User Guide

6-44 Ampex 1308911-02
Model No.
Running Head
dd2_set_drive DD-2 Utilities Manual Pages
sctime The Scanner Timeout parameter specifies (in minutes) how long the
tape drive idles before stopping scanner rotation after a thread
timeout. The default is 5. The range is 0-30.
thtime The Thread Timeout parameter specifies (in seconds) how long the
tape drive idles before doing a park and unthread operation. The
park location is determined by the Park Anywhere configuration
parameter. The default is 30. The range is 6-30.
To view the current state of the Park Anywhere configuration
parameter, use the dd2_query_drive utility.
ewoffset The Early Warning (EW) parameter controls the position of early
warning relative to the physical End of Partition (EOP). It is
measured in physical blocks (each physical block is approximately
1.2 megabytes). The default is 100. The range is 0-16777215.
clntime The Cleaning Time parameter specifies the duration of the cleaning
cycle when a head cleaning cartridge is inserted into the tape drive.
The default is 5. The range is 1-65535.
ENVIRONMENT
The $TAPE environment variable specifies the tape device to use if the
-f <device_special_file> option is omitted.
EXIT STATUS
The dd2 utilities use the following exit status codes, and may also produce output to -stdout
on success:
0 Operation succeeded.
nonzero Operation failed.
A nonzero return value describes the error encountered error during processing (see “Exit
Status” on page 6-5).
EXAMPLE
Assume that you want to do the following:
• Turn on the DST_POST_ERR and the DST_SYNC_EW configuration options.
• Turn off the DST_EOR_LOAD, DST_PARK_ANY, and DST_CHECKSUM configuration
options.
• Change the Write Buffer Full and Read Buffer Empty ratios.