<para><command>&dhpackage;</command> allows to configure the
nbd-server.</para>
- <para>The default configuration file is
- <filename>@sysconfdir@/nbd-server/config</filename>, but this
- can be varied with the <option>-C</option> option to
- <command>nbd-server</command>(1).
+ <para>While
+ <filename>@sysconfdir@/nbd-server/config</filename> is the default
+ configuration file, this can be varied with the <option>-C</option>
+ option to <command>nbd-server</command>(1).
</para>
<para>
The configuration file consists of section header lines, comment
</listitem>
</varlistentry>
</variablelist>
+ </refsect1>
<refsect1>
<title>OPTIONS FOR EXPORT SECTIONS</title>
</listitem>
</varlistentry>
<varlistentry>
- <term><option>autoreadonly</option></term>
- <listitem>
- <para>Optional; boolean.</para>
- <para>
- If this option is set to true, then
- <command>nbd-server</command> will automatically switch to
- readonly if it cannot write to the file.
- </para>
- <para>Does not have a corresponding command-line
- argument</para>
- <para>TODO: verify whether this option actually works as
- documented. I have a feeling I've been terribly
- stupid.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
<term><option>copyonwrite</option></term>
<listitem>
<para>
</listitem>
</varlistentry>
<varlistentry>
+ <term>listenaddr</term>
+ <listitem>
+ <para>Optional; string</para>
+ <para>If this option is set, it should contain the local IP
+ address (in "dotted-quad" notation) on which we should
+ listen to <command>nbd-client</command>(8) connections. If
+ it is not set, 0.0.0.0 is used (i.e., "listen on all local
+ IP addresses")</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term><option>multifile</option></term>
<listitem>
<para>Optional; boolean.</para>
</listitem>
</varlistentry>
<varlistentry>
+ <term><option>sdp</option></term>
+ <listitem>
+ <para>Optional; boolean.</para>
+ <para>
+ When this option is enabled, <command>nbd-server</command>
+ will use the Socket Direct Protocol (SDP) to serve the
+ export, rather than just IP. This is faster, but requires
+ special hardware (usually something like InfiniBand) and
+ support in the kernel.
+ </para>
+ <para>
+ Additionally, support for this option must be enabled at
+ compile time, using the <option>--enable-sdp</option> option
+ to the <command>configure</command> script. If this option
+ is found in a configuration file and
+ <command>nbd-server</command> does not have support for SDP,
+ then <command>nbd-server</command> will exit with an error
+ message.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><option>sync</option></term>
+ <listitem>
+ <para>Optional; boolean.</para>
+ <para>When this option is enabled,
+ <command>nbd-server</command> will call an fsync() after every
+ write to the backend storage. Calling fsync() increases
+ reliability in case of an unclean shutdown of nbd-server; but,
+ depending on the file system used on the nbd-server side, may
+ degrade performance. The use of this option isn't always
+ necessary; e.g., on ext3 filesystems, it is recommended that
+ it is <emphasis>not</emphasis> enabled, since it seriously
+ reduces performance on ext3 filesystems while not
+ importantly impacting performance.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
<term><option>sparse_cow</option></term>
<listitem>
<para>Optional; boolean.</para>