gentoo on lvm root

jessinio · n00b Joined: 04 Jan 2010 Posts: 3 Location: china

hi , all

before I had installed gentoo on ext3 file system and it work well.

Now, I try to install it on LVM (root file sytem) , but have trouble

My partitions is:

Device Boot Start End Blocks Id System
/dev/sda1 * 1 100 803218+ 83 Linux
/dev/sda2 101 30401 243392782+ 8e Linux LVM

* /dev/sda1 is my boot partition

and My LVM volumes list:
ACTIVE '/dev/sg250/ubuntu' [20.00 GB] inherit
ACTIVE '/dev/sg250/swap' [1.00 GB] inherit
ACTIVE '/dev/sg250/data' [100.00 GB] inherit
ACTIVE '/dev/sg250/gentoo' [20.00 GB] inherit

I had selected "Device mapper suppor" before compile kernel , but the kernel report can't mount root filesystem ERROR on boot

I search on web and find out: linux kernel need lvm module on boot when it mount LVM partition. this time, linux kernel need initrd.img file.

So, I read over the mkinitrd script code, and find out: My new system did NOT have dm-mod ! Look mkinitrd script code slice:

if [ -x /sbin/dmsetup -a -e /dev/mapper/control ]; then
dmout=$(/sbin/dmsetup ls 2>/dev/null)
if [ "$dmout" != "No devices found" -a "$dmout" != "" ]; then
findmodule -dm-mod
fi
fi

I CAN'T find "-dm-mod" ON MY disk:

# find /lib/modules -name "*dm-mod*"

I NEED YOUR HELP!

how to get the dm-mod module or compile it ?

MY kernel verion is 2.6.32.2

thanks!

jessinio AT gmail DOT com
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Good programmer know how to write his want,
Great programmer know how to rewrite his want.

cach0rr0 · Posted: Mon Apr 26, 2010 8:37 pm Post subject:

you probably have dm-mod as a built-in, rather than a module

can you dump your kernel .config up on pastebin so we can have a look?
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jessinio · n00b Joined: 04 Jan 2010 Posts: 3 Location: china

cach0rr0 · Posted: Tue Apr 27, 2010 10:22 am Post subject:

jessinio · n00b Joined: 04 Jan 2010 Posts: 3 Location: china

thanks YOUR replay, My .config file context:

http://pastebin.com/PbLAyZNj
_________________
Good programmer know how to write his want,
Great programmer know how to rewrite his want.

Rexilion · Veteran Joined: 17 Mar 2009 Posts: 1044

Perhaps you can try rebuilding your initrd? Do you have /sbin/dmsetup available?

Perhaps you could also post any error messages/symptoms if possible?