IBM TS2340 User Guide - Page 170
Primary and Alternate Paths, Querying Primary and Alternate Path Configuration, Diagnostic Tool ITDT
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Solaris Device Driver (IBMtape) 3. Stop the TMD (tape monitor daemon) running on the system and unload the IBMtape driver module from the current kernel: # /opt/IBMtape/tmd -s # /usr/sbin/rem_drv IBMtape 4. Reload the IBMtape driver module in the kernel and start the daemon: # /usr/sbin/add_drv -m ' 0666 bin bin' IBMtape # /opt/IBMtape/tmd Primary and Alternate Paths When the device driver configures a logical device with path failover support enabled, the first device configured always becomes the primary path. When a second logical device is configured with path failover support enabled for the same physical device, it configures as an alternate path. A third logical device is configured as the next alternate path, and so on. The device driver supports up to 16 physical paths for a single device. For example, if 0st (port 0 of 3592) is configured first, then 5st (port 1), 18st (port 1) and 21st (port 0) to the two HBAs through a switch (here, WWPN 5005076302400127 from port 0 and 5005076302800127 from port 1), the /opt/IBMtape/tapelist command output is similar to the example in Figure 14. #tapelist -1 Inst# Special File Device Serial No TGT/LUN Ucode WWNN WWPN Device Physical Path Path Type 685 /dev/rmt/0st 03592J1A 000001300168 1/0 04CE 5005076302000127 5005076302400127 /devices/pci@1f,2000/QLGC,qla@1/IBMtape@1,0 Primary 697 /dev/rmt/5st 03592J1A 000001300168 7/0 04CE 5005076302000127 5005076302800127 /devices/pci@1f,2000/QLGC,qla@1/IBMtape@7,0 Alt_path_1 666 /dev/rmt/18st 03592J1A 000001300168 1/0 04CE 5005076302000127 5005076302800127 /devices/pci@1f,4000/JNI,FCR@2/IBMtape@1,0 Alt_path_2 670 /dev/rmt/21st 03592J1A 000001300168 3/0 04CE 5005076302000127 5005076302400127 /devices/pci@1f,4000/JNI,FCR@2/IBMtape@3,0 Alt_path_3 Figure 14. Example of Data Path Failover Support Command Output The labeling of a logical device as either a primary or alternate path is for information only, in order to: 1. Be able to 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 may be many (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 support 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. 152 IBM Tape Device Drivers Installation and User's Guide
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