SUNDSTRO@FINABO.BITNET (01/16/87)
We have one uVax II and are planing to buy another one. We are using
the uVax for gathering data from our pilotplants for process
calculations and returning setpoints to controllers (we are using a
asynchronous line). We are making process simulations at the same time
we are using the pilotplant. We are also developing processmodels for
the pilotplants.
I recently heard from Digital that it is possible to make a cluster of 2
uVax'es. It sound's good.
I have still a couple of things I would like to know more about.
1. Is it possible in a cluster to dedicate one processor for "on-line"
process calculations, while the other one is for program development.
2. What is the minimum disk space requirement for the system-disk.
Thanks in advance,
Hans Sundstroem
E-mail Sundstro@Finabo.Bitnet
Abo Akademi
Department of Chemical Engineering
Heat Engineering Laboratory
FinlandLEICHTER-JERRY@YALE.ARPA (01/20/87)
We have one uVax II and are planing to buy another one.... I recently
heard from Digital that it is possible to make a cluster of 2 uVax'es. It
sound's good.
I have still a couple of things I would like to know more about.
1. Is it possible in a cluster to dedicate one processor for "on-line"
process calculations, while the other one is for program development.
The environment you describe [omitted above - process control stuff] seems to
be a pretty tightly controlled one. VMS in general won't splatter processes
around from system to system; the only automatic cross-system allocation of
processes is by the batch system, IF you create a batch queue that feeds
executor queues on both systems; by DECnet, IF you set up and use a cluster
node name; and by LAT, IF you set up the same service on both machines. You
don't HAVE to do any of these things, in which case processes will go only go
on the system you decide to put them on.
2. What is the minimum disk space requirement for the system-disk.
Tough question to answer. I have a very fully configured VAXStation - a LOT
of compilers, etc. - and have about 47,000 blocks worth of system files,
plus another 40,000 for paging/swapping space (I have my system configured
for large jobs). You can probably get by with a third that, if you squeeze.
An RD52 is probably just large enough for your system disk, but I'd really
recommend an RD53. (Actually, I'm not even sure an RD52 is supported as the
system disk on LAV boot node.)
-- Jerry
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