M2488 PRODUCT GUIDE
TAPE UNIT SCSI COMMANDS
April 1997
CG00000-011503 REV. A
4-19
4-3.6.2
INQUIRY CHECK CONDITION Status
If an INQUIRY command is received from an initiator with a pending unit attention condition (i.e.,
before the target reports CHECK CONDITION status), the target performs the INQUIRY com-
mand and does not clear the unit attention condition. If an INQUIRY command is received after
CHECK CONDITION status has been presented for the unit attention condition, then the unit
attention condition is cleared and the INQUIRY command is performed.
CHECK CONDITION status is only generated for the INQUIRY command when the target can-
not return the requested INQUIRY data due to a hardware error or invalid INQUIRY CDB con-
tents.
Inquiry data is returned to the initiator regardless of the state of the selected LUN (e.g. NOT
READY, Non-Existent).
If the initiator requests a VPD page that is not supported, a CHECK CONDITION status with a
sense key of ILLEGAL REQUEST and an additional sense code of ILLEGAL FIELD in CDB is
returned.
4-3.6.3
Inquiry Data
See section 5-3 for a description of INQUIRY return data when the EVPD bit is 1. The following
Inquiry Data is returned when the EVPD bit = 0:
Table 4-16. EVPD Bit
EVPD BIT
PAGE CODE
BYTE
ACTION
0
00h
When the EVPD bit is zero, the Page Code field must be zero. This returns normal
INQUIRY data. See Table 4-18 for data returned.
0
¼¼not = 00h
If the EVPD bit is zero and the Page Code field is not zero, then the target termi-
nates the command with CHECK CONDITION status, the sense key is set to
ILLEGAL REQUEST, and the ASC/ASCQ is set to INVALID FIELD IN CDB
1
xxh
Specifies that the target return the optional Vital Product Data (VPD) specified by
the Page Code field. See Table 4-17.
Table 4-17. Supported VPD Page Codes
VPD PAGE
CODE
DESCRIPTION
00h
List of the vital product data pages supported by this target.
80h
Unit serial number page.
81h
Implemented operating definition page.
82h
ASCII implemented operating definition page.
C0h
Unit usage page.
Note: This is a vendor unique page containing the tape motion timer and power-on time.
C1h
Configuration page.
C2h
Product identification page.
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