SCSI Primary Commands - 2.pdf

18 July 2001 T10/1236-D Revision 20If an INQUIRY command is received from an initiator with a pending unit attention condition (i.e., before the deviceserver reports CHECK CONDITION status), the device server shall perform the INQUIRY command and shall notclear the unit attention condition (see SAM-2).The INQUIRY data should be returned even though the device server is not ready for other commands. Tominimize delays after a hard reset or power-up condition, the standard INQUIRY data should be available withoutincurring any media access delays. If the device server does store some of the INQUIRY data on the media, it mayreturn zeros or ASCII spaces (20h) in those fields until the data is available from the media.The INQUIRY data may change as the target executes its initialization sequence. For example, the target maycontain a minimum command set in its nonvolatile memory and may load its final firmware from the media when itbecomes ready. After the target has loaded the firmware, it may support more options and therefore returndifferent supported options information in the INQUIRY data.If the standard INQUIRY data changes for any reason, the device server shall generate a unit attention condition forall initiators (see SAM-2). The device server shall set the additional sense code to INQUIRY DATA HASCHANGED. If INQUIRY VPD data changes for any reason, the device server may generate a unit attentioncondition for all initiators (see SAM-2), setting the additional sense code to INQUIRY DATA HAS CHANGED.NOTE 12 The INQUIRY command may be used by an application client after a hard reset or power-up condition todetermine the device types for system configuration.dpANS SCSI Primary Commands - 2 (SPC-2) 81