<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML ><HEAD ><TITLE >Reducing a logical volume</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="Common Tasks" HREF="commontask.html"><LINK REL="PREVIOUS" TITLE="Extending a logical volume" HREF="extendlv.html"><LINK REL="NEXT" TITLE="Migrating data off of a physical volume" HREF="migrateoffpv.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="extendlv.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 11. Common Tasks</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="migrateoffpv.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="reducelv" ></A >11.10. Reducing a logical volume</H1 ><P > Logical volumes can be reduced in size as well as increased. However, it is <EM >very</EM > important to remember to reduce the size of the file system or whatever is residing in the volume before shrinking the volume itself, otherwise you risk losing data. </P ><P ></P ><OL TYPE="1" ><LI ><P > <STRONG > ext2 </STRONG > </P ><P > If you are using LVM 1 with ext2 as the file system then you can use the e2fsadm command mentioned earlier to take care of both the file system and volume resizing as follows: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="screen" > <B CLASS="command" ># umount /home # e2fsadm -L-1G /dev/myvg/homevol # mount /home</B > </PRE ></FONT ></TD ></TR ></TABLE > <DIV CLASS="warning" ><P ></P ><TABLE CLASS="warning" WIDTH="100%" BORDER="0" ><TR ><TD WIDTH="25" ALIGN="CENTER" VALIGN="TOP" ><IMG SRC="../images/warning.gif" HSPACE="5" ALT="Warning"></TD ><TH ALIGN="LEFT" VALIGN="CENTER" ><B >LVM 2 Caveat</B ></TH ></TR ><TR ><TD > </TD ><TD ALIGN="LEFT" VALIGN="TOP" ><P > There is currently no e2fsadm equivalent for LVM 2 and the e2fsadm that ships with LVM 1 does not work with LVM 2. </P ></TD ></TR ></TABLE ></DIV > </P ><P > If you prefer to do this manually you must know the new size of the volume in blocks and use the following commands: <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="screen" > <B CLASS="command" ># umount /home # resize2fs /dev/myvg/homevol 524288 # lvreduce -L-1G /dev/myvg/homevol # mount /home</B > </PRE ></FONT ></TD ></TR ></TABLE > </P ></LI ><LI ><P > <STRONG > reiserfs </STRONG > </P ><P > Reiserfs seems to prefer to be unmounted when shrinking <TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><FONT COLOR="#000000" ><PRE CLASS="screen" > <B CLASS="command" ># umount /home # resize_reiserfs -s-1G /dev/myvg/homevol # lvreduce -L-1G /dev/myvg/homevol # mount -treiserfs /dev/myvg/homevol /home</B > </PRE ></FONT ></TD ></TR ></TABLE > </P ></LI ><LI ><P > <STRONG > xfs </STRONG > </P ><P > There is no way to shrink XFS file systems. </P ></LI ><LI ><P > <STRONG > jfs </STRONG > </P ><P > There is no way to shrink JFS file systems. </P ></LI ></OL ></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="extendlv.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="migrateoffpv.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Extending a logical volume</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="commontask.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Migrating data off of a physical volume</TD ></TR ></TABLE ></DIV ></BODY ></HTML >