Table 2–6 (Cont.) PARAMS Configuration Utility HSD05 Array Controller
Parameters
Parameter
Name
Definition
WT_PROTECTED
Enables/disables write protection for each SCSI ID. When disabled
(set to 0), it allows read-write access to a SCSI ID, and when
enabled, it restricts access to read only. This parameter is in the
form of a boolean matrix, with the leftmost position representing a
SCSI ID of 7, and the rightmost position representing a SCSI ID
of 0. For example, a WT_PROTECTED setting of 00000001 allows
read-write access to SCSI IDs 1 through 7 and read only access to
SCSI ID 0. The factory default for this parameter is 00000000 (no
devices write protected).
ONLINE
Controls whether devices are on line or off line to the host. This
parameter is in the form of a boolean matrix, with the leftmost
position representing SCSI ID=7, and the rightmost position
representing SCSI ID=0. For example, a WT_PROTECTED setting
of 10000000 sets SCSI IDs 0 through 6 off line and SCSI ID 7 on
line. The factory default for this parameter is 11111111 (all devices
on line).
NAME_ALGRM
This parameter is fully described in The NAME_ALGRM Parameter.
SCSI_ID_X
Used in conjunction with the NAME_ALGRM parameter to set
alternative device names for each SCSI ID.
The NAME_ALGRM Parameter
The NAME_ALGRM parameter toggles between the HSD05 array controller’s
standard device naming convention and an alternative convention based upon the
TMSCP/MSCP unit number. When NAME_ALGRM is set to the default of 0, the
HSD05 array controller uses its standard naming algorithm, which assigns a unit
number composed of the DSSI ID of the HSD05 array controller according to the
following parameters:
•
Unit offset
—A unique number (0 - 9) for each host DSSI bus. This
parameter can be used to modify bus numbering conflicts in multiple DSSI
bus configurations.
•
DSSI ID
—The DSSI device address for the HSD05 array controller.
•
SCSI ID
—The SCSI device address for the storage device. This is set by
either the device’s shelf slot position or by ID switches on the device.
•
SCSI logical unit number
—The device address of a subdevice attached to a
SCSI device identified by SCSI ID
x
.
Setting NAME_ALGRM to 1 activates the alternative naming algorithm, which
assigns a unit number in conjunction with the SCSI_ID_X parameter. These two
conventions are summarized as follows:
Preparing to Use the HSD05 Array Controller 2–15
