[Bug 985741] Re: multipath can't show device on which is setup lvm
vincent
vincent.y.chen at emc.com
Sat Apr 28 05:26:26 UTC 2012
Yes, Peter, you are right.
After I update initramfs, this issue is resolved.
Thanks for your strong support.
Vincent Chen
EMC2 | E-Lab Linux team
-----Original Message-----
From: bounces at canonical.com [mailto:bounces at canonical.com] On Behalf Of Peter Petrakis
Sent: Friday, April 27, 2012 9:54 PM
To: Chen, Vincent
Subject: [Bug 985741] Re: multipath can't show device on which is setup lvm
I don't think you need to upgrade at all, your multipathd is sufficiently modern
and not much different from the version in 12.04.
Interesting, I see that you're using user_friendly_names, though since you're also
using LVM, it kind of makes that feature redundant as the LVM is now your
user friendly name, and having that multipath feature adds another level of
complexity when UDEV is creating devices. Please set "user_friendly_names no" in
/etc/multipath.conf, and update your initrd "update-initramfs -k all -u". The last
part is important as the multipath.conf is copied to the initrd and used as the
basis for any blacklists or additional UDEV juggling.
What might have happened is you didn't update the initrd since you created the
initial multipath config. Since the default is no, the ramdisk creates the normal
long style WWID names, then it mounts root, multipathd starts which finds user
friendly names set and then begins destroying the original WWID names in
exchange for the mpathx versions. If LVM has claimed the MP device by then,
destruction of the original name (and dmtable entry) will be blocked by reference
counting.
In general, it's imperative that you update the initramfs whenever lvm.conf or
multipath.conf is changed, especially when you're using them together.
https://help.ubuntu.com/12.04/serverguide/multipath-devices.html
#multipath-devices-in-logical-volumes
Also, please adjust your local character encoding to a western font. Some of your text files
look like gibberish e.g.
https://launchpadlibrarian.net/103100334/test_before_after_lvm_reboot.txt
a¡±¡±a¡±€ (8:144)
mpath9 (252:7)
a¡±?a¡±€ (65:80)
a¡±¡±a¡±€ (8:160)
mpath15 (252:12)
a¡±?a¡±€ (8:224)
a¡±¡±a¡±€ (8:48)
mpath5-part1 (252:10)
a¡±¡±a¡±€mpath5 (252:2)
a¡±?a¡±€ (65:16)
a¡±¡±a¡±€ (8:96)
mpath14-part1 (252:9)
Thank you. -- Peter
** Changed in: multipath-tools (Ubuntu)
Status: Confirmed => Incomplete
** Changed in: multipath-tools (Ubuntu)
Assignee: (unassigned) => Peter Petrakis (peter-petrakis)
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https://bugs.launchpad.net/bugs/985741
Title:
multipath can't show device on which is setup lvm
Status in “multipath-tools” package in Ubuntu:
Incomplete
Bug description:
root at SGELLIN119:~# lsb_release -rd
Description: Ubuntu 11.10
Release: 11.10
affect package: multipath-tools, lvm2
If creating logical volume with Multipath on disk primary partition 1, multipath can’t find the
disks. Syslog show such error when booting system
kernel: [ 27.604034] device-mapper: table: 252:5: multipath: error getting device
kernel: [ 27.604115] device-mapper: ioctl: error adding target to table
I use fdisk to create two partitions on one physical lun.
Mpath6:
/dev/mapper/mpath6-part1
/dev/mapper/mpath6-part2
Mpath7:
/dev/mapper/mpath7-part1
/dev/mapper/mpath7-part2
create a logical volume on mpath6-part2, mpath7-part2
Reboot host, there is no exception and error logs. Multipath could
Find all devices.
root at SGELLIN119:~# multipath -ll | grep SYMM
mpath9 (360000970000192602316533030453335) dm-10 EMC,SYMMETRIX
mpath8 (360000970000192602316533030453334) dm-6 EMC,SYMMETRIX
mpath7 (360000970000192602316533030453333) dm-7 EMC,SYMMETRIX
mpath6 (360000970000192602316533030453332) dm-4 EMC,SYMMETRIX
mpath5 (360000970000192602316533030453331) dm-3 EMC,SYMMETRIX
root at SGELLIN119:~# lvs -v
Finding all logical volumes
LV VG #Seg Attr LSize Maj Min KMaj KMin Origin Snap% Move Copy% Log Convert LV UUID
mlv my_vg 1 -wi-a- 1020.00m -1 -1 252 22 c3cECW-CJry-OdXI-O9bZ-lXq8-BUYq-obzcvB
sym_lv2 sym_vg2 2 -wi-a- 200.00m -1 -1 252 20 1t9SZa-QEEm-2u6p-lCqN-aqcd-xOpn-dC1YAu
sym_lv3 sym_vg3 2 -wi-a- 200.00m -1 -1 252 21 w4H00r-l71s-UURm-C32C-wDuS-fEF2-wlJFI0
Then I use same way to create a lv on mpath6-part1 and mpath7-part1
After rebooting host, there are some error logs happen.
Multipath can’t find mpath6 and mapth7. Of course the logical volums on
Mpath6 and mpath7 were lost also.
root at SGELLIN119:~# multipath -ll| grep SYMM
mpath9 (360000970000192602316533030453335) dm-3 EMC,SYMMETRIX
mpath8 (360000970000192602316533030453334) dm-2 EMC,SYMMETRIX
mpath5 (360000970000192602316533030453331) dm-5 EMC,SYMMETRIX
root at SGELLIN119:~# lvs -v
Finding all logical volumes
LV VG #Seg Attr LSize Maj Min KMaj KMin Origin Snap% Move Copy% Log Convert LV UUID
mlv my_vg 1 -wi-a- 1020.00m -1 -1 252 1 c3cECW-CJry-OdXI-O9bZ-lXq8-BUYq-obzcvB
the finding is that if creating lvm on disk primary partition 1. Something were changed and it lead multipath
couldn’t find devices.
root at SGELLIN119:~# udevadm info --query=all --name=/dev/mapper/mpath6
P: /devices/virtual/block/dm-8
N: dm-8
L: -100
S: mapper/mpath6
S: disk/by-id/dm-name-mpath6
S: disk/by-id/dm-uuid-mpath-360000970000192602316533030453332
E: UDEV_LOG=3
E: DEVPATH=/devices/virtual/block/dm-8
E: MAJOR=252
E: MINOR=8
E: DEVNAME=/dev/dm-8
E: DEVTYPE=disk
E: SUBSYSTEM=block
E: DM_NAME=mpath6
E: DM_UUID=mpath-360000970000192602316533030453332
E: DM_SUSPENDED=0
E: DM_UDEV_RULES=1
E: DEVLINKS=/dev/mapper/mpath6 /dev/disk/by-id/dm-name-mpath6 /dev/disk/by-id/dm-uuid-mpath-360000970000192602316533030453332
Value "L" is negative compare to normal one
Here is an temporary recovery way:
4) Service multipath-tools stop
5) Dmsetup remove_all
6) Service multipath-tools start
However, the issue is consistent after I reboot OS.
If I remove lv ( still have LVM package in OS) , multipath work
well.
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Title:
multipath can't show device on which is setup lvm
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