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>Chapter 10. Transitioning from previous versions of LVM to LVM 1.0.8</TD
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>10.2. Upgrading to LVM 1.0.8 with an LVM root partition and initrd</H1
><P
> This is relatively straightforward if you follow the steps
carefully. It is recommended you have a good backup and a suitable
rescue disk handy just in case.
</P
><P
> The <SPAN
CLASS="QUOTE"
>"normal"</SPAN
> way of running an LVM root file system is
to have a single non-LVM partition called
<TT
CLASS="filename"
>/boot</TT
>
which contains the kernel and initial RAM disk needed to start the
system. The system I upgraded was as follows:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
> # df</B
>
<TT
CLASS="computeroutput"
> Filesystem 1k-blocks Used Available Use% Mounted on
/dev/rootvg/root 253871 93384 147380 39% /
/dev/hda1 17534 12944 3685 78% /boot
/dev/rootvg/home 4128448 4568 3914168 0% /home
/dev/rootvg/usr 1032088 332716 646944 34% /usr
/dev/rootvg/var 253871 31760 209004 13% /var
</TT
>
</PRE
></FONT
></TD
></TR
></TABLE
>
<TT
CLASS="filename"
>/boot</TT
>
contains the old kernel and an initial RAM disk as well as the LILO
boot files and the following entry in
<TT
CLASS="filename"
>/etc/lilo.conf</TT
>
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
> # ls /boot</B
>
<TT
CLASS="computeroutput"
> System.map lost+found vmlinux-2.2.16lvm
map module-info boot.0300
boot.b os2_d.b chain.b
initrd.gz
</TT
>
<B
CLASS="command"
> # tail /etc/lilo.conf</B
>
<TT
CLASS="computeroutput"
> image=/boot/vmlinux-2.2.16lvm
label=lvm08
read-only
root=/dev/rootvg/root
initrd=/boot/initrd.gz
append="ramdisk_size=8192"
</TT
>
</PRE
></FONT
></TD
></TR
></TABLE
>
<P
></P
><OL
TYPE="1"
><LI
><P
> <STRONG
> Build LVM kernel and modules
</STRONG
>
</P
><P
> Follow the steps outlined in
<A
HREF="getlvm.html"
>Chapter 5</A
> - <A
HREF="buildlvmmod.html"
>Section 6.2</A
>
for instructions on how to get and build the necessary
kernel components of LVM.
</P
></LI
><LI
><P
> <STRONG
> Build the LVM user tools
</STRONG
>
</P
><P
> Follow the steps in
<A
HREF="buildlvmmod.html"
>Section 6.2</A
> to build and install the user
tools for LVM.
</P
><P
> Install the new tools. Once you have done this you cannot
do any LVM manipulation as they are not compatible with
the kernel you are currently running.
</P
></LI
><LI
><P
> <STRONG
> Rename the existing initrd.gz
</STRONG
>
</P
><P
> This is so it doesn't get overwritten by the new one
<TABLE
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BGCOLOR="#E0E0E0"
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><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
># mv /boot/initrd.gz /boot/initrd08.gz</B
>
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></LI
><LI
><P
> <STRONG
> Edit <TT
CLASS="filename"
>/etc/lilo.conf</TT
>
</STRONG
>
</P
><P
> Make the existing boot entry point to the renamed file.
You will need to reboot using this if something goes wrong
in the next reboot. The changed entry will look something
like this:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> image=/boot/vmlinux-2.2.16lvm
label=lvm08
read-only
root=/dev/rootvg/root
initrd=/boot/initrd08.gz
append="ramdisk_size=8192"
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></LI
><LI
><P
> <STRONG
> Run lvmcreate_initrd to create a new initial RAM disk
</STRONG
>
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
># lvmcreate_initrd 2.4.9</B
>
</PRE
></FONT
></TD
></TR
></TABLE
>
Don't forget the put the new kernel version in there so
that it picks up the correct modules.
</P
></LI
><LI
><P
> <STRONG
> Add a new entry into /etc/lilo.conf
</STRONG
>
</P
><P
> This new entry is to boot the new kernel with its new
initrd.
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> image=/boot/vmlinux-2.4.9lvm
label=lvm10
read-only
root=/dev/rootvg/root
initrd=/boot/initrd.gz
append="ramdisk_size=8192"
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></LI
><LI
><P
> <STRONG
> Re-run lilo
</STRONG
>
</P
><P
> This will install the new boot block
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
># /sbin/lilo</B
>
</PRE
></FONT
></TD
></TR
></TABLE
>
</P
></LI
><LI
><P
> <STRONG
> Reboot
</STRONG
>
</P
><P
> When you get the LILO prompt select the new entry name (in
this example lvm10) and your system should boot into Linux
using the new LVM version.
</P
><P
> If the new kernel does not boot, then simply boot the old
one and try to fix the problem. It may be that the new
kernel does not have all the correct device drivers built
into it, or that they are not available in the initrd.
Remember that all device drivers (apart from LVM) needed
to access the root device should be compiled into the
kernel and not as modules.
</P
><P
> If you need to do any LVM manipulation when booted back
into the old version, then simply recompile the old tools
and install them with
<TABLE
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WIDTH="100%"
><TR
><TD
><FONT
COLOR="#000000"
><PRE
CLASS="screen"
> <B
CLASS="command"
># make install</B
>
</PRE
></FONT
></TD
></TR
></TABLE
>
If you do this, don't forget to install the new tools when
you reboot into the new LVM version.
</P
></LI
></OL
>
When you are happy with the new system remember to change the
``default='' entry in your lilo.conf file so that it is the default
kernel.
</P
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