42 Introduction to Configuration Switches
Data Compression—Switches 1 and 2
Switches 1 and 2 are used to configure the way in which data compression is
set for the drive. The following table shows the available options; whether
data compression is enabled or disabled at power-on, and whether the host
can subsequently control compression:
Switch 1 controls the default state of the drive at power-on:
n
If it is ON, the default is compression enabled, which means that data will
be compressed without the knowledge of the host.
n
If it is OFF, the default is compression disabled.
Switch 2 controls whether or not the host can change the drive’s data
compression status:
n
If it is ON, data compression can be set on or off using appropriate SCSI
commands sent from the SCSI tape driver or your backup software.
n
If it is OFF, the host cannot change the default compression setting.
Note By default, the drives and autoloaders will decompress data
when reading a compressed tape, regardless of the settings of
switches 1 and 2. Decompression can be turned off through the
DC Characteristics Page of the SCSI
MODE SELECT
command.
Media Recognition System (MRS)—Switch 3 or 8
Note The Media Recognition System is described in the Hardware
Intergration Guide, Volume 1 of the HP DDS Technical Manual
(see the Introduction).
Silicon Graphics SGI
On On Off On On Off Off On
Sun Solaris
On On Off Off On On Off Off
1 2 3 4 5 6 7 8
Switch 1 Switch 2 Data Compression at Power-On Control of Compression
On On Enabled Host control
On Off Enabled No host control
Off
On Disabled Host control
Off Off Disabled No host control
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