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Multiple tweaks.

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PR:		docs/42125
Submitted by:	Martin Heinen <martin@sumuk.de>
This commit is contained in:
Ceri Davies 2002-08-28 21:18:20 +00:00
parent 6b04bdb5d5
commit d6598049e1
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=14068
1 changed files with 19 additions and 14 deletions
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en_US.ISO8859-1/books/handbook/disks/chapter.sgml
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@ -1467,36 +1467,38 @@ sa0(ncr1:4:0): Logical unit is in process of becoming ready</screen>
these are typically mount points for other filesystems or these are typically mount points for other filesystems or
symbolic links into those filesystems.</para></note> symbolic links into those filesystems.</para></note>
<para><command>dump</command>has quirks that remain from its early days in <para><command>dump</command> has quirks that remain from its early days in
Version 6 of AT&amp;T Unix (circa 1975). The default Version 6 of AT&amp;T Unix (circa 1975). The default
parameters are suitable for 9-track tapes (6250 bpi), not the parameters are suitable for 9-track tapes (6250 bpi), not the
high-density media available today (up to 62,182 ftpi). These high-density media available today (up to 62,182 ftpi). These
defaults must be overridden on the command line to utilize the defaults must be overridden on the command line to utilize the
capacity of current tape drives.</para> capacity of current tape drives.</para>
<indexterm><primary><filename>rhosts</filename></primary></indexterm> <indexterm><primary><filename>.rhosts</filename></primary></indexterm>
<para>It is also possible to backup data across the network to a <para>It is also possible to backup data across the network to a
tape drive attached to another computer with <command>rdump</command> and tape drive attached to another computer with <command>rdump</command> and
<command>rrestore</command>. Both programs rely upon <command>rcmd</command> and <command>rrestore</command>. Both programs rely upon <command>rcmd</command> and
<command>ruserok</command> to access the remote tape drive. Therefore, <command>ruserok</command> to access the remote tape drive. Therefore,
the user performing the backup must have the user performing the backup must be listed in the
<literal>rhosts</literal> access to the remote computer. The <filename>.rhosts</filename> file on the remote computer. The
arguments to <command>rdump</command> and <command>rrestore</command> must be suitable arguments to <command>rdump</command> and <command>rrestore</command> must be suitable
to use on the remote computer. (e.g. When to use on the remote computer. When
<command>rdump</command>ing from a FreeBSD computer to an <command>rdump</command>ing from a FreeBSD computer to an
Exabyte tape drive connected to a Sun called Exabyte tape drive connected to a Sun called
<hostid>komodo</hostid>, use: <command>/sbin/rdump 0dsbfu <hostid>komodo</hostid>, use:</para>
54000 13000 126 komodo:/dev/nrsa8 /dev/rda0a
2>&amp;1</command>) Beware: there are security implications to <screen>&prompt.root; <userinput>/sbin/rdump 0dsbfu 54000 13000 126 komodo:/dev/nrsa8 /dev/rda0a 2>&amp;1</userinput></screen>
allowing <literal>rhosts</literal> commands. Evaluate your
<para>Beware: there are security implications to
allowing <filename>.rhosts</filename> authentication. Evaluate your
situation carefully.</para> situation carefully.</para>
<para>It is also possible to use <command>rdump</command> and <para>It is also possible to use <command>dump</command> and
<command>rrestore</command> in a more secure fashion over <command>restore</command> in a more secure fashion over
<command>ssh</command>.</para> <command>ssh</command>.</para>
<example> <example>
<title>Using <command>rdump</command> over <application>ssh</application></title> <title>Using <command>dump</command> over <application>ssh</application></title>
<screen>&prompt.root; <userinput>/sbin/dump -0uan -f - /usr | gzip -2 | ssh1 -c blowfish \ <screen>&prompt.root; <userinput>/sbin/dump -0uan -f - /usr | gzip -2 | ssh1 -c blowfish \
targetuser@targetmachine.example.com dd of=/mybigfiles/dump-usr-l0.gz</userinput></screen> targetuser@targetmachine.example.com dd of=/mybigfiles/dump-usr-l0.gz</userinput></screen>
@ -1525,8 +1527,11 @@ sa0(ncr1:4:0): Logical unit is in process of becoming ready</screen>
<command>tar</command>, which FreeBSD utilizes, supports remote <command>tar</command>, which FreeBSD utilizes, supports remote
devices using the same syntax as <command>rdump</command>. To devices using the same syntax as <command>rdump</command>. To
<command>tar</command> to an Exabyte tape drive connected to a <command>tar</command> to an Exabyte tape drive connected to a
Sun called <hostid>komodo</hostid>, use: <command>/usr/bin/tar Sun called <hostid>komodo</hostid>, use:</para>
cf komodo:/dev/nrsa8 . 2>&amp;1</command>. For versions without
<screen>&prompt.root; <userinput>/usr/bin/tar cf komodo:/dev/nrsa8 . 2>&amp;1</userinput></screen>
<para>For versions without
remote device support, you can use a pipeline and remote device support, you can use a pipeline and
<command>rsh</command> to send the data to a remote tape <command>rsh</command> to send the data to a remote tape
drive.</para> drive.</para>