Filter
Top Products
C141-E124-01EN3 - 10
b. Support
This field indicates the value defined below.
"Support" Bit 2 1 0 Description
0 0 0 Data about the requested SCSI operation code is not currently
available.
0 0 1 The device server does not support the tested SCSI operation
code. All data after byte 1 is undefined.
010Reserved
0 1 1 The device server supports the tested SCSI operation code in
conformance with an SCSI standard.
1 0 0 Vendor-specific (undefined)
1 0 1 The device server supports the tested SCSI operation code in a
vendor-specific manner.
1 1 0 Vendor-specific (undefined)
111Reserved
If the "Support" field contains "000b", all data after byte 1 is not valid. One possible reason
for "support" being "000b" is the device server's inability to retrieve information stored on the
media. When this is the case, a subsequent request for command support data may be
successful.
c. CDB size
This field contains the number of bytes in the CDB for the operation code being queried, and
the size of the "CDB Usage Data" field in the return data.
d. CDB usage data
This field contains information about the CDB for the operation code being queried. The first
byte of the "CDB usage data" contains the operation code for the operation being queried. All
bytes except the first byte of the "CDB usage data" contains a usage map for bits in the CDB
for the operation code being queried.
The bits in the "Usage map" have a one-for-one correspondence to the CDB for the operation
code being queried. If the device server evaluates a bit as all or part of a field in the CDB for
the operation code being queried, the usage map contains a one in the corresponding bit
position. If the device server ignores or treats as reserved a bit in the CDB for the operation
code being queried, the usage map contains a zero in the corresponding bit position. The
usage map bits for a given CDB field all have the same value.
Thus, the CDB usage bit map for this command for a device server that implements command
support data but not vital product data is: 12h, 02h, FFh, 00h, 07h.