mirror of https://github.com/tLDP/LDP
467 lines
12 KiB
XML
467 lines
12 KiB
XML
<chapter id="selectact"><title>Selectively activating volumes and objects</title>
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<para>This chapter discusses selective activation and
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deactivation of EVMS volumes and objects.
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</para>
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<sect1 id="initialactivation"><title>Initial activation using /etc/evms.conf</title>
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<para>
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There is a section in the EVMS configuration file,
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<filename>/etc/etc/evms.conf</filename>, named "activate."
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This section has two entries: "include" and "exclude." The
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"include" entry lists the volumes and objects that should be activated.
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The "exclude" entry lists the volumes and objects that should not be
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activated.
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</para>
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<para>
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Names in either of the entries can be specified using "*", "?", and
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"[...]" notation. For example, the following entry will activate
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all the volumes:
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</para>
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<programlisting>
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include = [/dev/evms/*]
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</programlisting>
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<para>
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The next entry specifies that objects sda5 and sda7 not be activated:
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</para>
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<programlisting>
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exclude = [ sda[57] ]
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</programlisting>
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<para>When EVMS is started, it first reads the include entry and builds a list
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of the volumes and objects that it should activate. It then reads the
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exclude entry and removes from the list any names found in the exclude list.
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For example, an activation section that activates all of the volumes
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except <filename>/dev/evms/temp</filename> looks like this:
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</para>
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<programlisting>
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activate {
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include = [/dev/evms/*]
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exclude = [/dev/evms/temp]
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}
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</programlisting>
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<para>
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If <filename>/etc/evms.conf</filename> does not contain an activate
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section, the default behavior is to activate everything. This
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behavior is consistent with versions of EVMS prior to 2.4.
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</para>
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<para>
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Initial activation via <filename>/etc/evms.conf</filename> does not
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deactivate any volumes or objects. It only determines which ones
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should be active.
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</para>
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</sect1>
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<sect1><title>Activating and deactivating volumes and objects</title>
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<para>
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The EVMS user interfaces offer the ability to activate or deactivate
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a particular volume or object. The volume or object will be
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activated or deactivated when the changes are saved.
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</para>
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<sect2><title>Activation</title>
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<para>
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You can activate inactive volumes and objects using the various EVMS
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user interfaces.
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</para>
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<note><title>Note</title>
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<para>
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EVMS does not currently update the EVMS configuration file
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(<filename>/etc/evms.conf</filename>) when volumes and objects are
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activated. If you activate a volume or object that is not initially
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activated and do not make the corresponding change in
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<filename>/etc/evms.conf</filename>, the volume or object will not be
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activated the next time the system is booted and you run
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<command>evms_activate</command> or one of the user interfaces.
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</para>
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</note>
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<sect3><title>Using the EVMS GUI</title>
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<para>To activate volumes or objects with the GUI, follow these steps:
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<orderedlist>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Activation</guimenuitem>
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<guimenuitem>Activate...</guimenuitem>
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</menuchoice>
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</para>
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</listitem>
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<listitem>
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<para>Select the volume(s) and object(s) you want to activate.
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</para>
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</listitem>
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<listitem><para>
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Click <guibutton>Activate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Click <guibutton>Save</guibutton> to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the EVMS GUI context-sensitive menu</title>
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<para>To activate with the GUI context-sensitive menu, follow these steps:
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<orderedlist>
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<listitem>
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<para>
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Right click the volume or object you want to activate.
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</para>
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</listitem>
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<listitem><para>
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Click "Activate."
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</para>
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</listitem>
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<listitem><para>
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Click <guibutton>Activate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Click <guibutton>Save</guibutton> to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3>
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<title>Using Ncurses</title>
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<para>To activate a volume or object with Ncurses, follow these steps:
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<orderedlist>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Activation</guimenuitem>
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<guimenuitem>Activate...</guimenuitem>
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</menuchoice>
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</para>
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</listitem>
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<listitem>
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<para>Select the volume(s) and object(s) you want to activate.
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</para>
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</listitem>
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<listitem><para>
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Select <guibutton>Activate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Save</guimenuitem>
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</menuchoice>
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to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the Ncurses context-sensitive menu</title>
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<para>To enable activation on a volume or object with the
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Ncurses context-sensitive menu, follow these steps:
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<orderedlist>
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<listitem>
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<para>
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Highlight the volume or object you want to activate and press
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<keycap>Enter</keycap>.
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</para>
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</listitem>
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<listitem><para>
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Select "Activate."
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</para>
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</listitem>
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<listitem><para>
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Select <guibutton>Activate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Save</guimenuitem>
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</menuchoice>
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to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the CLI</title>
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<para>To activate a volume or object with the CLI,
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issue the following command to the CLI (where "name" is the name of
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the volume or object you want to activate):</para>
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<programlisting>
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Activate:name
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</programlisting>
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</sect3>
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</sect2>
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<sect2><title>Deactivation</title>
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<para>
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You can deactivate active volumes and objects using the various EVMS
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user interfaces.
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</para>
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<note><title>Note</title>
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<para>
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EVMS does not currently update the EVMS configuration file
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(<filename>/etc/evms.conf</filename>) when a volume or object is
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deactivated.
