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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