Originally posted by: SystemAdmin

Hi

I am in swoop. I am trying to send some database archive files to our DR site. We use ftp or scp to drop those files from the production box to the DR box. But the problem arises when we try to ship those files. The transfer is very erratic. Sometimes successful and sometime not, and my ftp or scp sessions stalls. The session will hang and no more file transfer happens. But many a time it succeds. Most of the time when I do a "mput *", first few files are transfered successfully and then afetr sometime it will hang.I checked with the network guys and they says everything is fine with network.

What may be the problem? How do I pin point the problem? what should be my approach?
Any kind of help or advice is very welcome.

with regards
Kuntal
#AIX-Forum

Originally posted by: SystemAdmin

Kuntal: some more details would be helpful in framing an answer. How big are the files you're trying to transfer? What speed is the NIC over which you're trying to do this? Is there any "weak link" or choke point in the network path?

As a start I'd suggest you check your settings to see if your NIC is actually running full duplex and at rated speed. Also check for collisions and/or packet errors. Try doing a traceroute to your DR box. Is the path reasonable and as expected?

HTH

Jim Lane
#AIX-Forum

Originally posted by: SystemAdmin

Hi
The files are around 150MB each and some 25 of them.I have done traceroute to the servers from the DR server and vice versa. It seems the output is somewhat normal. But I noticed something like this: when I fire a traceroute from the DR server to any of the two production server, sometimes the first hop shows the default gateway and takes two more hops( * * * ) to reach another gateway(fourth hop) and finally fifth hop is the production system. At other times it takes 4 hops instead of 5 and the default gateway is absent from the report. First two hops being (* * *). Is this a normal behaviour ?

The NICs are running at 1000 Mbps full duplex as expected.

Here is the traceroute output:(10.51.2.34 being the default gateway)

---

1. traceroute 10.51.0.62

trying to get source for 10.51.0.62
source should be 10.51.2.35
traceroute to 10.51.0.62 (10.51.0.62) from 10.51.2.35 (10.51.2.35), 30 hops max
outgoing MTU = 1500
1 10.51.2.34 (10.51.2.34) 1 ms 0 ms 0 ms
2 * * *
3 * * *
4 10.51.0.243 (10.51.0.243) 21 ms 21 ms 21 ms
5 10.51.0.62 (10.51.0.62) 20 ms 21 ms 20 ms

1. traceroute 10.51.0.62

trying to get source for 10.51.0.62
source should be 10.51.2.35
traceroute to 10.51.0.62 (10.51.0.62) from 10.51.2.35 (10.51.2.35), 30 hops max
outgoing MTU = 1500
1 * * *
2 * * *
3 10.51.0.243 (10.51.0.243) 21 ms 21 ms 22 ms
4 10.51.0.62 (10.51.0.62) 20 ms 20 ms 20 ms
With regards
Kuntal

#AIX-Forum