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If you deactivate a volume or object that is initially activated and
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do not make the corresponding change in <filename>/etc/evms.conf</filename>,
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then the volume or object will be activated the next time you run
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<command>evms_activate</command> or one of the user interfaces.
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</para>
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</note>
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<sect3><title>Using the EVMS GUI</title>
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<para>To deactivate a volume or object with the GUI, follow these steps:
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<orderedlist>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Activation</guimenuitem>
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<guimenuitem>Deactivate...</guimenuitem>
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</menuchoice>
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</para>
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</listitem>
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<listitem>
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<para>Select the volume(s) and object(s) you want to deactivate.
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</para>
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</listitem>
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<listitem><para>
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Click <guibutton>Deactivate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Click <guibutton>Save</guibutton> to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the EVMS GUI context-sensitive menu</title>
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<para>To deactivate a volume or object with the GUI
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context-sensitive menu, follow these steps:
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<orderedlist>
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<listitem>
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<para>
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Right click the volume or object you want to deactivate.
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</para>
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</listitem>
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<listitem><para>
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Click "Deactivate."
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</para>
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</listitem>
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<listitem><para>
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Click <guibutton>Deactivate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Click <guibutton>Save</guibutton> to save the changes and
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activate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using Ncurses</title>
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<para>To deactive a volume or object with Ncurses, follow these steps:
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<orderedlist>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Activation</guimenuitem>
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<guimenuitem>Deactivate...</guimenuitem>
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</menuchoice>
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</para>
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</listitem>
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<listitem>
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<para>Select the volume(s) and object(s) you want to deactivate.
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</para>
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</listitem>
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<listitem><para>
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Select <guibutton>Deactivate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Save</guimenuitem>
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</menuchoice>
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to save the changes and
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deactivate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the Ncurses context-sensitive menu</title>
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<para>To deactivate a volume or object with the
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Ncurses context-sensitive menu, follow these steps:
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<orderedlist>
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<listitem>
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<para>
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Highlight the volume or object you want to deactivate and press
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<keycap>Enter</keycap>.
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</para>
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</listitem>
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<listitem><para>
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Select "Deactivate."
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</para>
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</listitem>
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<listitem><para>
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Select <guibutton>Deactivate</guibutton>.
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</para></listitem>
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<listitem>
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<para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Save</guimenuitem>
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</menuchoice>
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to save the changes and
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deactivate the volume(s) and object(s).
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</para>
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</listitem>
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</orderedlist>
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</para>
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</sect3>
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<sect3><title>Using the CLI</title>
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<para>To deactivate a volume or object with the CLI,
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issue the following command to the CLI (where "name" is the name of
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the volume or object you want to deactivate):</para>
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<programlisting>
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Deactivate:name
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</programlisting>
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</sect3></sect2>
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<sect2><title>Activation and deactivation dependencies</title>
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<para>
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In order for a volume or object to be active, all of its children
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must be active. When you activate a volume or object, EVMS will
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activate all the objects that the volume or object comprises.
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</para>
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<para>
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Similarly, in order for an object to be inactive, all of its
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parents cannot be activate. When you deactivate an object, EVMS
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will deactivate all of the objects and volumes that are built from
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that object.
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</para>
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<sect3><title>Dependencies during initial activation</title>
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<para>
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As discussed in <xref linkend="initialactivation"></xref>,
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when EVMS starts, it builds an initial list of
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volumes and objects whose names match the "include" entry in the
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activation section of <filename>/etc/evms.conf</filename>. Because those
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volumes and objects cannot be active unless the objects they comprise are
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active, EVMS then adds to the list all the objects that are comprised by
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the volumes and objects that were found in the initial match.
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</para>
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<para>
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EVMS then removes from the list the volumes and objects whose names
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match the "exclude" entry in the activation section of
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<filename>/etc/evms.conf</filename>. Because any volumes or objects
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that are built from the excluded ones cannot be active, EVMS removes
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them from the list as well.
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</para>
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<para>
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The enforcement of the dependencies can result in behavior that is not
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immediately apparent.
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Let's say, for example, that segment hda7 is made into volume
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<filename>/dev/evms/home</filename>. and the activation section in
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<filename>/etc/evms.conf</filename> looks like this:
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</para>
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<programlisting>
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activate {
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include = [*]
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exclude = [hda*]
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}
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</programlisting>
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<para>
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When EVMS builds the list of volumes and objects to activate,
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everything is included. EVMS next removes all objects whose names
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start with "hda." hda7 will be removed from the list.
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Next, because volume <filename>/dev/evms/home</filename> is built
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from hda7, it will also be removed from the list and will not be
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activated.
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So, although volume <filename>/dev/evms/home</filename> is not
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explicitly in the exclude list, it is not activated because it
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depends on an object that will not be activated.
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</para>
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</sect3>
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<sect3><title>Dependencies for compatibility volumes</title>
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<para>
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Compatibility volumes are made directly from the volume's object.
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That is, the device node for the volume points directly to the device
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for the volume's object.
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Because a compatibility volume is inseparable from its object, a
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compatibility volume itself cannot be deactivated.
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To deactivate a compatibility volume you must deactivate the volume's object.
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</para>
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<para>
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Similarly, if a compatibility volume and its object are not active
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and you activate the volume's object, the compatibility volume will be
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active as well.
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</para>
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</sect3>
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</sect2>
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</sect1>
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</chapter>
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