HP Ultrium Configuration Manual page 30

Parameter
<options>
<no. of
densities>
<density n>
<density 3> 0x40
<default
density>
<X timeout>
Values for the parameters for
target
lun
30 Sun Systems, Solaris 8, 9, 10
Value Meaning
or This value is derived from constants provided in
0xd639
0x18659 /usr/include/sys/scsi/targets/stdef.h
which operations the driver can perform with the attached device by
using a unique value for each feature and then adding them together
to form the options value. Supported features will vary with OS
revision, and may include the following:
0x001
0x008
0x010
0x020
0x040
0x0200
0x0400
0x1000
0x4000
0x8000
0x10000
So
0xd639
long timeouts for erase, EOD recognition, unloadable device driver, 5
x longer timeouts, buffer writes and pre-acknowledge success,
variable records not limited to 64 KB, auto-density over-ride and
MODE SELECT
Similarly,
enabled, automatic density determination, EOD recognition,
unloadable device driver, variable records not limited to 64 KB, and
device selection of mode pages for controlling compression.
There are four densities following in the parameter list.
4
Creates a device file with compression disabled.
0x00
(Gen 1) The density code for data compression enabled by default.
(Gen 2)
0x42
Density 3 is the default (
3
Generation 2 drives)
All timeouts are in seconds
are as follows:
name
X specifies the SCSI ID (target) of the device.
X
Specifies the LUN for the device.
0
Device supports variable length records.
Device can backspace over files (as in the 'mt bsf' option).
Device supports backspace record (as in 'mt bsr').
Device requires a long time-out period for erase functions.
Device will automatically determine the tape density.
Device knows when end of data has been reached.
Device driver is unloadable.
Time-outs five times longer than normal.
Driver buffers write requests and pre-acknowledges success
to application.
Variable record size not limited to 64 KB.
Device determines which of the two mode pages the device
supports for selecting or deselecting compression.
indicates variable record length, bsf and bsr enabled,
compression.
indicates variable record length, bsf and bsr
0x018659
for Generation 1 drives,
0x40
. The value determines
for
0x42