Asri-unix.1194
net.works
utzoo!decvax!cca!sri-unix!mike@BRL
Fri Apr 9 00:51:26 1982
UNIX & Remote disks
From: Michael Muuss <MIKE@BRL>
We have a home-grown UNIX-UNIX network with virtual disk access
across the network, and local -vs- remote disk access is
indistinguishable. Important details:
1) We use DEC PCL-11s (16Mbaud network hardware)
2) Home-grown, low overhead protocols ("BRLNET").
Testing indicates that we can bring 100 blocks/sec across the
network with only about a 5% "network overhead" expense
on the server end. (Both ends PDP-11/70 with MOS memory).
When we generalize BRLNET to run under InterNet IP, we expect the
cost to go up, but it shouldn't be terrible.
3) Special "High-Performance" BRL/JHU UNIX Kernel (although the effects
of this on the measurement cited above is small. Regular UNIX's
may have perhaps twice the overhead).
More on all this if there is interest.
-Mike
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