<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Building the device-mapper module</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="LVM HOWTO" HREF="index.html"><LINK REL="UP" TITLE="Building the kernel modules" HREF="buildkernelmods.html"><LINK REL="PREVIOUS" TITLE="Building the kernel modules" HREF="buildkernelmods.html"><LINK REL="NEXT" TITLE="Build the LVM 1 kernel module" HREF="buildlvmmod.html"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >LVM HOWTO</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="buildkernelmods.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 6. Building the kernel modules</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="buildlvmmod.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="builddmmod" ></A >6.1. Building the device-mapper module</H1 ><P > Device mapper is in 2.6.9 and later, so you just need to make sure it is enabled either as a module or builtin to the kernel. Look for /sys/class/misc/device-mapper or look in /proc/devices for a device-mapper entry to see if it is enabled. If neither are there, try modprobe dm_mod, then check again. For versions previous to 2.6.9, either you or your distro must patch the kernel to support it. Check the <A HREF="http://sources.redhat.com/dm/" TARGET="_top" >device mapper</A > web page for more information. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="buildkernelmods.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="buildlvmmod.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Building the kernel modules</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="buildkernelmods.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Build the LVM 1 kernel module</TD ></TR ></TABLE ></DIV ></BODY ></HTML >