hans@log-hb.UUCP (Hans Albertsson) (09/22/84)
[]
I'm trying to convince management here to let me put my
VAXen on ethernet. There's one fixed VMS, one fixed 4.2, and
one running either depending on our momentary needs.
I have some misgivings, namely:
They're all 750-s w RA81/RA60 on UDA50, but with a single UNIBUS
adapter. When I add DEUNAs, will they overload? How nessecary will
it be to get the second unibus option installed?
Can TCP/IP coexist with DECNET, on a single DEUNA, or do I have to
put two DEUNAs on the VMS machine that is to be the gateway?
I expect to use the network mainly for automated work, such as
software updating, and disk space redistribution. The amount of
remote logins will stay low, since there will be a terminal switch
as well.
Comments, anyone?
P.S. I recently saw a note on the QZ/COM ( which has ARPANET connections )
from Joe Sventek at LBL, and Joe said something about some software by
Lou Salkind at NYU. If one of those two would care to publicise some
coments on this, I'm sure we'd all listen carefully.
--
{decvax,philabs}!mcvax!enea!log-hb!hans
Hans Albertsson,
TeleLOGIC AB
Box 1001,
S-14901 Nynashamn,
SWEDENlee@rochester.UUCP (Lee Moore) (09/22/84)
> They're all 750-s w RA81/RA60 on UDA50, but with a single UNIBUS > adapter. When I add DEUNAs, will they overload? How nessecary will > it be to get the second unibus option installed? Both the UDA50 and the Deuna boards are big pigs for amps on your Unibus. A typical /750 has about 25 amps of +5 power to offer. Just the Denua and the UDA50 will exceed this. This doesn't mean that you have to buy a second UBA. You can buy an expansion cabinet with an extra power supply for another 25 amps (at least). > Can TCP/IP coexist with DECNET, on a single DEUNA, or do I have to > put two DEUNAs on the VMS machine that is to be the gateway? The TWG TCP/IP has an optional module that allows DECNET and TCP/IP to share the same DEUNA. > P.S. I recently saw a note on the QZ/COM ( which has ARPANET connections ) > from Joe Sventek at LBL, and Joe said something about some software by > Lou Salkind at NYU. If one of those two would care to publicise some > coments on this, I'm sure we'd all listen carefully. Lou Salkind at NYU did a Deuna driver for 4.2BSD. -- = lee@rochester rochester!lee =
lee@rochester.UUCP (Lee Moore) (09/26/84)
Opps, I just saw in ra.info-vax that Lou Salkind at NYU also did something called Elink which allows one to run both TCP/IP and Decnet on the same Deuna board. This is probably closer to the questioners desires. -- = lee@rochester rochester!lee =
mogul@CSL-Vax.ARPA (Jeff Mogul) (09/26/84)
We have a number of VAX-11/750s with one Unibus (UBI), one UDA50, and one DEUNA, plus 3 other Unibus interfaces (RL02, DZ11, and a 3Mbit Xerox experimental ethernet). We have not seen any problems that could be attributed to lack of +5 volt power (although getting boards in and out of the backplane is a real pain.) We also don't see any signs of the Unibus being overwhelmed by the combined transfer rates; the CPU runs out first. Of course, we run Unix, and that might draw less power than VMS. :-) -Jeff
mann@CSL-Vax.ARPA (Tim Mann) (09/26/84)
Although I can't name any problems we've had that are known to be caused by a lack of 5V power, the 750s Jeff mentions are definitely exceeding the ratings on their 5V power supplies, and we have the second Unibus on order for at least 2 or 3 of them. (We could probably get by with just the expansion power supply, but that takes up another cabinet anyway, and we may be hanging more things on the Unibus in the future.) --Tim