Hello,
some days ago I asked two questions about the DAT drive HP C1533A:
1. DIP-switches on the device
2. density bytes in /sys/sundev/streg.h (SunOS 4.1.2)
Many thanks to:
D.Mitchell@dcs.shef.ac.uk
tom@sees.bangor.ac.uk
ted@ssl.Berkeley.EDU
layer@Franz.COM
The outcome was:
1. SW 1 on = Data Compression enabled
SW 2 on = Host Control of data compression enabled
SW 3 on = Media Recognition System disabled
SW 4-8: Select SCSI profile
A best fit of the conflicting advises for switch settings for SUN is:
SW 1 = on
SW 2 = off (Sun cannot control data compression, see 2.)
SW 3 = off (Media Recognition enabled)
SW 4,5 = on
SW 6,7,8 = off
(SW 8 is disputed)
2. SUN cannot control compression when writing tapes, since the drive
does not understand the density bytes in the kernel configuration
file (set all four to zero).
Compression mode can be controlled with the SCSI compression mode page
which is however unsupported by SunOS (Solaris?).
So the advice was to disable host control of data compression (SW 2 off)
and leave compression enabled (SW 1 on)
Gerhard Hertlein
Philips Kommunikations Industrie AG
Dept. LN
D-90327 Nuremberg
Fed.Rep of Germany
Email: ln_ghe@pki-nbg.philips.de
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