On Saturday 03 May 2014 20:40:47 J. Roeleveld wrote: > On Saturday, May 03, 2014 06:09:21 PM Peter Humphrey wrote: > > Hope I'm not butting in here, but... > > > > Although I don't run systemd nor do I have an initramfs, the grub.conf > > entry for my LVM2 setup is just these two lines: > > > > title=Gentoo Linux 3.12.13 > > kernel /boot/kernel-x86_64-3.12.13-gentoo root=/dev/md5 > > net.ifnames=0 > > That works with metadata=0.9 when creating the raid-1 device and not having > " / " on LVM.
Yes, I should have added that I have /boot on straight ext2 on /dev/sda1 (sdb1 is ready in case I decide to raid it). The file-system root is on raid1 and everything else is in LVs on /dev/md7, also raid1. I did it that way to keep booting simple. And I've used 0.9 metadata throughout. > I only have /boot on a raid-1 with metadata=0.9. > All the other partitions are LVs with the lvm layer ontop of a raid-0. > (no important data is stored locally on the desktop machines) I wanted the little extra safety of raid1 because this is where I keep all my data. > > I've noticed several times (often much to my annoyance before I discovered > > what to do about it*) that starting of the raid arrays is automatic, > > apparently done by the kernel though I could be wrong about that. In fact > > I was astonished to find not long ago that I'd been running for a year or > > two with neither lvm2 nor mdraid installed! > > Something must have handled the LVM part. Afaik, there is no kernel auto- > detect for LVM. Yes, that's why I mentioned it. If it's not the kernel I don't know what else it could have been. Udev? I don't see anything relevant under /etc/udev. > > * SystemRescueCD and the Gentoo minimal installation CD both start any > > raid > > arrays they find and apply their own names to them. It is then impossible, > > or so I thought, to resume an interrupted installation process. Of course, > > all I had to do was "mdadm --stop /dev/md127" etc. > > Yes, I noticed that annoyance myself. I would much prefer it to default to > more logical names. If the docs had included that little snippet I'd have saved myself many a frustrating hour. I'll only look stupid if I tell you how many ;-) Anyway, I don't want to hijack the thread. I just wanted to point out that raid arrays don't need lvm2 or mdraid present to auto-start, at least not on my openrc box which also has no initramfs. -- Regards Peter
