On Sun, Nov 04, 2012 at 05:07:59PM +0100, Thomas Bächler wrote: > Am 03.11.2012 02:40, schrieb Eric Bélanger: > > If you use both RAID and LVM, make sure that you use the mdadm_udev > > hook instead of the mdadm one. I had to do this change to make my > > system boot with the lvm2 package in [testing]. > > Okay, we figured this out by now: > > The 'mdadm' hook does not only disable the auto-assembly, it lacks any > udev rules in initramfs - this means that udev will not know about file > system type on the RAID contents and LVM auto-assembly fails.
I guess I knew this, as it caused problems in the past when we created mdadm_udev: https://bugs.archlinux.org/task/28067 > The solution would be to include the udev rules in the mdadm hook as > well, and just disable auto-assembly. This was always the sticking point -- is there a way to disable auto assembly but keep the rule file as is? I'd rather we didn't duplicate it. > On another note: The mdadm_udev behaviour used to be the default for a > while, but we had a lot of whining about it - none of the affected > people had any interest in figuring out why auto-assembly failed for > them. I'd really like to get rid of the non-udev based mdadm assembly, > so if anyone has an idea why there were problems, feel free to share. > > While we're at it, I'd like to fix mdadm's udev rule to use > BUILTIN+="blkid" instead of manually calling blkid. This is definitely needed. I think the -o udev output from blkid is going away in u-l 2.23. The blkid builtin is already almost a year old -- would make more sense to just convince upstream to make the change. d
