IBM TS2340 User Guide - Page 401
Disable and Enable Primary and Alternate Paths (Control Path Failover)
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HP-UX - Tape Utility Program (tapeutil) Where: Xchng is the logical name of any device. This command shows specific information for the primary path and all alternate paths, such as the logical name of the device, the attached host bus adapter, the channel id, the target id, the logical unit number under the target, the current enabled status, and how many paths are configured for the device. Disable and Enable Primary and Alternate Paths (Control Path Failover) When you load the ATDD device driver with the alternate_pathing parameter set to ON, by default, all the available paths for a physical device are enabled. If it is necessary to disable a path and not perform path fail over (for example due to maintenance), run commands to disable and then later enable the primary and alternate paths. Where the -f flag is for the primary path and the -p flag is for the path that you want to enable or disable. This command disables the path: # tapeutil -f /dev/rmt/Xchng -o dis -p /dev/rmt/Xchng -v This command ensures that the path is labeled as ″disabled.″ To enable a path from a disabled state, you can run the following command: # tapeutil -f /dev/rmt/Xchng -o ena -p /dev/rmt/Xchng -v This command enables the path. Querying Primary and Alternate Path Configuration (Data Path Failover) You can display the primary and alternate path configuration for all devices by running ioscan, as explained in section "Primary and Alternate Paths" on page 84. You can also display the primary and alternate path configuration for any device by running the following command: # tapeutil -f /dev/rmt/Xm -o phs -v Where: Xm is the logical name of any device This command shows specific information for the primary path and all alternate paths, such as the logical name of the device, the attached host bus adapter, the channel ID, the target ID, the logical unit number under the target, the current enabled status, and the number of paths configured for the device. Disable and Enable Primary and Alternate Paths (Data Path Failover) Once you load the ATDD device driver with the alternate_pathing parameter set to ON, by default, all the available paths for a physical device are enabled. If for some maintenance reason you need to disable a path and do not want to fail over to this path, then run the following commands: 1. To disable the path: Appendix D. Tape Utility Programs 383