mirror of https://github.com/tLDP/LDP
97 lines
3.7 KiB
XML
97 lines
3.7 KiB
XML
<chapter id="evmsreplaceobjects"><title>Replacing objects</title>
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<para>This chapter discusses how to replace objects.</para>
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<sect1 id="whatisobjectreplace"><title>What is object-replace?</title>
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<para>Occasionally, you might wish to change the configuration of a volume or
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storage object. For instance, you might wish to replace one of the disks in a
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drive-link or RAID-0 object with a newer, faster disk. As another example, you
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might have an EVMS volume created from a simple disk segment, and want to
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switch that segment for a RAID-1 region to provide extra data redundancy.
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Object-replace accomplishes such tasks.</para>
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<para>
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Object-replace gives you the ability to swap one object for another object.
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The new object is added while the original object is still in place. The data is
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then copied from the original object to the new object. When this is complete,
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the original object is removed. This process can be performed while the volume is
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mounted and in use.
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</para>
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</sect1>
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<sect1 id="replacedlchildobj"><title>Replacing a drive-link child object</title>
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<para>For this example, we will start with a drive-link object named <filename>link1</filename>,
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which is composed of two disk segments named sda1 and sdb1. The goal is to replace
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sdb1 with another segment named sdc1.</para>
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<note><title>Note</title>
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<para>The drive-linking plug-in allows the target object (sdc1 in this
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example) to be the same size or larger than the source object.
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If the target is larger, the extra space will be unused. Other plug-ins
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have different restrictions and might require that both objects be the
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same size.
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</para>
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</note>
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<sect2 id="guiobjectreplace"><title>Using the EVMS GUI or Ncurses</title>
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<para>Follow these steps to replace sdb1 with sdc1:
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<orderedlist>
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<listitem><para>Select
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<menuchoice>
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<guimenu>Actions</guimenu>
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<guimenuitem>Replace.</guimenuitem>
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</menuchoice>
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</para></listitem>
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<listitem><para>In the "Replace Source Object" panel select
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<guimenuitem>sdb1</guimenuitem>.
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</para></listitem>
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<listitem><para>Activate <guibutton>Next</guibutton>.</para></listitem>
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<listitem><para>In the "Select Replace Target Object" panel, select
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<guimenuitem>sdc1</guimenuitem>. </para></listitem>
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<listitem><para>Activate <guibutton>Replace</guibutton>.</para></listitem>
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</orderedlist></para>
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<para>Alternatively, you can perform these same steps with the
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context sensitive menus:</para>
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<orderedlist>
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<listitem><para>From the "Disk Segments" panel, right click (or Press
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<keycap>Enter</keycap> on) the object
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<guimenuitem>sdb1</guimenuitem>.</para></listitem>
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<listitem><para>Choose <guimenuitem>Replace</guimenuitem> on the popup menu.</para></listitem>
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<listitem><para>In the "Select Replace Target Object" panel, select
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<guimenuitem>sdc1.</guimenuitem></para></listitem>
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<listitem><para>Activate <guibutton>Replace</guibutton>.</para></listitem>
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</orderedlist>
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<para>When you save changes, EVMS begins to copy the data from sdb1 to sdc1.
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The status bar at the bottom of the UI will reflect the percent-complete of the
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copy operation. The UI must remain open until the copy is finished. At that time,
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the object sdb1 will be moved to the "Available Objects" panel.</para>
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</sect2>
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<sect2 id="clireplace"><title>Using the CLI</title>
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<para>Use the <command>Replace</command> to replace objects with
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the CLI:</para>
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<programlisting>
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Replace:source_object_name, target_object_name
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</programlisting>
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<para>
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"source_object_name" is the name of the object you wish to replace with
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"target_object_name." In the following example, sdb1 is replaced with
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sdc1.
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</para>
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<programlisting>
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Replace:sdb1,sdc1
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</programlisting>
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</sect2>
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</sect1>
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</chapter>
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