mirror of https://github.com/tLDP/LDP
156 lines
4.9 KiB
XML
156 lines
4.9 KiB
XML
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<chapter id="addfeatures"><title>Adding features to an existing volume</title>
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<para>This chapter tells how to add additional EVMS features to an
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already existing EVMS volume.
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</para>
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<sect1 id="whyadd"><title>Why add features to a volume?</title>
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<para>EVMS lets you add features such as drive linking to
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a volume that already exists. By adding features, you avoid having to potentially
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destroy the volume and recreate it from scratch. For example, take the
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scenario of a volume that contains important data but is almost full.
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If you wanted to add more data to that volume but no free space existed on the
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disk immediately after the segment, you could add a drive link to the volume.
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The drive link concatenates another object to the end of the volume and
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continues seamlessly.
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</para>
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</sect1>
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<sect1 id="exaddfeature"><title>Example: add drive linking to an existing volume</title>
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<para> The following example shows how to add drive linking to a volume with
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the EVMS GUI, Ncurses, and CLI interfaces.
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</para>
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<blockquote><example><title>Add drive linking to an existing volume</title>
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<para>The following sections show how to add a drive link to volume
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<filename>/dev/evms/vol</filename> and call the drive link "DL."
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</para>
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</example>
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<para><note><title>NOTE</title><para>Drive linking can be done only on
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EVMS volumes; therefore, <filename>/dev/evms/vol</filename> must be converted to an EVMS volume if it is not
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already. </para></note></para>
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</blockquote>
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<sect2 id="addfeaturegui"><title>Using the EVMS GUI</title>
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<para>Follow these steps to add a drive link to the volume with the EVMS GUI:
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<orderedlist>
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<listitem><para>Select <menuchoice><guimenu>Actions</guimenu>
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<guimenuitem>Add</guimenuitem><guimenuitem>Feature to Volume</guimenuitem></menuchoice>.
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</para>
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</listitem>
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<listitem><para>Select <guimenuitem>/dev/evms/vol</guimenuitem>
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</para></listitem>
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<listitem><para>Click <guibutton>Next</guibutton>.
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</para></listitem>
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<listitem><para>Select <guimenuitem>Drive Linking Feature</guimenuitem>.
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</para></listitem>
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<listitem><para>Click <guibutton>Next</guibutton>.
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</para></listitem>
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<listitem><para>Type <userinput>DL</userinput> in the Name Field.</para>
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</listitem>
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<listitem><para>Click <guibutton>Add</guibutton>.</para>
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</listitem>
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</orderedlist>
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</para>
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<para>Alternatively, you can perform some of the steps to add a drive link with the GUI
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context sensitive menu:</para>
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<orderedlist>
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<listitem><para>From the <guimenuitem>Volumes</guimenuitem> tab, right click
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<filename>/dev/evms/vol</filename>.</para></listitem>
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<listitem><para>Click <guimenuitem>Add feature...</guimenuitem></para></listitem>
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<listitem><para>Continue adding the drive link beginning with step 3 of the
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GUI instructions.</para></listitem>
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</orderedlist>
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</sect2>
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<!-- Ncurses-->
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<sect2 id="addfeaturesncurses"><title>Using Ncurses</title>
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<para>Follow these steps to add a drive link to a volume with Ncurses:
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<orderedlist>
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<listitem><para>Select <menuchoice><guimenu>Actions</guimenu><guimenuitem>Add</guimenuitem>
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<guimenuitem>Feature to Volume</guimenuitem></menuchoice>.
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</para></listitem>
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<listitem><para>Select
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<guimenuitem>/dev/evms/vol</guimenuitem>.
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</para></listitem>
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<listitem><para>Activate <guibutton>Next</guibutton>.
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</para></listitem>
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<listitem><para>Select
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<guimenuitem>Drive Linking Feature</guimenuitem>.
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</para></listitem>
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<listitem><para>Activate <guibutton>Next</guibutton>.
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</para></listitem>
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<listitem><para>Press <keycap>Spacebar</keycap> to edit the Name field.
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</para></listitem>
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<listitem><para>At the "::" prompt enter <userinput>DL</userinput>.
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</para></listitem>
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<listitem><para>Press <keycap>Enter</keycap>.
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</para></listitem>
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<listitem><para>Activate <guibutton>Add</guibutton>.</para></listitem>
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</orderedlist>
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</para>
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<para>Alternatively, you can perform some of the steps to add a drive link with the
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context sensitive menu:</para>
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<orderedlist>
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<listitem><para>From the Volumes view, press <keycap>Enter</keycap> on <guimenuitem>/dev/evms/vol</guimenuitem>.</para>
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</listitem>
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<listitem><para>Activate the <guimenuitem>Add feature</guimenuitem> menu item.</para>
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</listitem>
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<listitem><para>Continue adding the drive link beginning with step 3 of the Ncurses instructions.</para>
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</listitem>
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</orderedlist>
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</sect2>
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<!-- CLI-->
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<sect2 id="addfeaturescli"><title>Using the CLI</title>
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<para>Use the
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<command>add feature</command> to add a feature to an existing volume.
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Specify the command name followed by a colon, followed by any options
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and the volume to operate on. To determine the options for a given
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feature, use the following query:
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</para>
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<programlisting>query: plugins, plugin=DriveLink, list options</programlisting>
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<para>
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The option names and descriptions are listed to help you construct
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your command. For our example, the command would look like the following:
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</para>
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<programlisting>add feature: DriveLink={ Name="DL }, /dev/evms/vol</programlisting>
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</sect2>
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</sect1>
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</chapter>
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