topic Re: SFTP Stalled then resumes in Operating System - HP-UX

SFTP Stalled then resumes

Darren Etheridge_2 — Tue, 11 May 2010 17:09:22 GMT

When doing a SFTP and the status says "STALLED" then resumes, does this cause any data integrity problems on the destination?

Re: SFTP Stalled then resumes

Steven E. Protter — Tue, 11 May 2010 17:17:02 GMT

Shalom Darren,

No stalled does not cause data integrity issues. If such an issue arises, the sftp will terminate with a non-zero error code.

SEP

Re: SFTP Stalled then resumes

Darren Etheridge_2 — Tue, 11 May 2010 17:30:17 GMT

I am though getting some sftp puts that are not reaching 100%, is there a parameter or way to resend the file or change the timeout?

Re: SFTP Stalled then resumes

Steven E. Protter — Tue, 11 May 2010 17:45:24 GMT

Shalom,

ssh_config and sshd_config contain good self documentation that will let you alter parameters such as timeout and other characteristics.

However, this behavior should not be happening with such a robust protocol.

So I have some questions.

lanadmin -x lan0
# change lan0 to the actual active lan, see netstat -in for that.

Looking for a duplex other than full.

dmesg
# check for network errors.

Are you going through a firewall or VPN?

Please post answers.

If the sftp transfer does not reach 100% it is useless and must be started over.

SEP

Re: SFTP Stalled then resumes

Darren Etheridge_2 — Tue, 11 May 2010 17:53:56 GMT

Attached is the lanadmin info for our lan cards. We are using a firewall.

PPA Number = 900
Description = lan900 Hewlett-Packard LinkAggregate Interface
Type (value) = ethernet-csmacd(6)
MTU Size = 1500
Speed = 2000000000
Station Address = 0x0017084c085f
Administration Status (value) = up(1)
Operation Status (value) = up(1)
Last Change = 434
Inbound Octets = 1992247307
Inbound Unicast Packets = 1987266884
Inbound Non-Unicast Packets = 1697991
Inbound Discards = 0
Inbound Errors = 0
Inbound Unknown Protocols = 233
Outbound Octets = 3187878956
Outbound Unicast Packets = 1069539980
Outbound Non-Unicast Packets = 24247
Outbound Discards = 158
Outbound Errors = 0
Outbound Queue Length = 0
Specific = 0

Re: SFTP Stalled then resumes

Darren Etheridge_2 — Tue, 11 May 2010 18:19:10 GMT

and the thruput is only 60/kbs average!

Re: SFTP Stalled then resumes

nightwich — Thu, 13 May 2010 13:52:18 GMT

Hi Darren

Why are you usinf sftp.

Why not scp ?

Are you using a program like winscp ? or just are you dping a sftp to a server.

Please give more detail. I do not see any network problem.

Regards.

Re: SFTP Stalled then resumes

Steven E. Protter — Thu, 13 May 2010 14:48:55 GMT

Shalom,

Please post:

lanadmin -x 900

I'm not sure what lanadmin will give you on an APA nic.

If its not helpful:

lanscan

Then landamin -x 0
0 for lan0 use only the number, do this for each lan.

What we're looking for is duplex and speed information.

Its quite common to sometimes have issues here and they can be fixed with some additional configuration.

Note also that you will never in any environment get the theoretical maximum speed on a network connection. The stalling we can fix, maximum theoretical speed on practice won't happen. Getting good speed, in the 10-20 Mb/s range on a GB connection with good switches is quite possible.

SEP

Re: SFTP Stalled then resumes

Darren Etheridge_2 — Thu, 13 May 2010 14:50:35 GMT

I think I found out our problem, our ISP piple was only 3MB.... We changed it to 10MB yesterday and now the problems seemed to be gone. But thank you for all of your help!

Re: SFTP Stalled then resumes

Darren Etheridge_2 — Thu, 13 May 2010 14:52:42 GMT

We were maxed out on our ISP pipe of 3MB so our uploads to another site (FL to PA) were timing out. We upgraded our ISP speed to 10MB and that solved the timeouts & stalls :)

Our vendor requires SFTP and not SCP

Thank you all for your help!