DEC 4000 600 series, Руководство пользователя, Страница: 164 / 242

Setting and Examining Parameters for DSSI Devices
Setting and Examining Parameters for DSSI Devices
When to
Change
DSSI Device
Parameters You may need to change DSSI device parameters under the
following circumstances:
• If you reconfigure your system to include DSSI devices in an
expander
• If you create a DSSI VMScluster configuration
Changing
DSSI Device
Parameters:
Rules
Use the following rules to decide how to renumber your DSSI
storage devices:
• For each DSSI bus, do not duplicate drive ID numbers for
storage devices/adapters. For Bus A, you can have only
one storage device identified as drive 0, one storage device
as drive 1, and so on; for Bus B, you can have only one
storage device identified as drive 0, one storage device as
drive 1, and so on. (See the previous section, Changing Drive
ID Numbers, for information about changing a drive’s ID
number.)
• When more than one DSSI bus is being used and the system
is using a nonzero allocation class, you need to assign new
MSCP unit numbers for devices on all but one of the DSSI
buses. This is necessary because the unit numbers for all
DSSI devices connected to a system’s associated DSSI buses
must be unique.
Using cdp and
show device du
pu Commands You set and examine DSSI device parameters by using the show
device du pu and cdp console commands:
•
show device du pu
— Displays information for each DSSI
device on the system (
du
specifies drives,
pu
specifies storage
adapters).
•
cdp
— Allows you to modify the following device parameters
from console mode: NODENAME, ALLCLASS, and
UNITNUM. The
cdp
command automatically connects
to the device’s DUP driver for all devices or any number of
specified devices.
6–24 System Configuration