NetNews Usenet Archive 1992 #30/NN_1992_30.iso/spool/comp/sys/next/sysadmin/7093

Text File | 1992-12-17 | 1.8 KB | 59 lines

Path: sparky!uunet!cs.utexas.edu!sdd.hp.com!spool.mu.edu!umn.edu!noc.msc.net!gacvx2.gac.edu!nntp-server!max
Newsgroups: comp.sys.next.sysadmin
Subject: Re: Dump/restore problem with DAT-drive (Major hint!!!)
Message-ID: <[e-mail]>
From: [e-mail] (Max Hailperin)
Date: 16 Dec 92 10:49:19
Reply-To: Max Hailperin <[e-mail]>
References: <[e-mail]> <[e-mail]><[e-mail]>
Organization: Gustavus Adolphus College, St. Peter, MN
Nntp-Posting-Host: kolmogorov.gac.edu
In-reply-to: [e-mail]'s message of 16 Dec 92 10:21:12Lines: 45
Lines: 45

In article <[e-mail]>
[e-mail] (Max Hailperin) (yes that's me) writes:

   [A bunch of stuff about tape read errors that would have been
    correct, except that I'm brain dead and got "allow" and "inhibit"
    backwards.]

The correct mode of operation for restoring from a DAT drive is
*inhibit* illegal length, *not* allow.  This is what Sears's
workaround does by using the exabyte device.  The correct solution,
then, is *not* the mtalill program I posted, but rather the converse,
which I naturally call mtinill.  This is what I actually run in my
/etc/rc.local.  Please excuse my earlier error.

#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <nextdev/scsireg.h>
#include <sys/file.h>

main(int argc, char *argv[]){
  int fd;

  if(argc != 2){
    fprintf(stderr, "Usage: %s device\n", argv[0]);
    exit(1);
    }

  if((fd = open(argv[1], O_RDONLY, 0)) < 0){
    perror(argv[1]);
    exit(1);
  }

  if(ioctl(fd, MTIOCINILL, NULL) < 0){
    perror("doing MTIOCINILL ioctl");
    exit(1);
  }

  if(close(fd) < 0){
    perror("closing");
    exit(1);
  }

  exit(0);
}