svn commit: r44508 - head/en_US.ISO8859-1/books/handbook/disks

Dru Lavigne dru at FreeBSD.org
Wed Apr 9 17:57:02 UTC 2014


Author: dru
Date: Wed Apr  9 17:57:01 2014
New Revision: 44508
URL: http://svnweb.freebsd.org/changeset/doc/44508

Log:
  Editorial Review of Tape Backup chapter.
  The next commit will integrate it into the Backup Basics chapter.
  
  Sponsored by:	iXsystems

Modified:
  head/en_US.ISO8859-1/books/handbook/disks/chapter.xml

Modified: head/en_US.ISO8859-1/books/handbook/disks/chapter.xml
==============================================================================
--- head/en_US.ISO8859-1/books/handbook/disks/chapter.xml	Wed Apr  9 15:54:45 2014	(r44507)
+++ head/en_US.ISO8859-1/books/handbook/disks/chapter.xml	Wed Apr  9 17:57:01 2014	(r44508)
@@ -1680,78 +1680,66 @@ cd0: Attempt to query device size failed
 
     <indexterm><primary>tape media</primary></indexterm>
 
-    <para>Tape technology has continued to evolve but is less likely
-      to be used in a modern system.  Modern backup systems tend to
-      use off site combined with local removable disk drive
-      technologies.  Still, &os; will support any tape drive that
-      uses <acronym>SCSI</acronym>, such as LTO and older devices such
-      as DAT.  There is limited support for <acronym>SATA</acronym>
+    <para>While tape technology has continued to evolve,
+      modern backup systems tend to combine
+      off-site backups with local removable media.
+      &os; supports any tape drive that
+      uses <acronym>SCSI</acronym>, such as <acronym>LTO</acronym> or
+      <acronym>DAT</acronym>.  There is limited support for <acronym>SATA</acronym>
       and <acronym>USB</acronym> tape drives.</para>
 
-    <sect2 xml:id="tapes-sa0">
-      <title>Serial Access with &man.sa.4;</title>
-
-      <indexterm>
-	<primary>tape drives</primary>
-      </indexterm>
-
-      <para>&os; uses the &man.sa.4; driver, providing
+      <para>For <acronym>SCSI</acronym> tape devices, &os; uses the &man.sa.4; driver and the
 	<filename>/dev/sa0</filename>, <filename>/dev/nsa0</filename>,
-	and <filename>/dev/esa0</filename>.  In normal use, only
-	<filename>/dev/sa0</filename> is needed.
-	<filename>/dev/nsa0</filename> is the same physical drive
-	as <filename>/dev/sa0</filename> but does not rewind the
-	tape after writing a file.  This allows writing more than one
+	and <filename>/dev/esa0</filename> devices.  The physical device name is
+	<filename>/dev/sa0</filename>.  When
+	<filename>/dev/nsa0</filename> is used, the backup application will
+	not rewind the
+	tape after writing a file, which allows writing more than one
 	file to a tape.  Using <filename>/dev/esa0</filename>
-	ejects the tape after the device is closed, if
-	applicable.</para>
-    </sect2>
+	ejects the tape after the device is closed.</para>
+
+    <para>This section summarizes how to configure and use a
+      <acronym>SCSI</acronym> tape device on &os;.</para>
 
     <sect2>
-      <title xml:id="tapes-mt">Controlling the Tape Drive with
-	&man.mt.1;</title>
+      <title xml:id="tapes-mt">Using a Tape Drive for Backups</title>
 
       <indexterm>
 	<primary>tape media</primary>
 	<secondary>mt</secondary>
       </indexterm>
 
-      <para>&man.mt.1; is the &os; utility for controlling other
+      <para>In &os;, <command>mt</command> is used to control
 	operations of the tape drive, such as seeking through files on
-	a tape or writing tape control marks to the tape.</para>
-
-      <para>For example, the first three files on a tape can be
+	a tape or writing tape control marks to the tape.  For
+	example, the first three files on a tape can be
 	preserved by skipping past them before writing a new
 	file:</para>
 
       <screen>&prompt.root; <userinput>mt -f /dev/nsa0 fsf 3</userinput></screen>
-    </sect2>
-
-    <sect2>
-      <title xml:id="tapes-tar">Using &man.tar.1; to Read and
-	Write Tape Backups</title>
-
-      <para>An example of writing a single file to tape using
-	&man.tar.1;:</para>
+      
+      <para>This utility supports many operations.  Refer to
+	&man.mt.1; for details.</para>
+
+      <para>To write a single file to tape using
+	<command>tar</command>, specify the name of the tape device
+	and the file to backup:</para>
 
       <screen>&prompt.root; <userinput>tar cvf /dev/sa0 <replaceable>file</replaceable></userinput></screen>
 
-      <para>Recovering files from a &man.tar.1; archive on tape into
+      <para>To recovering files from a <command>tar</command> archive on tape into
 	the current directory:</para>
 
       <screen>&prompt.root; <userinput>tar xvf /dev/sa0</userinput></screen>
-    </sect2>
-
-    <sect2>
-      <title xml:id="tapes-dumprestore">Using &man.dump.8; and
-	&man.restore.8; to Create and Restore Backups</title>
 
-      <para>A simple backup of <filename>/usr</filename> with
-	&man.dump.8;:</para>
+      <para>To backup a <acronym>UFS</acronym> file system, use
+	<command>dump</command>.  This examples backs up
+	<filename>/usr</filename> without rewinding the tape when
+	finished:</para>
 
       <screen>&prompt.root; <userinput>dump -0aL -b64 -f /dev/nsa0 /usr</userinput></screen>
 
-      <para>Interactively restoring files from a &man.dump.8; file on
+      <para>To interactively restore files from a <command>dump</command> file on
 	tape into the current directory:</para>
 
       <screen>&prompt.root; <userinput>restore -i -f /dev/nsa0</userinput></screen>
@@ -1760,7 +1748,7 @@ cd0: Attempt to query device size failed
     <sect2>
       <title xml:id="tapes-othersofware">Other Tape Software</title>
 
-      <para>Higher-level programs are available to simplify tape
+      <para>Third-party programs are available to simplify tape
 	backup.  The most popular are
 	<application>Amanda</application> and
 	<application>Bacula</application>.  These programs aim to make


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