Mailing List Archive: OpenSSH: Dev

scp should not report 100% until the last byte is transferred

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toralf.foerster at gmx

Jan 12, 2012, 12:46 AM

Post #1 of 3 (392 views)
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scp should not report 100% until the last byte is transferred

Hello,

just my opinion, but yesterday I run into a case, where after 7 hours of
transferring a file (a little bit greater than 1 GB) the scp reported 100% and
after that exited with an error (AIX 7.1):

$ tsocks scp foo user [at] hos:/tmp
...
100% 1101MB 44.2KB/s 448.0KB/s 7:05:38
scp: /tmp/foo: File too large

Probably it should not be rounded up to 100% ?

--
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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peter at stuge

Jan 12, 2012, 2:17 AM

Post #2 of 3 (388 views)
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Re: scp should not report 100% until the last byte is transferred [In reply to]

Toralf Förster wrote:
> just my opinion, but yesterday I run into a case, where after 7 hours of
> transferring a file (a little bit greater than 1 GB) the scp reported 100% and
> after that exited with an error (AIX 7.1):
>
> $ tsocks scp foo user [at] hos:/tmp
> ...
> 100% 1101MB 44.2KB/s 448.0KB/s 7:05:38
> scp: /tmp/foo: File too large
>
> Probably it should not be rounded up to 100% ?

The scp protocol is very primitive, and I'm not sure that an error
can be detected at all until after 100% has been sent.

Recommend use SFTP.

//Peter
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philipp.marek at linbit

Jan 12, 2012, 2:40 AM

Post #3 of 3 (384 views)
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Re: scp should not report 100% until the last byte is transferred [In reply to]

On Thursday, 12. Jan 2012, Toralf Förster wrote:
> just my opinion, but yesterday I run into a case, where after 7 hours of
> transferring a file (a little bit greater than 1 GB) the scp reported
> 100% and after that exited with an error (AIX 7.1):
>
> $ tsocks scp foo user [at] hos:/tmp
> ...
> 100% 1101MB 44.2KB/s 448.0KB/s 7:05:38
> scp: /tmp/foo: File too large
>
> Probably it should not be rounded up to 100% ?
Perhaps another part of the problem is that it doesn't wait for byte
position acknowledgments from the remote side ...

I've seen it fill up the TCP buffers, and then stay at 100% for ~30 seconds
until the buffers were drained over the slow connection.

Regards,

Phil
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