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From: dennis@PEANUTS.NOSC.MIL.UUCP
Newsgroups: comp.sys.apollo
Subject: Apollo tar to VAX select error
Message-ID: <8708172232.AA26570@cod.nosc.mil>
Date: Mon, 17-Aug-87 18:35:12 EDT
Article-I.D.: cod.8708172232.AA26570
Posted: Mon Aug 17 18:35:12 1987
Date-Received: Wed, 19-Aug-87 07:24:29 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 31

Another tar-over-the-ethernet-to-a-VAX question:

I am trying to backup files by writing to a VAX tape drive.  The following
command (with various blocking factor combinations) executed on an Apollo
 
    tar cfv - files | rsh vax '/bin/dd obs=20b of=/dev/rmt0'

results in the following two messages

    select: I/O error
    select: I/O error

This doesn't happen when I duplicate the data and copy from one VAX
to another.  Nor does it happen when I write to a simple file on
the VAX side, as

    tar cbfv 20 - files | rsh vax '/bin/dd obs=20b of=spool.dump'

Amazingly, however, the error does occur when I add a delay

    tar cbfv 20 - files | rsh vax 'sleep 60; /bin/dd obs=20b of=spool.dump'

but not when going from VAX to VAX.

I'm ready for some help on this.  Why does the Apollo work
differently?  Empirical programming is soooo frustrating without any
data to work with.  [The gateway is a DSP80A with Interlan Ethernet
card running SR9.2.3 and TCP2.2.  The VAXes are all running BSD4.3.]

	Dennis Cottel  Naval Ocean Systems Center, San Diego, CA  92152
	(619) 225-2406     dennis@nosc.ARPA      sdcsvax!noscvax!dennis