[Bug 985741] Re: multipath can't show device on which is setup lvm

[David Duffey]

Hi Vencent,

The initial ramdisk includes modules, configuration files, and scripts needed to boot
the system.  Since everything works post-boot, I suspect that some initialization
is the problem.

After looking through your information I am almost certain this is because during
the init process LVM is grabbing the block devices BEFORE multipath gets the chance.

Do you see that after the boot your volume groups are using scsi major numbers (8)
instead of multipath (252)?

It doesn't explain everything.. I would expect this to be a problem even for the
second partition, not only when you create an LVM on partition 1.  Nor does it
explain why the volume group doesn't come up, yet it found it's PVs (directly
instead of using the correct multipath).

Take a look at this bug report, it is a familiar problem. You might have to recreate
an initrd with the correct multipath and lvm config files, and also make sure the
kernel modules you need are loaded.

https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/246324

Sorry I do not have 11.10 installed or I would try to dig a bit deeper.  Canonical
does have a Technical Partner Program for vendors that want to have a formal
relationship (technical partner manager) to make their devices work well
out-of-the-box with Ubuntu.

David

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Title:
  multipath can't show device on which is setup lvm

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