[Bug 1432062] Re: multipath-tools-boot: support booting without user_friendly_names on devices with spaces in identifiers

[Mauricio Faria de Oliveira]

Marking as verification-done.

Details:
-------

qemu-kvm guest w/ rootfs on multipath

	# mount | grep ' / '
	/dev/mapper/mauricfo4--vg-root on / type ext4 (rw,errors=remount-ro)

	# lvm pvdisplay | grep Name
	  PV Name               /dev/mapper/mpath0-part3
	  VG Name               mauricfo4-vg

the disk WWID contains spaces

	# multipath -l
	mpath0 (0QEMU    QEMU HARDDISK   trustyroot) dm-0 QEMU    ,QEMU HARDDISK   
	size=32G features='0' hwhandler='0' wp=rw
	|-+- policy='round-robin 0' prio=-1 status=active
	| `- 0:0:0:0 sda 8:0  active undef running
	`-+- policy='round-robin 0' prio=-1 status=enabled
	  `- 0:0:1:0 sdb 8:16 active undef running

install new version

        # apt-get install multipath-tools-boot=0.4.9-3ubuntu7.8

	# dpkg -s kpartx | grep Version
	Version: 0.4.9-3ubuntu7.8

remove multipath configuration (user_friendly_names, bindings, wwids)
from rootfs and initramfs

        # rm -rf /etc/multipath*

	# mount /boot
	# update-initramfs -u
	update-initramfs: Generating /boot/initrd.img-4.2.0-27-generic

verify

	# reboot
	...
	Loading, please wait...
	[    0.482143] systemd-udevd[92]: starting version 204
	Begin: Loading essential drivers ... done.
	Begin: Running /scripts/init-premount ... done.
	Begin: Mounting root file system ... Begin: Running /scripts/local-top ... Begin: Loading multipath modules ... 
	[    0.546011] device-mapper: multipath: version 1.9.0 loaded
	Success: loaded module dm-multipath.
	Failure: failed to load module dm-emc.
	done.
	Begin: Starting multipathd ... [    0.558504] multipathd (125): /proc/125/oom_adj is deprecated, please use /proc/125/oom_score_adj instead.
	[    0.571510] device-mapper: multipath round-robin: version 1.0.0 loaded
	[    0.661820] random: lvm urandom read with 60 bits of entropy available
	[    0.910243] random: nonblocking pool is initialized
	done.
	Begin: Running /scripts/local-premount ... Begin: Waiting for udev to settle (multipath) ... done.
	done.
	[    1.122520] EXT4-fs (dm-4): mounted filesystem with ordered data mode. Opts: (null)
	Begin: Running /scripts/local-bottom ... Begin: Stopping multipathd ... done.
	done.
	done.
	Begin: Running /scripts/init-bottom ... done.
	[    1.211793] init: plymouth-upstart-bridge main process (339) terminated with status 1
	[    1.211889] init: plymouth-upstart-bridge main process ended, respawning
	[    1.230100] init: plymouth-upstart-bridge main process (350) terminated with status 1
	[    1.230199] init: plymouth-upstart-bridge main process ended, respawning
	[    1.415024] Adding 1417152k swap on /dev/mapper/mauricfo4--vg-swap_1.  Priority:-1 extents:1 across:1417152k FS
	[    1.417519] EXT4-fs (dm-4): re-mounted. Opts: errors=remount-ro

Great, the rootfs is found and mounted.

Notice this setup (LVM on multipath) hits LP #1540401, 
but non-LVM on multipath doesn't, as originally reported.

	The disk drive for /boot is not ready yet or not present.
	keys:Continue to wait, or Press S to skip mounting or M for manual recovery

        keys: S

And the system boots successfully:

	# mount | grep ' / '
	/dev/mapper/mauricfo4--vg-root on / type ext4 (rw,errors=remount-ro)

	# pvdisplay | grep Name
	  PV Name               /dev/HARDDISK
	  VG Name               mauricfo4-vg

	# multipath -l
	0QEMU    QEMU HARDDISK   trustyroot dm-0 QEMU    ,QEMU HARDDISK   
	size=32G features='0' hwhandler='0' wp=rw
	|-+- policy='round-robin 0' prio=-1 status=active
	| `- 0:0:0:0 sda 8:0  active undef running
	`-+- policy='round-robin 0' prio=-1 status=enabled
	  `- 0:0:1:0 sdb 8:16 active undef running

Notice the LVM PV senses the multiple symlinks problem
(due to the spaces in the WWIDs) but this can be fixed 
(if desired) on a later update,
and does not occur w/ user_friendly_names.

The system *is* bootable, and the device-mapper table is correct
(LVM stacked on multipath devices):

	root at mauricfo4:~# dmsetup table | sort
	0QEMU    QEMU HARDDISK   trustyroot: 0 67108864 multipath 0 0 2 1 round-robin 0 1 1 8:0 1000 round-robin 0 1 1 8:16 1000 
	0QEMU    QEMU HARDDISK   trustyroot-part1: 0 14336 linear 252:0 2048
	0QEMU    QEMU HARDDISK   trustyroot-part2: 0 499712 linear 252:0 16384
	0QEMU    QEMU HARDDISK   trustyroot-part3: 0 66590720 linear 252:0 516096
	mauricfo4--vg-root: 0 63750144 linear 252:3 2048
	mauricfo4--vg-swap_1: 0 2834432 linear 252:3 63752192

The boot problem is fixed.
Marking as verification-done.

** Tags removed: verification-needed
** Tags added: verification-done

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to multipath-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1432062

Title:
  multipath-tools-boot: support booting without user_friendly_names on
  devices with spaces in identifiers

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1432062/+subscriptions