topic Re: copy scp very slow in Operating System - HP-UX

copy scp very slow

Diego Maciel Gomes — Mon, 16 Jun 2008 16:16:42 GMT

Hello

I´m with a problem when I start the copy of file by scp.
My scp login is OK, not slow, just copy.
I copy by my machibe, gigabit to hp-ux, slow
I copy hp-ux to hp-ux, slow.
I change the port of switch, therearen´t a problem with port or crc error...
its just happen with hp-ux...

anyone can help me?

Re: copy scp very slow

TwoProc — Mon, 16 Jun 2008 16:36:45 GMT

Make sure that your HP and the switch are both set the same - both should be at Full Duplex, or both at half. Don't set both to auto, or one to auto and the other at Full or half, etc. Set both ends of the connection between switch and server to the same, and don't use auto.

Re: copy scp very slow

Diego Maciel Gomes — Mon, 16 Jun 2008 16:44:10 GMT

Hey..

ty for the answer...

but.. when i do the copy using ftp its work a lot :)

just in scp...

Re: copy scp very slow

Fabien GUTIERREZ — Mon, 16 Jun 2008 16:53:55 GMT

clearly you problem comes from the network if you do not have any misconfiguration on you ports i suggest you have a look at your network admin that may have set priorities on protocols on the lan

Re: copy scp very slow

Steven Schweda — Mon, 16 Jun 2008 16:58:22 GMT

Define "slow".

Does a very small file take 30 seconds?

Does an SSH login work well? If not,
"ssh -v" may tell you something.

On the server, can you do a reverse name
look-up (address-to-name) of the client?
Slow/bad DNS can cause a delay when making a
connection.

Re: copy scp very slow

Kenan Erdey — Mon, 16 Jun 2008 17:04:56 GMT

Hi,

scp is slower than ftp. Becacuse it uses cpu for encryption, because ftp is file transfer protocol, and scp doesn't use network throughput well because of encrption. If scp is much slower than ftp perhaps you may try upgrading your ssh in hp-ux box.

Kenan.

Re: copy scp very slow

TwoProc — Mon, 16 Jun 2008 17:07:13 GMT

On the HPUX server, add the hostname of the other machine in the /etc/hosts file.
Do the same on the HPUX server.

If the file is small, it could be a reverse name lookup issue to get started.

So, just make sure the host name of each server is in each other servers' host file.

Re: copy scp very slow

Diego Maciel Gomes — Mon, 16 Jun 2008 17:48:53 GMT

ty for the answers..
slow is...
my machine in giba to hp-ux giga = 4 kb/s
hp-ux to hp-ux is 23 kb/s

my etc/hosts is OK

if i do the same copy.. using scp.. linux to linux, or hp-ux to linux, its go OK..

if i return, linux to hp-ux, is slow.

my login ssh is OK..

my resolv is OK...

im out of date in updates...

i will try any patche to resolvi this problem... maybe one simply patche save-me ..

Re: copy scp very slow

TwoProc — Mon, 16 Jun 2008 18:44:16 GMT

Maybe you've got a cat 5 cable trying to do duty as a cat 6? Possibly stretched over the ballast of a flourescent light???

Re: copy scp very slow

Steven Schweda — Mon, 16 Jun 2008 19:45:16 GMT

> [...] Possibly stretched over the ballast
> of a flourescent light???

Would that be whole wheat "flourescent", or
the ordinary kind?

And the noise would affect SSH and FTP
differently because...?

Re: copy scp very slow

Steven E. Protter — Mon, 16 Jun 2008 19:51:31 GMT

Shalom,

Good test is trying named connection versus direct to an IP address. If there is a radical difference, that points the finger at name resolution speed.

Another common issue is the lack of a resolution for the system itself in /etc/hosts. This seems to slow down everything on an HP-UX system, waiting for name resolution for itself from a DNS server, especially a windows one.

SEP

Re: copy scp very slow

Diego Maciel Gomes — Mon, 16 Jun 2008 20:30:52 GMT

Hey..

ty for all helps

I fix this problem aplying a update of ssl and ssh..

im with the last version, and its running OK

ty