| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
This note has also been posted in the CLUSTER conference.
We are assisting a customer to finalize a configuration to upgrade their
existing cluster. The proposed configuration is as follows:
|---12 disks--|
| |
|---sys disk--|
| |
\____ _____/
SC
____ _____
/ | \
/ | \
6510 6510 8530..
|| || :
------------------- connected to Ethernet segment
| DEConcentrator |
| 500 |
-------------------
|| ||
DECbridge DECbridge
610 610
: : : : : :
6 Ethernet segments with 24 VAXstation 3100 and 24 VAXstation 2000
plus host based X-windows terminals, PCs.
All VAXs & VAXstations boot from the the same system disk. The VAXstations
have local page and swap disks. The VAXstations are running Interleaf (11
concurrent), software development (LSE, ADA, PASCAL).
Problem:
They are currently running a single Ethenet segment and it is busy (40-50%
average). 80% of the traffic is LAVC. The reasoning behind the the FDDI
equipment is to increase the bandwidth available to access the main cluster.
Questions:
(1) Our concern is the DECbridge 610 - will it be a bottleneck ?
(2) Does anyone have a similar environment?
(3) What has been the experience with this configuration with respect to
performance?
Any other ideas would be welcome.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 546.1 | Shouldn't be a problem | JUMP4::JOY | Happy at last | Mon May 04 1992 12:53 | 14 |
Leslie,
If I understand you correctly, you are taking a single Ethernet
segment and splitting it into 6 segments which you will then connect
thru the 610s onto the FDDI ring. Your single Ethernet today is running
around 40% utilization. Since each port on the DB610s can handle ~7Mbps
and each of the 3 ports is bridged from the others and the FDDI side, I
can't imagine how the DB610s could cause a bottleneck. The thruput of
the bridges are around 122Mbps total, so I don't think you have
anything to worry about insofar as the bridges being bottlenecks.
Can't help with your other questions though.
Debbie
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