From:	CSBVAX::CSBVAX::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX" 28-MAR-1989 14:33
To:	MRGATE::"ARISIA::EVERHART"
Subj:	RE: Backing up over DECnet (to tape!)


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Date: Tue, 28 Mar 89 10:37 PST
From: SEYMOUR%phast.phys.washington.edu@CUNYVM.CUNY.EDU
Subject: RE: Backing up over DECnet (to tape!)
To: info-vax@kl.sri.com
X-VMS-To: IN%"info-vax@kl.sri.com"

<IN%"STEVENS@rad.hup.upenn.edu"  "Fred Stevens"> asked about
backing up over DECnet.  i responded. then he sort-of asked a followup:

<I take it that this means that it is NOT possible to
<do a disk to tape backup directly over the DECnet.

And the answer is:
 You CAN backup over the network (sort of) directly to tape!
Limits:
 You cannot RESTORE without intermediate disk space somewhere.
 Unless you greatly increase your network timeouts, you
    are limited to backups which fit on a single tape reel.
    (oh, the joys of 8mm tapes!)

Here's how to do it (with thanks to Jim Belonis, SysMan of UWAPHAST):

$! On the node with the tapedrive (XXX:: in this case),
$!  put this NETBACK.COM FILE in the login area
$! of the account proxied to the other system's user or install it
$! as a known DECnet object (see below).  The procedure is:
$!--------------start of netback.com----------------------
$ ALLOCATE  MSA0:
$ INITIALIZE /DENSITY=6250/over=owner    MSA0:    BACKUP
$ MOUNT /BLOCK=4096     MSA0:   backup
$ ON ERROR THEN $ GOTO FINISH
$ CONVERT /FDL=SYS$INPUT    SYS$NET:    MSA0:BACKUP.BCK
RECORD
    FORMAT FIXED
    SIZE 4096
$!
$FINISH:
$ DISMOUNT  MSA0:
$ DEALLOCATE  MSA0:
$ EXIT
$!-----------------end of netback.com---------------

On the system with the disk you're backing up, do (for example):
     $ BACKUP  [*...]  XXX::"TASK=netBACK"/SAVE_SET/BLOCK=4096
 and the [*...] directory tree will be saved across the network.


This ONLY works to put the FIRST saveset on a tape
(unless you adjust network timings -- DECnet times out during long
 magtape operations, such as find-end-of-file)
--- dick seymour@uwaphast

p.s. to Fred Stevens:
 could you supply an address or phone number which works directly???

