147 lines
5.5 KiB
HTML
147 lines
5.5 KiB
HTML
<!--startcut ======================================================= -->
|
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
|
|
<html><head>
|
|
<META NAME="generator" CONTENT="lgazmail v1.1D.l">
|
|
<TITLE>The Answer Guy 34:
|
|
Problems with a SCSI Tape Drive
|
|
</TITLE>
|
|
<!-- ORIGINAL SUBJECT:
|
|
Problems with backup
|
|
JTD SUBTITLE:
|
|
|
|
-->
|
|
</head>
|
|
|
|
<BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#A000A0"
|
|
ALINK="#FF0000">
|
|
<H4>"Linux Gazette...<I>making Linux just a little more fun!</I>"
|
|
</H4>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<H1 align="center"><A NAME="answer">
|
|
<img src="../../gx/dennis/qbubble.gif" alt="" border="0" align="middle">
|
|
<a href="../index.html">The Answer Guy</a>
|
|
<img src="../../gx/dennis/bbubble.gif" alt="" border="0" align="middle">
|
|
</A></H1>
|
|
<BR>
|
|
<H4 align="center">By James T. Dennis,
|
|
<a href="mailto:linux-questions-only@ssc.com">linux-questions-only@ssc.com</a>
|
|
<BR>Starshine Technical Services, <A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
|
|
</H4>
|
|
<p><hr><p>
|
|
<!--endcut ========================================================= -->
|
|
<H3><img src="../../gx/dennis/qbub.gif" alt="(?)"
|
|
width="50" height="28" align="left" border="0"
|
|
>Problems with a SCSI Tape Drive</H3>
|
|
<p><strong>From Ralf Schiemann on 23 Oct 1998 </strong></p>
|
|
<!-- begin body -->
|
|
|
|
|
|
<p><strong>Hi,
|
|
I've a problem with backing up our file server (Linux 2.0.33). Attached
|
|
to the server is a HP C1557A SCSI TapeLoader (6 x 24 GB). Actions on the
|
|
loader are done without any problems (e.g. loading and unloading of
|
|
tapes).
|
|
</strong></p>
|
|
|
|
<p><strong>But if I try to do a backup via tar (<tt>tar cvf /dev/st0 /tmp</tt>) the tape
|
|
display is telling me "Write" and after a short while "Tape Position
|
|
lost". In <tt>/var/log/messages</tt> I find the following errors:
|
|
</strong></p>
|
|
|
|
|
|
<pre>kernel: st0: Error with sense data: extra data not valid
|
|
Deferred error st09:00: sense key Medium Error
|
|
kernel: Additional sense indicates Sequential positioning error
|
|
kernel: st0: Error on write filemark.
|
|
</pre>
|
|
|
|
<p><strong>Can you tell me whats going wrong??
|
|
Any help is welcome,
|
|
<br>Ralf
|
|
</strong></p>
|
|
|
|
<blockquote><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)" height="28" width="50" align="bottom">I would look at SCSI termination and cabling problems.
|
|
It sounds like commands are getting through the interface
|
|
just fine, and streams of data are causing the problem.
|
|
</blockquote>
|
|
|
|
<blockquote>You don't say what kernel version nor which SCSI adapter and
|
|
drivers you're using. If this is a modular kernel, try
|
|
compiling the appropriate SCSI driver directly into it
|
|
(to eliminate any chance of anomalies with automatic loading
|
|
and removal of the SCSI drivers by kerneld, etc).
|
|
</blockquote>
|
|
|
|
<blockquote>Try compiling a very minimal kernel with just the
|
|
drivers you need to do your backup. You want to see if
|
|
there's some strange conflict between your drivers.
|
|
</blockquote>
|
|
|
|
<blockquote>Finally you might try testing this with a different
|
|
SCSI adapter, with no other peripherals on it and the
|
|
best cable you can buy. Is this an internal or external
|
|
unit? I'm guessing external since DAT autochangers are
|
|
pretty big for internal drive bays).
|
|
</blockquote>
|
|
|
|
<blockquote>If you can afford it, it's best to put your SCSI tape
|
|
drive on a separate SCSI card (a fairly cheap $60
|
|
ISA card is fine). This allows you to put the
|
|
tape drive off that system without having to reboot,
|
|
and it maximizes performance on the other bus.
|
|
</blockquote>
|
|
<!-- end body -->
|
|
|
|
<!--startcut ======================================================= -->
|
|
<P> <hr> <P>
|
|
<H5 align="center"><a href="http://www.linuxgazette.com/copying.html"
|
|
>Copyright ©</a> 1998, James T. Dennis <BR>
|
|
Published in <I>Linux Gazette</I> Issue 34 November 1998</H5>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<P align="center">
|
|
<table width="98%"><tr valign="center" align="center">
|
|
<td rowspan="3"><A HREF="../lg_answer34.html"><IMG
|
|
SRC="../../gx/dennis/answernew.gif"
|
|
ALT="[ Answer Guy Index ]"></A></td>
|
|
<td><A HREF="./apache.html">apache</a>
|
|
<td><A HREF="./current.html">current</a>
|
|
<td><A HREF="./digi.html">digi</a>
|
|
<td><A HREF="./ether.html">ether</a>
|
|
<td><A HREF="./goodtimes.html">goodtimes</a>
|
|
<td><A HREF="./intlX.html">intlX</a>
|
|
<td><A HREF="./largedisk.html">largedisk</a>
|
|
</tr><tr valign="center" align="center">
|
|
<td><A HREF="./maybe.html">maybe</a>
|
|
<td><A HREF="./numlock.html">numlock</a>
|
|
<td><A HREF="./quota.html">quota</a>
|
|
<td><A HREF="./recovery.html">recovery</a>
|
|
<td><A HREF="./script.html">script</a>
|
|
<td><A HREF="./serial.html">serial</a>
|
|
<td><A HREF="./session.html">session</a>
|
|
</tr><tr valign="center" align="center">
|
|
<td><A HREF="./sound.html">sound</a>
|
|
<td><A HREF="./tape.html">tape</a>
|
|
<td><A HREF="./testsuite.html">testsuite</a>
|
|
<td><A HREF="./w95ie.html">w95ie</a>
|
|
<td><A HREF="./w95ras.html">w95ras</a>
|
|
<td><A HREF="./w95virus.html">w95virus</a>
|
|
<td><A HREF="./xdm.html">xdm</a>
|
|
</tr></table>
|
|
</P>
|
|
<P> <hr> <P>
|
|
<!-- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -->
|
|
<A HREF="../index.html"><IMG SRC="../../gx/indexnew.gif"
|
|
ALT="[ Table Of Contents ]"></A>
|
|
<A HREF="../../index.html"><IMG SRC="../../gx/homenew.gif"
|
|
ALT="[ Front Page ]"></A>
|
|
<A HREF="../lg_bytes34.html"><IMG SRC="../../gx/back2.gif"
|
|
ALT="[ Previous Section ]"></A>
|
|
<A HREF="../izquierdo.html"><IMG SRC="../../gx/fwd.gif"
|
|
ALT="[ Next Section ]"></A>
|
|
</body>
|
|
</html>
|
|
<!--endcut ========================================================= -->
|
|
|