Device Identification Page (83H) - Seagate SCSI Interface Product Manual

SCSI Interface Product Manual, Rev. J
[2] Page 81h defines the current operating definition, the default operating definition, and which operating
definitions are implemented by the drive. These operating definition values are specified in the Change
Definition command (see Table 36).
[3] The Page Length field specifies the length of the following operating definitions. If the Allocation Length of
the command descriptor block is too small to transfer all of the page, the Page Length shall not be
adjusted to reflect the truncation.
[4] The Current Operating Definition field returns the value of the present operating definition. The default
operating definition field returns the value of the operating definition the drive uses when power is applied
if no operating definition is saved (see Table 56).
Table 56: Operating Definition Field
Code Operating description
00h Use Current Operating Definition
01h SCSI X3.131-1986 Operating Definition
03h SCSI-2 X3.131-199x Operating Definition
[5] For each operating definition there is an associated Save Implemented (SAVIMP) bit. A SAVIMP bit of
zero indicates that the corresponding operating definition parameter cannot be saved. A SAVIMP bit of
one indicates that the corresponding operating definition parameter can be saved. The drive saves the
default operating definition and all supported operating definitions.
5.6.5

Device Identification page (83h)

The Device Identification page (Table 57) provides the means to retrieve zero or more identification descriptors
applying to the logical unit. Logical units may have more than one identification descriptor (e.g., if several types
or associations of identifier are supported).
Device identifiers, if any, shall be assigned to the peripheral device (e.g., a disk drive) and not to the currently
mounted media, in the case of removable media devices. Media identification is outside the scope of this man-
ual. Operating systems are expected to use the device identifiers during system configuration activities to
determine whether alternate paths exist for the same peripheral device.
Note. In the case of virtual logical units (e.g., volume sets as defined by SCC, SCSI-3 Controller Com-
mands), the Identifier field (see Table 58) should be an IEEE Registered Extended name. The IEEE
Registered Extended name has a code of 3h in the Identifier type field and an NAA value of 0110b as
defined in FC-PH.
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