B
Enabling/Disabling Data Compression
Under OSF and OpenVMS
B.1 OSF TLZ07 Compression and Noncompression Modes
The default mode for the TLZ07 tape drive is noncompression mode. To use
the TLZ07 tape drive in compression mode, specify the device as:
/dev/rmt?h or
/dev/rmt?m
To use the TLZ07 tape drive in noncompression mode, specify the device as:
/dev/rmt?1 or /dev/rmt?a
B.2 OSF DUMP Utility
The parameters that should be used when running the DUMP utility on a
TLZ07 tape drive in compressed and noncompressed mode are as follows:
Noncompressed Mode:
density = 61000 effective tape length (with 120 meter tape)
size = 76586 (with 120 meter tape)
Example: dump 0dsf 61000 76586 /dev/rmt?1/dev/rrz0g
Compressed Mode:
density = 61000 effective tape length (with 120 meter tape)
size = 76586 (with 120 meter tape)
2
compression (which, for most cases is
2)
Example: dump 0dsf 61000 153172 /dev/rmt?h/dev/rrz0g
NOTE
You must type OSF commands using lowercase characters.
Enabling/Disabling Data Compression Under OSF and OpenVMS B–1
