ServerNet Nomadic Disk User's Guide

Installing and Configuring the Nomadic Disk
Manager
ServerNet Nomadic Disk User’s Guide—425485-001
3-11
Nomadic Disk Manager Configuration Statements
ADD SEGMENT Statement
The ADD SEGMENT statement adds the definition of a segment to the configuration.
seg
specifies the name of a segment you want to add to the configuration file. You can
use any valid TACL variable name.
DATA
specifies that the segment has Nomadic Disk data and is not a SPARE segment.
SPARE
Do not use this parameter.
Considerations
•
Although spare segments are used with spare disk modules in NonStop Himalaya
K-series servers, spare disk modules are not currently supported for the ServerNet
Nomadic Disk subsystem; therefore, the SPARE parameter should not be used with
NonStop Himalaya S-series servers.
•
A segment represents a pair of 45xx disk modules:
°
One disk module is located at the primary node and contains the primary
volumes.
°
The other disk module is located at the backup node and contains the mirror
volumes.
•
A segment can have from one to eight mirrored volumes.
•
The attributes of the segment must have been previously specified by SET PATH
and SET VOL statements. The SET PATH and SET VOL statements modify a
segment template; the ADD SEGMENT statement uses the data in that segment
template. The ADD SEGMENT statement implicitly resets the segment template.
•
All data segments are normally switched between nodes as a group. This feature can
be overridden, but an override should be attempted only in an emergency.
ADD SEGMENT seg , { DATA | SPARE }