Ok, so Oleg and I were looking at a solution, and figured we'd give the "maybe it just works" path a try. I installed a system, it installed onto /dev/sda (as this bug shows). I then 'apt-get install multipath-tools-boot'
I rebooted, with the 'root=LABEL=cloudimg-rootfs' on the cmdline (as normal). It died in initramfs unable to find root. The full bootlog at http://paste.ubuntu.com/11547135/ . The multipath-tools-boot package puts some code into the initramfs (/usr/share/initramfs-tools/scripts/local-top/multipath) that does this: | if [ -x /sbin/kpartx -a -x /sbin/dmsetup ]; then | /sbin/dmsetup ls --target multipath --exec "/sbin/kpartx -a -p -part" >/dev/null | fi That looks all well and good. In the initramfs I did some debugging: (initramfs) /sbin/dmsetup ls --target multipath 1IBM IPR-0 5EC2A900000000A0 (252, 1) 1IBM IPR-0 5EC2A90000000020 (252, 2) 1IBM IPR-0 5EC2A90000000080 (252, 5) 1IBM IPR-0 5EC2A90000000060 (252, 3) 1IBM IPR-0 5EC2A900000000C0 (252, 4) 1IBM IPR-0 5EC2A90000000040 (252, 0) And then further debug, I find that dmsetup is calling kpartx seemingly correctly, but kpartx is I think messing up. I was able to fix this by booting with: root=UUID=f7c3b31d-3411-420e-a57d-9318e43248ba ro console=hvc0 break=post-multipath Then doing: (initramfs) cat /tmp/myprog #!/bin/sh tgt="$1" fixed=$(echo "$tgt" | sed 's, ,\\x20,g') { echo "input: '$tgt'" echo "fixed: '$fixed'" echo /sbin/kpartx -a -v -p -part "$fixed" /sbin/kpartx -a -v -p -part "$fixed" ret=$? echo $ret } >> /tmp/log 2>&1 exit $ret (initramfs) rm /tmp/log (initramfs) /sbin/dmsetup ls --target multipath --exec "/bin/myprog" (initramfs) cat /tmp/log input: '/dev/mapper/1IBM IPR-0 5EC2A900000000A0' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A900000000A0' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A900000000A0 0 input: '/dev/mapper/1IBM IPR-0 5EC2A90000000020' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000020' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000020 0 input: '/dev/mapper/1IBM IPR-0 5EC2A90000000080' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000080' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000080 add map 1IBM IPR-0 5EC2A90000000080-part1 (252:6): 0 16384 linear /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000080 2048 add map 1IBM IPR-0 5EC2A90000000080-part2 (252:7): 0 554268639 linear /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000080 18432 0 input: '/dev/mapper/1IBM IPR-0 5EC2A90000000060' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000060' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000060 0 input: '/dev/mapper/1IBM IPR-0 5EC2A900000000C0' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A900000000C0' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A900000000C0 0 input: '/dev/mapper/1IBM IPR-0 5EC2A90000000040' fixed: '/dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000040' /sbin/kpartx -a -v -p -part /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000040 Then ... after that, I have the devices I needed: (initramfs) blkid /dev/sda2: LABEL="cloudimg-rootfs" UUID="f7c3b31d-3411-420e-a57d-9318e43248ba" TYPE="ext4" /dev/sdg2: LABEL="cloudimg-rootfs" UUID="f7c3b31d-3411-420e-a57d-9318e43248ba" TYPE="ext4" /dev/mapper/1IBM\x20\x20\x20\x20\x20IPR-0\x20\x20\x205EC2A90000000080-part2: LABEL="cloudimg-rootfs" UUID="f7c3b31d-3411-420e-a57d-9318e43248ba" TYPE="ext4" I exited from there, the remaining boot took over, and mounted the device mapper device as /. All happy. So, if there weren't a bug in kpartx we'd have a very easy solution in just installing the multipath-tools-boot package. That said, it looks like user_friendly_names in /etc/multipath.conf might be relevant. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1371634 Title: block devices appear twice To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/curtin/+bug/1371634/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
