[Bug 1486370] [NEW] ISST-LTE: not all mpath device files are symbol link

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== Comment: #0 - Ping Tian Han <pthan at cn.ibm.com> - 2015-07-21 23:38:48 ==
---Problem Description---
Some mpath devices in /dev/mapper are symbol links to /dev/dm-<n>, but there are exceptions:

% ls -l /dev/mapper 
total 0
crw------- 1 root root  10, 236 Jul 21 20:46 control
lrwxrwxrwx 1 root root        7 Jul 21 20:46 mpath0 -> ../dm-0
brw------- 1 root root 252,   4 Jul 21 20:46 mpath0-part1
brw------- 1 root root 252,   6 Jul 21 20:46 mpath0-part2
brw------- 1 root root 252,   7 Jul 21 20:46 mpath0-part3
lrwxrwxrwx 1 root root        7 Jul 21 20:46 mpath1 -> ../dm-1
brw-rw---- 1 root disk 252,   2 Jul 21 20:46 mpath2
lrwxrwxrwx 1 root root        7 Jul 21 20:46 mpath3 -> ../dm-3
lrwxrwxrwx 1 root root        7 Jul 21 20:46 mpath4 -> ../dm-5

mpath2 isn't a symbol link.

% sudo dmestup info mpath2
sudo: dmestup: command not found
% sudo dmsetup info mpath2
Name:              mpath2
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      4
Major, minor:      252, 2
Number of targets: 1
UUID: mpath-36005076304ffc69f0000000000000469

% sudo dmsetup info /dev/dm-2 
Name:              mpath2
State:             ACTIVE
Read Ahead:        256
Tables present:    LIVE
Open count:        0
Event number:      4
Major, minor:      252, 2
Number of targets: 1
UUID: mpath-36005076304ffc69f0000000000000469


 
Contact Information = Ping Tian Han/pthan at cn.ibm.com, 	Chanh H Nguyen/chnguyen at us.ibm.com 
 
---uname output---
Linux onyxlp2 3.19.0-22-generic #22~14.04.1-Ubuntu SMP Wed Jun 17 10:03:39 UTC 2015 ppc64le ppc64le ppc64le GNU/Linux
 
Machine Type = na 
 
---Steps to Reproduce---
 1. install ubuntu on onyxlp2, which has mpath device
2. ls /dev/mapper, see some mpath device file isn't symbol link
 
Userspace tool common name: na 
 
The userspace tool has the following bit modes: 64-bit 

Userspace rpm: na

Userspace tool obtained from project website:  na 
 
== Comment: #6 - Mauricio Faria De Oliveira <mauricfo at br.ibm.com> - 2015-08-18 12:33:17 ==
This shouldn't be a problem at all.
Either symlinks to the dm devices or block devices which refer to them directly (via major:minor number) will work.

It isn't ideal, though.

== Comment: #7 - Mauricio Faria De Oliveira <mauricfo at br.ibm.com> - 2015-08-18 12:35:34 ==
BTW, that expectation is per the SRU policy.

And the problem cause is likely a race involving udev rules (multipath &
kpartx), and possibly multipathd.

** Affects: multipath-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-ppc64le bugnameltc-127890 severity-medium targetmilestone-inin---
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ISST-LTE: not all mpath device files are symbol link
https://bugs.launchpad.net/bugs/1486370
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