IBM TS2340 User Guide - Page 95

HP-UX Device Driver (ATDD) Driver-Specific Parameters Some of the configuration parameters are device-specific, while others are driver-specific. Table 10 shows the parameters that are driver-specific, what they mean, and their values. Table 10. Driver-Specific Parameters (Global) Parameter Meaning INSTANCE ATDD Device Number DEVICES Number of Configured Devices MINPHYS Check/Adjust Transfer Count (Precision Bus Driver only) Values (Read Only) (Read Only) v 0=Use OMI minphys v 1=Use HP-UX minphys Modifying Configuration Parameters To change a configuration parameter, use the atdd_cfg program located in /opt/OMImag/bin for the PB driver and in /opt/atdd/bin for the PCI driver. You can update the current value. v In HP-UX 11.0, 11i v1 and v2: For example, if you want to change the COMPRESSION parameter to 0 for the device at hardware path 0/4/0/0.1.0, do the following: # atdd_cfg -g INSTANCE 0/4/0/0.1.0 INSTANCE: 2 The ATDD instance number for this device is returned. You must use this INSTANCE value (1) to set the COMPRESSION value for this device. # atdd_cfg -s COMPRESSION 0 2 Or, to get or modify COMPRESSION by using the hardware path: # atdd_cfg -g COMPRESSION 0/4/0/0.1.0 # atdd_cfg -s COMPRESSION 0 0/4/0/0.1.0 v In HP-UX 11i v3: The usage of atdd_cfg command is: atdd_cfg -d special_file [-o parameter [-w value]] All configurable parameters for the specified device are displayed by entering #atdd_cfg -d special_file only For instance: # /opt/atdd/bin/atdd_cfg -d /dev/rtape/tape14_BEST DENSITY=0 SILI=1 BLOCKSIZE=0 COMPRESSION=1 BUFFERING=1 REWIND_IMMEDIATE=0 TRAILER=1 SCALING=0 WRITEPROTECT=0 ERRNO_LEOT=28 WFM_IMMEDIATE=0 RESERVE=1 PRE_V3_COMPAT=0 To display a specific parameter, run #atdd_cfg -d special_file -o parameter For example, Chapter 4. HP-UX Tape and Medium Changer Device Driver 77