Here is what I dit.
I've moved my root filesystemen (logical volume) to xfs and compiled a couple of kernels, il was a bit long, my machine is not so fast. The first one with xfs hard coded and the second with xfs as a module applying the recipe given by Ken: I have built the normal initrd with lvmcreate_initrd, then mounted/edited/copied it and have the following result:
With XFS hardcoded, everything went fine and the system is running fine.
With XFS as a module it isnot the case, even if the system load the modole at boot, I get a kernel panic. Here are the messages I wriiten down by hand ( :-O ):
/------------------ |... snipped .. | RAMDISK: Compressed image found at block 0 | Freeing initrd memory: 1532k freed | VFS: Mounter root (ext2 filesystem) | LVM version 1.0.8 (17/11/2003à module loaded | SGI XFS with no debug enabled <-- was happy ;-) | SGI: XFS Quota Management subsystem | vgscan -- reading all physical volumes (this may take a while) | vgscan -- found inactive volume group "v00" | vscan -- ERROR 28 writing volume group backup file | /etc/lvmtab.d/vg00.tmp in vg-cfgbackup.c [line 273] | vgscan -- ERROR: unable to do backup of volume group "vg003 | vgscan -- ERROR: "lvm_tab_vg_removed": ulink "removing volume group | "vg00" and "/etc/lvmtab.d" succesfully created | vgscan -- WARNING: This program doesnt do a VGA backup of your | volume group | vgchang -- no volume roup found | VFS. Cannot open root device "3a02" or 3a:02 | Please append a corret "root=" boot option |Kernel panic: VFS: Unable to mount root fs on 3a:02 \___________
End of story.
It seems to find and load my xfs module but then there is a vgscan problem. As it work fine with xfs hard coded, I don't really *need* it as a module but I would like to know where is the problem
-- Regards - Jean-Luc
Le 02.03.2004 18:19, Ken Fuchs a écrit :
To: linux-lvm@redhat.com In-reply-to: <20040302154631.GB12779@tykepenguin.com> (message from Patrick Caulfield on Tue, 2 Mar 2004 15:46:32 +0000) Subject: Re: Adding xfs module to the initrd-lvm BCC: kfuchs@unicycling.org References: <20040302152911.GI15556@tangerine.coulon.evette> <20040302154631.GB12779@tykepenguin.com> --text follows this line--On Tue, Mar 02, 2004 at 04:29:11PM +0100, Jean-Luc Coulon (f5ibh)wrote:
I would like to add the xfs module to the lvm created by lvmcreate_initrd.
Is there a mean to do that easily? So I have to mount and existing one and add the module by hand?
Patrick Caulfield wrote:
I suspect that's the easiest way if that's what you really need to do.
So I have to use the standard initrd tools?
You could edit the existing lvmcreate_initrd to add the module (look for lvm-mod and write some similar code underneath it).
But the easiest way, by far, is to have your kernel with XFS compiled into it rather than as a module!
An alternative is to simply modify the initrd manually (Very easy and rather straightforward):
Make a backup copy of the initrd.
(If the initrd is compressed, uncompress it using gunzip.)
# mount -o loop /boot/initrd-<version> /data1 # cp -p /lib/modules/<version>/kernel/fs/xfs/xfs.o /data1/lib/modules/<version>/kernel/fs/xfs/ <Destination directory can be anywhere as long as insmod arg in linuxrc matches.> # <edit> /data1/linuxrc <Add insmod command to insert module xfs.o.> /bin/insmod /lib/modules/<version>/kernel/fs/xfs/xfs.o # umount /data1
(If the initrd was compressed, compress it using gzip.)
# shutdown -r now
Rather than replace the original initrd, one could copy and modify it and make a new lilo or grub entry for the old kernel/modified initrd. This allows one to boot from the original kernel/initrd in case the modified initrd contains a mistake that prevents proper booting.
Sincerely,
Ken Fuchs <kfuchs@winternet.com>
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