tcpip copying are slow

[Alf_3]

There are OpenVMS 7.3-1 and Advanced Server 7.3 . Tcpip(5.3) file copying from VMS (Advanced server)to any microsoft windows and from any microsoft windows to VMS(Advanced server) both too slowly (about 100kbyte/sec). The net is 100Mb/s. Ftp copying from VMS to windows is ok (9Mbyte/sec). Ftp copying from windows to VMS slowly again. Ftp copying between VMS and Unix is ok. Any decnet copying is ok too. What's it? Can I do anything ?

[Willem Grooters]

Alf,
It can have a number of causes, though not always obvious.
1. Don't use "auto-negotiate" on your VMS-machine's NIC, this is know to cause problems. Set it fixed to FASTFD.
2. Multiple paths between VMS and Windows? Check route on boths sides (TCPIP SHO ROUTE)
3. Could be a DNS problem:
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=469647
4. Someone in this forum found a load-balancing issue causing performance prblems but I cannot locate the source...

HTH

Willem

[labadie_1]

ucx sh proto tcp/paramshows delay ack or nodelay ack.You can try nodelay ack, which usually gives better performances.And tune the caches of the advanced server.Anyway, FTP will behave faster than Advanced Server.

[Martin P.J. Zinser]

Hello Alf,

have a look at

http://h71000.www7.hp.com/doc/732final/6526/6526pro_037.html#trouble_ftp_perform_sec

The window size of 4096 might be too small. E.g. HGFTP uses 17520 as the default.

Greetings, Martin