Sense Byte 5–Device Type Code; Sense Byte 6–Content And Format; Sense Bytes 7 Through; Sense Bytes 20 And 21–Subsystem Identifier - IBM Multiprise 3000 Reference Manual

Sense Byte 5–Device Type Code
For exception classes 4 and E this byte contains a code that defines the device
type and model. For 9GB Ultrastar2 XP drives on the Internal Disk Subsystem, the
code is X'3B'. This code is the same as byte 57 of the data returned by the Read
Device Characteristics command (see page 4-54).
If the device model is not known, byte 5 is set to X'3B'.
Byte 5 is zero for exception class 0.
Sense Byte 6–Content and Format
Sense byte 6 indicates the validity of other sense bytes and defines the format of
bytes 7 through 19.
For exception class 0 the value of byte 6 bit 0 should be ignored.

Sense Bytes 7 through 19

The contents of sense bytes 7–14 depend on the format (byte 6, bits 4–7) and the
exception class (byte 22, bits 0–3). See "Sense Data Dependent on Exception
Class" on page 6-10 for descriptions of sense data for the exception classes.
Sense Bytes 20 and 21–Subsystem Identifier
Bytes 20 and 21 contain the SSID(Subsystem Identifier).
Sense Bytes 22 and 23–Exception Code
Byte 22, bits 0–3 contain the exception class. The remainder of bytes 22 and 23
depends on the exception class, and further defines the error. For a summary of
the exception classes, see Table 6-1 on page 6-2. For details on the exception
classes and their formats, see "Sense Data Dependent on Exception Class" on
page 6-10.
6-6
Internal Disk Subsystem Reference Guide
Table 6-3. Byte 6 – 32-Byte Sense
Bit Value Description
0 0 For exception classes 4 and E, the reporting unit is the unit identified
in byte 2.
1 For exception classes 4 and E, the reporting unit is the unit identified
in byte 5.
1 0 The logical volume address in byte 4 is not valid.
1 The logical volume address in byte 4 is valid.
2 0 The track address in bytes 29-31 is not valid.
1 The track address in bytes 29-31 is valid.
3 0 Reserved, set to zero.
4–7 'ffff'b Format.