mirror of https://github.com/tLDP/LDP
163 lines
4.1 KiB
XML
163 lines
4.1 KiB
XML
<chapter id="segstorobjs"><title>Moving segment storage objects</title>
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<para>This chapter discusses how and why to move segments.
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</para>
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<sect1 id="segmovewhatis"><title>What is segment moving?</title>
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<para>A segment move is when a data segment is relocated to another
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location on the underlying storage object. The new location of
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the segment cannot overlap with the current segment location.
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</para>
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</sect1>
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<sect1 id="whymove"><title>Why move a segment?</title>
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<para>
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Segments are moved for a variety of reasons. The most compelling among
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them is to make better use of disk freespace. Disk freespace is an unused
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contiguous extent of sectors on a disk that has been identified by EVMS
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as a freespace segment. A data segment can only be expanded by adding
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sectors to the end of the segment, moving the end of the data segment
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up into the freespace that immediately follows the data segment. However,
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what if there is no freespace following the data segment? A segment or
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segments could
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be moved around to put freespace after the segment that is to be
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expanded. For example:
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</para>
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<itemizedlist>
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<listitem>
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<para>The segment following the segment to be expanded can be moved
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elsewhere on the disk, thus freeing up space after the segment that
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is to be expanded.</para>
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</listitem>
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<listitem>
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<para>The segment to be expanded can be moved into freespace where
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there is more room for the segment to be expanded.
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</para>
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</listitem>
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<listitem>
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<para>The segment can be moved into freespace that precedes the
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segment so that after the move the data segment can be expanded into the freespace
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created by the move.</para>
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</listitem>
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</itemizedlist>
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</sect1>
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<sect1><title>Which segment manager plug-ins implement the move function?</title>
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<para>The following segment manager plug-ins support the move function:
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</para>
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<itemizedlist>
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<listitem>
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<para>
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DOS
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</para>
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</listitem>
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<listitem>
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<para>
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s390
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</para>
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</listitem>
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<listitem>
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<para>
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GPT
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</para>
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</listitem>
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</itemizedlist>
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</sect1>
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<sect1 id="movesegex"><title>Example: move a DOS segment</title>
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<para> This section shows how to move a DOS segment:</para>
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<note><title>Note</title>
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<para>
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In the following example, the DOS segment manager has a single
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primary partition on disk sda that is located at the very end of the disk.
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We want to move it to the front of the drive because we want to expand
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the segment but there is currently no freespace following the segment.
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</para>
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</note>
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<sect2 id="guimoveseg"><title>Using the EVMS GUI context sensitive menu</title>
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<para>To move the DOS segment through the GUI context sensitive menu,
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follow these steps:</para>
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<orderedlist>
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<listitem><para>From the <guimenuitem>Segments</guimenuitem>
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tab, right click
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<filename>sda1</filename>.
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</para></listitem>
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<listitem>
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<para>Click <guibutton>Move</guibutton>.</para>
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</listitem>
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<listitem><para>Select <filename>sda_freespace1</filename>.
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</para>
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</listitem>
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<listitem><para>Click <guibutton>Move</guibutton>.</para>
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</listitem>
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</orderedlist>
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</sect2>
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<!-- Ncurses-->
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<sect2 id="ncursmoveseg"><title>Using Ncurses</title>
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<para>To move the DOS segment, follow these steps:</para>
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<orderedlist>
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<listitem><para>Use <keycap>Tab</keycap>
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to select the Disk Segments view.
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</para>
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</listitem>
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<listitem><para>Scroll down with the down arrow and
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select <filename>sda1</filename>.</para>
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</listitem>
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<listitem><para>Press
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<keycap>Enter</keycap>.</para>
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</listitem>
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<listitem><para>Scroll down with the down arrow and
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select <guibutton>Move</guibutton> by pressing
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<keycap>Enter</keycap>.</para>
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</listitem>
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<listitem><para>Use the spacebar to select
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<filename>sda_freespace1</filename>.</para>
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</listitem>
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<listitem><para>Use <keycap>Tab</keycap>
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to select <guibutton>Move</guibutton> and press
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<keycap>Enter</keycap>.
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</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="clisegmove"><title>Using the CLI</title>
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<para>Use the
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<command>task</command> command to move a DOS segment with the CLI.
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</para>
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<programlisting>task:Move,sda1,sda_freespace1</programlisting>
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</sect2>
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</sect1>
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</chapter>
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