452 lines
6.9 KiB
HTML
452 lines
6.9 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Moving a volume group to another system</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="LVM HOWTO"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Recipes"
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HREF="recipes.html"><LINK
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REL="PREVIOUS"
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TITLE="Removing an Old Disk"
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HREF="removeadisk.html"><LINK
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REL="NEXT"
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TITLE="Splitting a volume group"
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HREF="recipesplitvg.html"></HEAD
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>LVM HOWTO</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="removeadisk.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 13. Recipes</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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>Next</A
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="recipemovevgtonewsys"
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></A
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>13.6. Moving a volume group to another system</H1
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><P
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> It is quite easy to move a whole volume group to another system if,
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for example, a user department acquires a new server. To do this we
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use the vgexport and vgimport commands.
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</P
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><DIV
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CLASS="note"
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><P
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></P
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><TABLE
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CLASS="note"
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WIDTH="100%"
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BORDER="0"
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><TR
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><TD
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WIDTH="25"
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ALIGN="CENTER"
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VALIGN="TOP"
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><IMG
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SRC="../images/note.gif"
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HSPACE="5"
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ALT="Note"></TD
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><TD
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ALIGN="LEFT"
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VALIGN="TOP"
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><P
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> vgexport/vgimport is not necessary to move drives
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from one system to another. It is an administrative policy
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tool to prevent access to volumes in the time it takes to
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move them.
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</P
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></TD
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></TR
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></TABLE
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1325"
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></A
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>13.6.1. Unmount the file system</H2
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><P
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> First, make sure that no users are accessing files on the active
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volume, then unmount it
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># unmount /mnt/design/users</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1330"
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></A
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>13.6.2. Mark the volume group inactive</H2
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><P
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> Marking the volume group inactive removes it from the kernel and
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prevents any further activity on it.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># vgchange -an design</B
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>
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<TT
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CLASS="computeroutput"
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>vgchange -- volume group "design" successfully deactivated</TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1336"
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></A
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>13.6.3. Export the volume group</H2
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><P
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> It is now necessary to export the volume group. This prevents it
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from being accessed on the ``old'' host system and prepares it
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to be removed.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># vgexport design</B
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>
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<TT
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CLASS="computeroutput"
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>vgexport -- volume group "design" successfully exported</TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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When the machine is next shut down, the disk can be unplugged
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and then connected to it's new machine
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1342"
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></A
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>13.6.4. Import the volume group</H2
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><P
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> When plugged into the new system it becomes /dev/sdb so an
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initial pvscan shows:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># pvscan</B
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>
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<TT
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CLASS="computeroutput"
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>pvscan -- reading all physical volumes (this may take a while...)
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pvscan -- inactive PV "/dev/sdb1" is in EXPORTED VG "design" [996 MB / 996 MB free]
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pvscan -- inactive PV "/dev/sdb2" is in EXPORTED VG "design" [996 MB / 244 MB free]
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pvscan -- total: 2 [1.95 GB] / in use: 2 [1.95 GB] / in no VG: 0 [0]</TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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We can now import the volume group (which also activates it) and
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mount the file system.
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</P
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><P
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> If you are importing on an LVM 2 system, run:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># vgimport design</B
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>
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<TT
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CLASS="computeroutput"
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> Volume group "vg" successfully imported</TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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><P
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> If you are importing on an LVM 1 system, add the PVs that need to be imported:
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># vgimport design /dev/sdb1 /dev/sdb2</B
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>
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<TT
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CLASS="computeroutput"
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>vgimport -- doing automatic backup of volume group "design"
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vgimport -- volume group "design" successfully imported and activated</TT
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1356"
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></A
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>13.6.5. Activate the volume group</H2
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><P
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> You must activate the volume group before you can access it.
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<TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># vgchange -ay design</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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</P
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></DIV
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><DIV
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CLASS="sect2"
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><H2
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CLASS="sect2"
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><A
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NAME="AEN1361"
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></A
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>13.6.6. Mount the file system</H2
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><P
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> <TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <B
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CLASS="command"
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># mkdir -p /mnt/design/users
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# mount /dev/design/users /mnt/design/users</B
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>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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>
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The file system is now available for use.
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</P
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>Removing an Old Disk</TD
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VALIGN="top"
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>Splitting a volume group</TD
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