| 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 |
I have a customer situation where the expected performance
does not match reality, and they complain of only getting
1.1Mbytes/second for either decnet or cluster (disk to disk
copy) operations between two alpha AXP 3000-500
the SMC device below is an fddi//ethernet "fast" hub, but the
performance of interest is between the to alpha on the main fddi
ring. What the heck can we tune, if anything ?
Colin
|--------- 3 PCS
|
===== CISCI ==== CISCO =====
|| ||
|| FDDI ||
|| ||
=== AXP======AXP=========SMC______________________________ 8 ether
ports
| | |________ | | | | | | |
| | DEBNI| | | | | | |
| | 6420 6320+3100 | | | |
| | DEBNA| | | | |
|________|______________| 4 MAIN NETWORK SEGMENTS
PRIVATE ETHERNET 200 - 350 NODES EACH
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1318.1 | KONING::KONING | Paul Koning, B-16504 | Tue Apr 19 1994 12:44 | 8 | |
Is the data in fact going over the FDDI and ONLY over the FDDI? 1.1 MB sounds suspiciously like the Ethernet line rate; if you're path-splitting or using just Ethernet, that's the number to expect. Unplug the Ethernet and see if things change. Second, are there any errors being counted? paul | |||||
| 1318.2 | No errors.... | COMICS::WEBSTERC | Wed Apr 20 1994 06:29 | 5 | |
Thanks Paul, I'll ask the customer to try this.
Meanhile, what ballpark figure for throughput should I expect ?
Colin
| |||||
| 1318.3 | KONING::KONING | Paul Koning, B-16504 | Wed Apr 20 1994 14:44 | 6 | |
Alphas have demonstrated FDDI line rate transfer for some applications. Results will vary, but I would say that any reasonably straightforward data transfer application (file copy, cluster access, etc.) should be fixed if it doesn't get 50 Mb or so... paul | |||||