SUMMARY: Broken Pipe on remote dump

From: Steve Simmons (
Date: Mon Aug 16 1993 - 01:35:14 CDT

I wrote:

>We're having a problem doing remote dumps from a Sun to an Ultrix
>box. I'm morally certain that we have a configuration problem
>somewhere, but haven't been able to put my finger on it.
>The source machine is a sun ipx recently upgraded from SunOS 4.1.1 to
>4.1.3, and is the YP master for an independently maintained domain.
>Before the upgrade we had no problems. Since the upgrade, the remote
>dump fails immediately after beginning the actual tape writes. Error
>message is "broken pipe".
>Contributing data - the same error occurs no matter which Sun you
>attempt the dump from -- all the machines in the YP domain now get
>"broken pipe".
>The machines with attached tape drives are DecSystems 5500s running
>Ultrix 4.2A. They happily rdump each other.
>I've tried making the machines darned near promiscuous to each other -
>as root from any machine involved you can do "rsh othermachine echo hi"
>and get the echo. Rlogins from the Ultrix machines to the YP master
>do seem to hang occasionally, telnets are always fine.

Here's a rare occurance -- SunManagers struck out, but almost by accident
we found a workaround.

I was setting up an ethernet sniffer to grab the rmt stream, and while
testing the sniffer setup was giving rdump commands. I was shocked when
"dump -if hela:/dev/nrmt3h /dev/rsd0a" worked! But the full command with
density and length failed. A brute force test showed that any attempt to
specify a density on the tape (DEC 8mm, 2.3GB) caused a broken pipe. Didn't
matter what density you specified, the pipe broke immediately. So we
stopped specifying the density and lied about the tape length, and all
works fine.

Since we're doing a major OS upgrade on the both the Sun and the DEC
involved in the next month or so, we're not going to pursue it further
unless it still occurs after that.

Many thanks to the suggestions from:

edguer@alpha.CES.CWRU.Edu (Aydin Edguer) (Dan Stromberg) (Paulo Licio de Geus) (Rod Livingood) (Robert J Wolf)
tommy@boole.uucp (Tommy Reingold) (Ron Vasey)

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