LVM2 on dmraid -- can't boot
When building the new system installation from a liveCD, I can easily create an LVM2 filesystem on top of a dmraid (FakeRaid) 1 array, and the filesystem works great. However, when booting from a primary physical (non-LVM) partition on the dmraid array, only that partition seems to mount properly; When I try to mount any of the LVM partitions, all I see in them is "lost+found." Naturally, the boot process fails at that point.
http://article.gmane.org/gmane.linux.ataraid/1989
illustrates my situation.
The two details not mentioned there:
1. When mounting any partition (LVM or not), I get 'cramfs: wrong magic'
2. I see the following when I do dmraid -ay
[ 2881.836361] attempt to access beyond end of device
[ 2881.836406] sda: rw=0, want=9767777280, limit=876773168
[ 2881.836361] attempt to access beyond end of device
[ 2881.836406] sdb: rw=0, want=9767777280, limit=876773168Can anyone offer help?
Thanks!
Signature · 3 lines
Dave Abrahams Boost Consulting www.boost-consulting.com
Hello there David.
Several things to check.
First, do you have LVM2 support in the kernel at time of boot? Either by having modules which get carried in the initial RAM disk and then get loaded when the kernel first boots or by compiling them in.
Second, do you have DM-RAID support in the kernel at time of boot? Same note as above for how to get there.
Third, do you have someplace where the kernel and initial RAM disk live that is either on RAID-1 or not protected at all?
Fourth, which boot loader as you using? LILO can be fooled into handling getting the kernel and initial RAM disk from inside an LV, GRUB can not be fooled like that.
Fifth, since I assume this is Intel based, you still need the kernel and initial RAM disk to reside on the first section of the physical disks due to hardware boot logic issues (INT 13 things I think).
I have a number of systems running LVM2 on top of soft RAID, using LILO to boot. My system volumes have 2 paritions, one for "/boot" and then everything else. All filesystems reside on LVs, including swap and "/". So I know this will work.
Give me a shout back if you still having issues.
Thanks!
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of David Abrahams
Sent: Sunday, July 09, 2006 2:09 PM
To: [email protected]
Subject: [linux-lvm] LVM2 on dmraid -- can't boot
When building the new system installation from a liveCD, I can easily create an LVM2 filesystem on top of a dmraid (FakeRaid) 1 array, and the filesystem works great. However, when booting from a primary physical (non-LVM) partition on the dmraid array, only that partition seems to mount properly; When I try to mount any of the LVM partitions, all I see in them is "lost+found." Naturally, the boot process fails at that point.
http://article.gmane.org/gmane.linux.ataraid/1989
illustrates my situation.
The two details not mentioned there:
1. When mounting any partition (LVM or not), I get 'cramfs: wrong magic'
2. I see the following when I do dmraid -ay
[ 2881.836361] attempt to access beyond end of device
[ 2881.836406] sda: rw=0, want=9767777280, limit=876773168
[ 2881.836361] attempt to access beyond end of device
[ 2881.836406] sdb: rw=0, want=9767777280, limit=876773168Can anyone offer help?
Thanks!
Signature · 9 lines
Dave Abrahams Boost Consulting www.boost-consulting.com _______________________________________________ linux-lvm mailing list [email protected] https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/