HP NonStop G-Series - Manual (Page 47)

Installing and Configuring the Nomadic Disk
Manager
ServerNet Nomadic Disk (Release 2) User’s Guide — 523968-001
3- 13
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
either the internal 46xx disk drives in a pair of I/O enclosures or a pair of up to eight
455mod8 disk modules containing external 45xx disk drives. Each set of internal disk
drives in an I/O enclosure, or external disk drives in one to eight 455mod8 disk
modules, has two switch card paths to it, for a total of four paths per segment. 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 state of the switch
card path when the segment is owned by this node.
P | B | M | MB
specifies the primary (P), backup (B), mirror (M), or mirror backup (MB) switch card
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 has four paths and
four switch cards. A single switch card is directly connected to one, and only one, disk
path.
Do not confuse the switch card paths ( P , B , M , and MB ) configured with the SET PATH
statement with the disk volume paths ( -P , -B , -M , and -MB ) used with Nomadic Disk
Manager commands such as DOWN, RESET, TAKE, and UP. Refer to SCF Reference
Manual for the Storage Subsystem for details on configuring and managing disk
volume paths.
SET PATH { P | B | M | MB } switch slot { STRAIGHT | CROSSED}