Installation guide

file and the DIGITAL UNIX tar command reporting a checksum error. To
read an ULTRIX tar archive spanning multiple tapes using the DIGITAL
UNIX tar command, use the −U option on the DIGITAL UNIX system.
This option allows the DIGITAL UNIX tar command to read tapes and to
ignore the header information specific to ULTRIX.
5.4 Configuring Small Computer System Interconnect
Devices
During the doconfig portion of the installation, the sizer program
determines what hardware (such as disks and tapes) is attached to your
system and reports its findings in the system configuration file.
On ULTRIX systems, sizer automatically places 16 Small Computer
System Interface (SCSI) device entries (rz0-rz7 for disks and tz0-tz7 for
tapes) in the system configuration file. This behavior enables you to attach
additional SCSI devices at any time without having to rebuild your kernel.
On DIGITAL UNIX systems, sizer finds only the SCSI devices physically
attached to your system at the time of installation and specifies those
devices in the system configuration file. For example, if you have an RZ56
as unit 0, a TLZ04 as unit 1, and an RZ24 as unit 2 on your system, sizer
places only these three devices in your configuration file, as rz0, tz1, and
rz2, respectively. If you later add new devices to your system, you must
edit the configuration file to include the new devices and rebuild the kernel.
You can save yourself the need to repeat this process by using the
/sys/conf/GENERIC file as a guide to edit the configuration file to add all
possible rz
n and tz n devices the first time you rebuild the kernel. If you
are performing an advanced installation, you can edit the configuration file
before the first kernel is built. For information about editing the DIGITAL
UNIX configuration file and rebuilding the kernel, see the System
Administration manual.
The RZ57 SCSI disk and TZK10 SCSI tape units are not supported on a
DIGITAL UNIX system.
5.5 Configuring DIGITAL UNIX Shared Memory
Some applications can require you to configure shared memory. Configuring
shared memory on a DIGITAL UNIX system is done in the same way as on
an ULTRIX system, by editing the configuration file and rebuilding the
kernel. However, the configuration parameters are slightly different, as
shown in the following table:
5–8 Migrating Your ULTRIX System and Network Environment