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- .\" @(#)5.t 6.3 (Berkeley) 4/17/91
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- .\".ds RH "Sample Configuration Files
- .ne 2i
- .NH
- SAMPLE CONFIGURATION FILES
- .PP
- In this section we will consider how to configure a
- sample VAX-11/780 system on which the hardware can be
- reconfigured to guard against various hardware mishaps.
- We then study the rules needed to configure a VAX-11/750
- to run in a networking environment.
- .NH 2
- VAX-11/780 System
- .PP
- Our VAX-11/780 is configured with hardware
- recommended in the document ``Hints on Configuring a VAX for 4.2BSD''
- (this is one of the high-end configurations).
- Table 1 lists the pertinent hardware to be configured.
- .DS B
- .TS
- box;
- l | l | l | l | l
- l | l | l | l | l.
- Item Vendor Connection Name Reference
- _
- cpu DEC VAX780
- MASSBUS controller Emulex nexus ? mba0 hp(4)
- disk Fujitsu mba0 hp0
- disk Fujitsu mba0 hp1
- MASSBUS controller Emulex nexus ? mba1
- disk Fujitsu mba1 hp2
- disk Fujitsu mba1 hp3
- UNIBUS adapter DEC nexus ?
- tape controller Emulex uba0 tm0 tm(4)
- tape drive Kennedy tm0 te0
- tape drive Kennedy tm0 te1
- terminal multiplexor Emulex uba0 dh0 dh(4)
- terminal multiplexor Emulex uba0 dh1
- terminal multiplexor Emulex uba0 dh2
- .TE
- .DE
- .ce
- Table 1. VAX-11/780 Hardware support.
- .LP
- We will call this machine ANSEL and construct a configuration
- file one step at a time.
- .PP
- The first step is to fill in the global configuration parameters.
- The machine is a VAX, so the
- .I "machine type"
- is ``vax''. We will assume this system will
- run only on this one processor, so the
- .I "cpu type"
- is ``VAX780''. The options are empty since this is going to
- be a ``vanilla'' VAX. The system identifier, as mentioned before,
- is ``ANSEL,'' and the maximum number of users we plan to support is
- about 40. Thus the beginning of the configuration file looks like
- this:
- .DS
- .ta 1.5i 2.5i 4.0i
- #
- # ANSEL VAX (a picture perfect machine)
- #
- machine vax
- cpu VAX780
- timezone 8 dst
- ident ANSEL
- maxusers 40
- .DE
- .PP
- To this we must then add the specifications for three
- system images. The first will be our standard system with the
- root on ``hp0'' and swapping on the same drive as the root.
- The second will have the root file system in the same location,
- but swap space interleaved among drives on each controller.
- Finally, the third will be a generic system,
- to allow us to boot off any of the four disk drives.
- .DS
- .ta 1.5i 2.5i
- config vmunix root on hp0
- config hpvmunix root on hp0 swap on hp0 and hp2
- config genvmunix swap generic
- .DE
- .PP
- Finally, the hardware must be specified. Let us first just try
- transcribing the information from Table 1.
- .DS
- .ta 1.5i 2.5i 4.0i
- controller mba0 at nexus ?
- disk hp0 at mba0 disk 0
- disk hp1 at mba0 disk 1
- controller mba1 at nexus ?
- disk hp2 at mba1 disk 2
- disk hp3 at mba1 disk 3
- controller uba0 at nexus ?
- controller tm0 at uba0 csr 0172520 vector tmintr
- tape te0 at tm0 drive 0
- tape te1 at tm0 drive 1
- device dh0 at uba0 csr 0160020 vector dhrint dhxint
- device dm0 at uba0 csr 0170500 vector dmintr
- device dh1 at uba0 csr 0160040 vector dhrint dhxint
- device dh2 at uba0 csr 0160060 vector dhrint dhxint
- .DE
- .LP
- (Oh, I forgot to mention one panel of the terminal multiplexor
- has modem control, thus the ``dm0'' device.)
- .PP
- This will suffice, but leaves us with little flexibility. Suppose
- our first disk controller were to break. We would like to recable the
- drives normally on the second controller so that all our disks could
- still be used without reconfiguring the system. To do this we wildcard
- the MASSBUS adapter connections and also the slave numbers. Further,
- we wildcard the UNIBUS adapter connections in case we decide some time
- in the future to purchase another adapter to offload the single UNIBUS
- we currently have. The revised device specifications would then be:
- .DS
- .ta 1.5i 2.5i 4.0i
- controller mba0 at nexus ?
- disk hp0 at mba? disk ?
- disk hp1 at mba? disk ?
- controller mba1 at nexus ?
- disk hp2 at mba? disk ?
