IBM TS2340 User Guide - Page 96
Configurable Kernel Parameters Tunable, atdd_cfg -h
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HP-UX Device Driver (ATDD) #/opt/atdd/bin/atdd_cfg -d /dev/tape/tape14_BESTn -o COMPRESSION COMPRESSION=1 To set a specific parameter, run #atdd_cfg -d special_file -o parameter -w value For example, # atdd_cfg -d /dev/rtape/tape14_BESTn -o COMPRESSION -w 0 Success To set a new BOOT default value for the configuration parameter, you must modify or add an entry in the atdd.cfg configuration file located in /etc/rc.config.d for the static driver or the atdd configuration file located in /sbin/init.d. For example, if you want the COMPRESSION default set to 0 for the device at ATDD_HWPATH[0] or tape14_BESTn, add the following line to your configuration file: v In HP-UX 11.0, 11i v1 and v2: ATDD_COMPRESSION[0]=0 v In HP-UX 11i v3: /opt/atdd/bin/atdd_cfg -d /dev/rtape/tape14_BESTn -o COMPRESSION -w 0 Note: The configuration parameters are prefixed with ATDD_ in the configuration file. For additional instructions about using the configuration program, use the -h option as follows: # atdd_cfg -h Configurable Kernel Parameters (Tunable) ATDD provides the following variety of configurable kernel parameters that allow the users to customize for specific setup: v atdd_log_trace Log the sense data in syslog when a hardware or medium error is occurred, see "Sense Data Logging" on page 86 for additional details. This parameter is enabled by default on 11i v3 and later, but disabled by default in 11iv3 and earlier. v alternate_pathing/atdd_alternate_pathing Enable or disable the alternate path support for CPF/DPF (see the specific operating system section that covers CPF and DPF support for detail). This parameter is enabled by default. v atdd_disable_reserve/atdd_disable_res Allows the user to disable the reservation management from ATDD. This parameter off by default. v atdd_loadbalance Allows the user to disable automatic load balancing from ATDD. This parameter is On (1) by default and supported on 11iv3 only v atdd_reserve_type The drive is reserved in the SCSI-2 Reserve command when Data Path Failover (DPF) is disabled by default. To reserve the drive using Persistent Reserve In and Out commands, the user can set the value of atdd_reserve_type to 3. The default value for the tunable: 1 - Reserve(6) command; 2 - Reserve(10) command (Unsupported); 3 - Persistent Reserve In/Out commands 78 IBM Tape Device Drivers Installation and User's Guide