[OT] Re: rsync + ssh fail on raid; okay on 2.2.x

[OT] Re: rsync + ssh fail on raid; okay on 2.2.x

[Tobias Ringstrom]

On Thu, 18 Jan 2001, Nick Urbanik wrote:

> Dear folks,
>
> I use rsync to transfer my mail (including this list) from work to home
> over ppp ussing OpenSSH 2.3.0.  I have no problem transfering  hundreds
> of megabytes of my babies' photos from a non-raid partition (going to
> work), but I get:
>
> nsmail/Inbox
> Write failed: Cannot allocate memory
> unexpected EOF in read_timeout

This is not the right place to ask (or answer), but anyway:

Make sure you do not use protocol version 2 with openssh 2.3.0, since it
is ***very*** broken, and more often than not fails to receive (and
transmit?) all data.

Try
	dd if=/dev/zero bs=1k count=100 | wc
and
	ssh machine dd if=/dev/zero bs=1k count=100 | wc

They should give you the same result.  If not, you have the broken ssh.

/Tobias

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rsync + ssh fail on raid; okay on 2.2.x

[Nick Urbanik]

Dear folks,

I use rsync to transfer my mail (including this list) from work to home
over ppp ussing OpenSSH 2.3.0.  I have no problem transfering  hundreds
of megabytes of my babies' photos from a non-raid partition (going to
work), but I get:

nsmail/Inbox
Write failed: Cannot allocate memory
unexpected EOF in read_timeout

about 19 times out of 20 (1 success so far)
Kernel: 2.4.0, no patches
PIII 450MHz, 256MB RAM, Acus P3B-F motherboard (Intel 440BX)
Mail going to Raid 1 device
The file Inbox is only 2.9MB
OS = Red Hat 7 with all updates, both home and work.
Same with ppp 2.3.x and ppp 2.4.0
Same whether work machine runs 2.2.16 or 2.4.0 kernel.

Any suggestions on where to begin to look for the problem?  I really
need my email.

--
Nick Urbanik, Dept. of Computing and Mathematics
Hong Kong Institute of Vocational Education (Tsing Yi)
email: nicku@vtc.edu.hk
Tel:   (852) 2436 8576, (852) 2436 8579   Fax: (852) 2435 1406
pgp ID: 7529555D fingerprint: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B



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Re: rsync + ssh fail on raid; okay on 2.2.x

[Nick Urbanik]

Nick Urbanik wrote:

> Mark Hahn wrote:
>
> > > Kernel: 2.4.0, no patches
> >
> > use 2.4.1-pre8.  much better VM tuning.
>
> Thank you Mark, I will try that.

Yes, 2.4.1-pre8 fixes this, apparently completely.  Something was severely broken
in 2.4.0 memory management.

> > > PIII 450MHz, 256MB RAM, Acus P3B-F motherboard (Intel 440BX)
> > > Mail going to Raid 1 device
> > > The file Inbox is only 2.9MB
> > > OS = Red Hat 7 with all updates, both home and work.
> > > Same with ppp 2.3.x and ppp 2.4.0
> > > Same whether work machine runs 2.2.16 or 2.4.0 kernel.
> >
> > any swap?
>
> Yes, 400MB swap, only a small fraction of it used; vmstat 5 looks okay
> and shows no understandable reason for the error message.  Here are a
> few lines from vmstat: the point at which free memory jumps up is just
> after the "Write failed: Cannot allocate memory" message:
>
>  2  0  0   9276   1792   8952 110388   0   0   378     0 2400   295  11  26  63
>
>  2  0  0   9276   1760   8952 110420   0   0     0     0  492   319   6   2  92
>
>  3  0  0   9276   1596   8952 110588   0   0    96     0  754   326   8   5  87
>
>  2  1  0   9276   1620   8828 110692   0   0   751   207 5378   275  19  74   7
>
>  1  0  0   9276  26680   8828  91760   0   0   115     0 1094   307   9  11  80
>
>  2  0  0   9276  26680   8828  91760   0   0     0     0  120   318   4   1  95
>
> I have many hundreds of MB or GB of disk space in the various
> partititions.  I will try the newer kernel, though I am interested in
> understanding what's going on here too.
>
> --
> Nick Urbanik, Dept. of Computing and Mathematics
> Hong Kong Institute of Vocational Education (Tsing Yi)
> email: nicku@vtc.edu.hk
> Tel:   (852) 2436 8576, (852) 2436 8579   Fax: (852) 2435 1406
> pgp ID: 7529555D fingerprint: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/

--
Nick Urbanik, Dept. of Computing and Mathematics
Hong Kong Institute of Vocational Education (Tsing Yi)
email: nicku@vtc.edu.hk
Tel:   (852) 2436 8576, (852) 2436 8579   Fax: (852) 2435 1406
pgp ID: 7529555D fingerprint: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B



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Re: rsync + ssh fail on raid; okay on 2.2.x

[Nick Urbanik]

Mark Hahn wrote:

> > Kernel: 2.4.0, no patches
>
> use 2.4.1-pre8.  much better VM tuning.

Thank you Mark, I will try that.

> > PIII 450MHz, 256MB RAM, Acus P3B-F motherboard (Intel 440BX)
> > Mail going to Raid 1 device
> > The file Inbox is only 2.9MB
> > OS = Red Hat 7 with all updates, both home and work.
> > Same with ppp 2.3.x and ppp 2.4.0
> > Same whether work machine runs 2.2.16 or 2.4.0 kernel.
>
> any swap?

Yes, 400MB swap, only a small fraction of it used; vmstat 5 looks okay
and shows no understandable reason for the error message.  Here are a
few lines from vmstat: the point at which free memory jumps up is just
after the "Write failed: Cannot allocate memory" message:

 2  0  0   9276   1792   8952 110388   0   0   378     0 2400   295  11  26  63

 2  0  0   9276   1760   8952 110420   0   0     0     0  492   319   6   2  92

 3  0  0   9276   1596   8952 110588   0   0    96     0  754   326   8   5  87

 2  1  0   9276   1620   8828 110692   0   0   751   207 5378   275  19  74   7

 1  0  0   9276  26680   8828  91760   0   0   115     0 1094   307   9  11  80

 2  0  0   9276  26680   8828  91760   0   0     0     0  120   318   4   1  95

I have many hundreds of MB or GB of disk space in the various
partititions.  I will try the newer kernel, though I am interested in
understanding what's going on here too.

--
Nick Urbanik, Dept. of Computing and Mathematics
Hong Kong Institute of Vocational Education (Tsing Yi)
email: nicku@vtc.edu.hk
Tel:   (852) 2436 8576, (852) 2436 8579   Fax: (852) 2435 1406
pgp ID: 7529555D fingerprint: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B



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