- disk hp3 at mba? disk ?
- controller uba0 at nexus ?
- controller tm0 at uba? csr 0172520 vector tmintr
- tape te0 at tm0 drive 0
- tape te1 at tm0 drive 1
- device dh0 at uba? csr 0160020 vector dhrint dhxint
- device dm0 at uba? csr 0170500 vector dmintr
- device dh1 at uba? csr 0160040 vector dhrint dhxint
- device dh2 at uba? csr 0160060 vector dhrint dhxint
- .DE
- .LP
- The completed configuration file for ANSEL is shown in Appendix C.
- .NH 2
- VAX-11/750 with network support
- .PP
- Our VAX-11/750 system will be located on two 10Mb/s Ethernet
- local area networks and also the DARPA Internet. The system
- will have a MASSBUS drive for the root file system and two
- UNIBUS drives. Paging is interleaved among all three drives.
- We have sold our standard DEC terminal multiplexors since this
- machine will be accessed solely through the network. This
- machine is not intended to have a large user community, it
- does not have a great deal of memory. First the global parameters:
- .DS
- .ta 1.5i 2.5i 4.0i
- #
- # UCBVAX (Gateway to the world)
- #
- machine vax
- cpu "VAX780"
- cpu "VAX750"
- ident UCBVAX
- timezone 8 dst
- maxusers 32
- options INET
- options NS
- .DE
- .PP
- The multiple cpu types allow us to replace UCBVAX with a
- more powerful cpu without reconfiguring the system. The
- value of 32 given for the maximum number of users is done to
- force the system data structures to be over-allocated. That
- is desirable on this machine because, while it is not expected
- to support many users, it is expected to perform a great deal
- of work.
- The ``INET'' indicates that we plan to use the
- DARPA standard Internet protocols on this machine,
- and ``NS'' also includes support for Xerox NS protocols.
- Note that unlike 4.2BSD configuration files,
- the network protocol options do not require corresponding pseudo devices.
- .PP
- The system images and disks are configured next.
- .DS
- .ta 1.5i 2.5i 4.0i
- config vmunix root on hp swap on hp and rk0 and rk1
- config upvmunix root on up
- config hkvmunix root on hk swap on rk0 and rk1
-
- controller mba0 at nexus ?
- controller uba0 at nexus ?
- disk hp0 at mba? drive 0
- disk hp1 at mba? drive 1
- controller sc0 at uba? csr 0176700 vector upintr
- disk up0 at sc0 drive 0
- disk up1 at sc0 drive 1
- controller hk0 at uba? csr 0177440 vector rkintr
- disk rk0 at hk0 drive 0
- disk rk1 at hk0 drive 1
- .DE
- .PP
- UCBVAX requires heavy interleaving of its paging area to keep up
- with all the mail traffic it handles. The limiting factor on this
- system's performance is usually the number of disk arms, as opposed
- to memory or cpu cycles. The extra UNIBUS controller, ``sc0'',
- is in case the MASSBUS controller breaks and a spare controller
- must be installed (most of our old UNIBUS controllers have been
- replaced with the newer MASSBUS controllers, so we have a number
- of these around as spares).
- .PP
- Finally, we add in the network devices.
- Pseudo terminals are needed to allow users to
- log in across the network (remember the only hardwired terminal
- is the console).
- The software loopback device is used for on-machine communications.
- The connection to the Internet is through
- an IMP, this requires yet another
- .I pseudo-device
- (in addition to the actual hardware device used by the
- IMP software). And, finally, there are the two Ethernet devices.
- These use a special protocol, the Address Resolution Protocol (ARP),
- to map between Internet and Ethernet addresses. Thus, yet another
- .I pseudo-device
- is needed. The additional device specifications are show below.
- .DS
- .ta 1.5i 2.5i 4.0i
- pseudo-device pty
- pseudo-device loop
- pseudo-device imp
- device acc0 at uba? csr 0167600 vector accrint accxint
- pseudo-device ether
- device ec0 at uba? csr 0164330 vector ecrint eccollide ecxint
- device il0 at uba? csr 0164000 vector ilrint ilcint
- .DE
- .LP
- The completed configuration file for UCBVAX is shown in Appendix C.
- .NH 2
- Miscellaneous comments
- .PP
- It should be noted in these examples that neither system was
- configured to use disk quotas or the 4.1BSD compatibility mode.
- To use these optional facilities, and others, we would probably
- clean out our current configuration, reconfigure the system, then
- recompile and relink the system image(s). This could, of course,
- be avoided by figuring out which relocatable object files are
- affected by the reconfiguration, then reconfiguring and recompiling
- only those files affected by the configuration change. This technique
- should be used carefully.
-