IBM TS2340 User Guide - Page 168

Solaris Device Driver (IBMtape) example in Figure 13. #tapelist -1 Inst# Special File Device Serial No TGT/LUN Ucode WWNN WWPN Device Physical Path Path Type 686 /dev/rmt/12smc 03584L32 0000000T0039 1/1 402j N/A N/A /devices/pci@If,2000/QLGC,qla@1/IBMtape@1,1 Primary 688 /dev/rmt/14smc 03584L32 0000000T0039 2/1 402j N/A N/A /devices/pci@If,2000/QLGC,qla@1/IBMtape@2,1 Alt_path_1 694 /dev/rmt/26smc 03584L32 0000000T0039 5/1 402j N/A N/A /devices/pci@If,2000/QLGC,qla@1/IBMtape@5,1 Alt_path_2 Figure 13. Example of Control Path Failover Support Command Output The labeling of a logical device as either a primary or alternate path is for information only; it is used to: 1. Identify the actual number of physical devices configured on the system and a specific logical device associated with them. There is only one logical device labeled the primary path for each physical device. However, there can be multiple logical devices labeled as an alternate path for the same devices. 2. Provide information about which logical devices configured on the system have path failover enabled. Querying Primary and Alternate Path Configuration You can display the primary and alternate path configuration for all devices with the tapelist utility. Note: Display the primary and alternate path configuration for any device using tape diagnostic and utility functions, refer to Chapter 10, "IBM Tape Diagnostic Tool (ITDT)," on page 259 or "Solaris System - Tape Utility Program (tapeutil)" on page 397. Disable and Enable Primary and Alternate Paths Once you install the IBMtape device driver, by default, all the available paths for a physical device are enabled. Note: Display the primary and alternate path configuration for any device using tape diagnostic and utility functions, refer to Chapter 10, "IBM Tape Diagnostic Tool (ITDT)," on page 259 or "Solaris System - Tape Utility Program (tapeutil)" on page 397. Data Path Failover and Load Balancing Support for Tape Drives Note: The tape drive failover feature code must be installed prior to enabling the DPF for IBM Ultrium tape drive in the Solaris IBMtape device driver. Refer to "Automatic Failover" on page 12 to determine which feature code is required for your machine type. Configuring and Deconfiguring Path Failover Support Path failover support for tape drives 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 150 IBM Tape Device Drivers Installation and User's Guide