IBM TS2340 User Guide - Page 55

AIX Device Driver (Atape) For example, a default rmt0 logical name for a tape drive could be changed to rmt-0, tape0, or any descriptive name desired. In this example, if the three tape drives are changed to rmt-0, rmt-1, and rmt-2 respectively, and the system is then rebooted with rmt-1 powered off, the HBA detects that there are unique names predefined for the attached devices, and the HBA uses those names. In this case, the devices would configure as follows: rmt-0 rmt-1 rmt-2 target 0, lun 0 target 1, lun 0 target 2, lun 0 Available Defined Available Since rmt-1 is not detected by the HBA but has been predefined at the SCSI ID and LUN ID, it remains in the defined state and is not configured for use, but the next rmt-2 tape drive configures as the same name at the same location after reboot. Using SMIT to Change the Logical Name To change the logical name using SMIT, perform the following steps: 1. Run SMIT from a command line and select Devices. 2. Select Tape Drive. 3. Select Change/Show Characteristics of a Tape Drive. 4. Select the logical device to be changed from the list displayed. 5. In the New Logical Name field, enter a non-AIX default logical name. 6. Press Enter to process the change. Using chdev Command to Change the Logical Name The logical name of a device can be changed using the chdev command. For example, to change the logical name of the device rmt0 to rmt-0, run: chdev -l rmt0 -a new_name=rmt-0 The output of this command displays rmt0 changed. Note: When path failover is enabled, changing the logical name for either a primary or alternate device only changes that individual device name. Control Path Failover Support for Tape Libraries Note: The library control path failover feature code must be installed prior to enabling the path failover support in the Atape device driver. Refer to "Automatic Failover" on page 12 for what feature codes may be required for your machine type. The Atape device driver path failover support configures multiple physical control paths to the same logical library within the device driver and provides automatic failover to an alternate control path when a permanent error occurs on one path. This is transparent to the running application. Configuring and Unconfiguring Path Failover Support Path failover support is not enabled automatically when the device driver is installed. It must be configured initially on each logical device after installation. When path failover support is enabled for a logical device, it remains set until the device is deleted or the support is unconfigured. The alternate path failover setting is retained even if the system is rebooted. Chapter 3. AIX Tape and Medium Changer Device Driver 37