HP Ultrium Drive, Техническое справочное руководство

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Sun Systems, Solaris 8, 9, 10 30
Values for the parameters for
name
are as follows:
<bsize> 0
Indicates variable block size.
<options> 0xd639
or
0x18659
This value is derived from constants provided in
/usr/include/sys/
scsi/targets/stdef.h
. The value determines 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
Device supports variable length records.
0x008
Device can backspace over files (as in the ‘
mt bsf
’ option).
0x010
Device supports backspace record (as in ‘
mt bsr
’).
0x020
Device requires a long time-out period for erase functions.
0x040
Device will automatically determine the tape density.
0x0200
Device knows when end of data has been reached.
0x0400
Device driver is unloadable.
0x1000
Time-outs five times longer than normal.
0x4000
Driver buffers write requests and pre-acknowledges success
to application.
0x8000
Variable record size not limited to 64 KB.
0x10000
Device determines which of the two mode pages the device
supports for selecting or deselecting compression.
So
0xd639
indicates variable record length,
bsf
and
bsr
enabled, long
timeouts for erase, EOD recognition, Unloadable device driver, 5 x
longer timeouts, buffer writes and pre-acknowledge sucess, variable
records not limited to 64 KB, auto-density over-ride and
MODE SELECT
compression.
<no. of
densities>
4
There are four densities following in the parameter list.
<density n> 0x00
Creates a device file with compression disabled.
<density 3> 0x40,
0x42
or
0x44
The density code for data compression enabled by default.
<default
density>
3
Density 3 (
0x44
) is the default for Generation 3 drives.
<X timeout>
All timeouts are in seconds
Parameter Value Meaning
target X
X
specifies the SCSI ID (target) of the device.
lun 0
Specifies the LUN for the device.
Parameter Value Meaning