SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Configuring and Managing Open SCSI Devices
SCF Reference Manual for the Storage Subsystem—529937-008
12-12
Swapping Processors for an Open SCSI Device
Considerations for SWITCH SCSI
•
You can use this command only on Open SCSI devices that are configured with
dual paths (by using PRIMARYLOCATION and BACKUPLOCATION attributes in
the ADD SCSI command).
•
Use the STATUS SCSI command to verify the path switch.
Example
1. Switch the primary and backup paths of the device:
-> SWITCH $S11500-P
2. Verify the status of the switch:
-> STATUS $S11500
Swapping Processors for an Open SCSI Device
The PRIMARY SCSI Command (page 14-95) swaps the primary and backup
processors for an Open SCSI device. The current primary processor of a specified
device becomes the backup processor, and the backup processor becomes the
primary processor, but the PRIMARYCPU and BACKUPCPU values stay the same.
You typically swap processors when load balancing the system or preparing for device
replacement.
Examples
•
To execute the primary process of $DEV1 in processor 3 (assuming it is configured
to run in processor 3):
-> PRIMARY $DEV1, 3
•
To make the current backup process of $DEV1 the primary process:
-> PRIMARY $DEV1