From: ivanr@melbourne.sgi.com (Ivan Rayner)
Date: Wed, 13 Jun 2001 12:32:43 +1000
To: Russel Ingram <ringram@gargoylecc.com>
cc: <linux-xfs@oss.sgi.com>
Subject: Re: xfsdump, paride tape, and -m option
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On Tue, 12 Jun 2001, Russel Ingram wrote:

> On Wed, 13 Jun 2001, Ivan Rayner wrote:
>
> > Well, even if it is a hardware problem, it'd be nice if xfsdump didn't
> > core dump.  Would you be able to send me the output of 'xfsdump -v5 ...'
> > and the core file?
>
> I can't seem to get the error messages to redirect to the file so here are
> the error messages I got this time:
>
> sh: xfsdq: command not found
> sh: xfsdq: command not found

These errors indicate that xfsdq/xfsrq weren't installed.  If you want
your quota information included in the dump, you should install them.  I
think they're part of the xfsdump package.  If you don't care, then you
can ignore these errors.

> xfsdump: drive_minrmt.c:2201: do_end_write: Assertion `first_rec_w_err >=
> 0' failed.
> Aborted (core dumped)

It looks as though the following code failed with errno == 22 (Invalid
argument):

cmd/xfsdump/common/drive_minrmt.c:

	rval = ioctl( fd, MTIOCTOP, &mop );
	if ( rval < 0 ) {
		/* failure
	 	 */
		mlog( MLOG_DEBUG | MLOG_DRIVE,
		      "tape op %s %d returns %d: errno == %d (%s)\n",
		      printstr,
		      param,
		      rval,
		      errno,
		      strerror( errno ));
		return -1;
	}

where mop.mt_op == MTWEOF and mop.mt_count == 1, which later triggered
the assertion failure and core dump.

In other words, your hardware/driver didn't want to write an
end-of-file record.  You could try running 'mt weof 1' from the command
line to verify my assertion.

What driver does your tape drive use?  You could possibly take a look
at the source and see how it handles the MTIOCTOP (MTWEOF) ioctl.  For
example, you can see the scsi tape driver code for this at
linux/drivers/scsi/st.c line 2223.

Ivan

-- 
Ivan Rayner
ivanr@melbourne.sgi.com