User Manual

SCSI Commands Reference Manual, Rev. J 506
www.seagate.com Parameters for direct access devices
5.4.17 SCSI Ports VPD page (88h)
The SCSI Ports VPD page (see table 479) contains designation descriptors for all the SCSI ports in a SCSI target device.
The SCSI Ports VPD page only reports information on SCSI ports known to the device server processing the INQUIRY command. The REPORT
LUNS well-known logical unit (see 3.33) may be used to return information on all SCSI ports in the SCSI device (i.e., all target ports and all
initiator ports).
If the device server detects that a SCSI port is added or removed from the SCSI device and the SCSI port designation descriptor list changes,
then the device server shall establish a unit attention condition (see SAM-5) for the initiator port associated with every I_T nexus, with the
additional sense code set to INQUIRY DATA HAS CHANGED.
PERIPHERAL QUALIFIER and PERIPHERAL DEVICE TYPE fields
The PERIPHERAL QUALIFIER field and PAGE LENGTH field are defined in standard INQUIRY data (see 3.6.2).
Table 479 SCSI Ports VPD page
Bit
Byte
7 6 5 4 3 2 1 0
0 PERIPHERAL QUALIFIER PERIPHERAL DEVICE TYPE
1 PAGE CODE (88h)
2 (MSB)
PAGE LENGTH (n-3)
3 (LSB)
Designation descriptor list
4
SCSI port designation descriptor [first] (see table 480). . .
. . .
SCSI port designation descriptor [last] (see table 480). . .
n