buffer descriptor. If the PARAMETER LIST LENGTH fieldspecifies a transfer in excess of the buffer capacity, the device server shall return CHECK CONDITION status andshall set the sense key to ILLEGAL REQUEST with an additional sense code of INVALID FIELD IN CDB.168 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 208 Parameters for all device types8.1 Diagnostic parameters8.1.1 Diagnostic page format and page codes for all device typesThis subclause describes the diagnostic page structure and the diagnostic pages that are applicable to all SCSIdevices. Pages specific to each device type are described in the command standard (see 3.1.12) that applies tothat device type.A SEND DIAGNOSTIC command with a PF bit of one specifies that the SEND DIAGNOSTIC parameter listconsists of zero or more diagnostic pages and that the data returned by the subsequent RECEIVE DIAGNOSTICRESULTS command shall use the diagnostic page format defined in table 120. A RECEIVE DIAGNOSTICRESULTS command with a PCV bit of one specifies that the device server return a diagnostic page using the formatdefined in table 120.Table 120 — Diagnostic page formatBitByte7 6 5 4 3 2 1 00 PAGE CODE1 Reserved2 (MSB)PAGE LENGTH (n-3)3 (LSB)4Diagnostic parametersnEach diagnostic page defines a function or operation that the device server shall perform as a result of a SENDDIAGNOSTIC command or the information being returned as a result of a RECEIVE DIAGNOSTIC RESULTS withthe PCV bit equal to one. The page contains a page header followed by the data that is formatted according to thepage code specified.Device servers that implement diagnostic pages are only required to accept a single diagnostic page percommand.dpANS SCSI Primary Commands - 2 (SPC-2) 169
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