ServerNet Nomadic Disk User's Guide

Installing and Configuring the Nomadic Disk
Manager
ServerNet Nomadic Disk User’s Guide—425485-001
3-14
Nomadic Disk Manager Configuration Statements
SET PATH Statement
The SET PATH statement modifies the segment template to be used by a subsequent
ADD SEGMENT statement. A segment, as defined by the Nomadic Disk Manager, is a
pair of 45xx modules. Each 45xx module has two paths to it, so a segment has four
paths. Use the SET PATH statement to:
•
Associate a switch card with one of the four paths to a segment.
•
Specify which position, STRAIGHT or CROSSED, defines the path owned by this
node.
P | B | M | MB
specifies the primary (P), backup (B), mirror (M), or mirror backup (MB) path of
the module at the primary site.
switch
specifies the device name of a switch module.
slot
is the slot number of a switch card within the switch module, which can contain up
to eight switch cards. Acceptable values are integers in the range 1 through 8.
STRAIGHT
specifies the switch connections: J1 to J2 and J3 to J4.
CROSSED
specifies the switch connections: J1 to J4 and J2 to J3.
Considerations
The number of switch cards required is equal to the total number of physical disk paths.
A configuration with one ServerNet Nomadic Disk segment (two modules) has four
paths and four switch cards. A single switch card is directly connected to one, and only
one, disk path.
Example
The following is an example of fully configured paths for a segment. A segment must
have at least one path specified, or else a subsequent ADD SEGMENT command is not
allowed.
SET PATH P $SM01.#A 1 STRAIGHT
SET PATH B $SM01.#A 2 STRAIGHT
SET PATH M $SM02.#A 1 CROSSED
SET PATH MB $SM02.#A 2 CROSSED
SET PATH { P | B | M | MB } switch slot { STRAIGHT | CROSSED}