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Bug 1209445

Summary: When creating a RAID4/5/6 with wrongly formatted options, the creation succeeds.
Product: Red Hat Enterprise Linux 6 Reporter: Nenad Peric <nperic>
Component: lvm2Assignee: Heinz Mauelshagen <heinzm>
lvm2 sub component: Mirroring and RAID (RHEL6) QA Contact: cluster-qe <cluster-qe>
Status: CLOSED ERRATA Docs Contact:
Severity: low    
Priority: unspecified CC: agk, cmarthal, heinzm, jbrassow, msnitzer, prajnoha, prockai, zkabelac
Version: 6.7   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: lvm2-2.02.118-2.el6 Doc Type: Bug Fix
Doc Text:
Cause: Missing check for correct combination of options used when creating RAID4/5/6 LVs. Consequence: lvcreate allowed -m/--mirror option to be specified while creating RAID4/5/6 LVs. This may led users to incorrect assumptions that -m/--mirror option is somehow used, but it was ignored. Fix: A check has been added which prevents incorrect combination with -m/--mirror option to be used while creating RAID4/5/6 LVs. Result: -m/--mirror option is not allowed when creating RAID4/5/6 LVs.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2015-07-22 07:38:33 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Nenad Peric 2015-04-07 11:30:58 UTC 
Description of problem:

Creating a RAID4 with wrongly formatted options suplpied, the creation succeeds and the resulting LV is perhaps not what it was "expected".

Version-Release number of selected component (if applicable):

lvm2-2.02.118-1.el6.x86_64

How reproducible:

Everytime

Steps to Reproduce:
Create VG
Create LV wit wrong options:
 lvcreate  --type raid4 -m 2 -i 3 -n wrong_options -L 500M raid_sanity

Actual results:

This is created (9+1 LVs):
[root@tardis-02 ~]# lvs -a
  LV                       VG          Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  wrong_options            raid_sanity rwi-a-r--- 504.00m                                    100.00          
  [wrong_options_rimage_0] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_1] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_2] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_3] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_4] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_5] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_6] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_7] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_8] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rimage_9] raid_sanity iwi-aor---  56.00m                                                    
  [wrong_options_rmeta_0]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_1]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_2]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_3]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_4]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_5]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_6]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_7]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_8]  raid_sanity ewi-aor---   4.00m                                                    
  [wrong_options_rmeta_9]  raid_sanity ewi-aor---   4.00m                             


Expected results:

Perhaps the creation should not be allowed with options which don't go well together with raid.
Comment 2 Heinz Mauelshagen 2015-04-07 11:47:21 UTC 
LVM command line option and option argument processing as it stands will factor "-m 2" causing 3 legs times "-i 3" for 3 stripes resulting in 9 data images and add another image for the dedicated raid4 parity disk resulting in a grand total of 10 image component pairs  as reported by "lvs -a ...".

The same applies to mappings "raid5" and "raid6".

We'd need a check for raid4/5/6 similar to the one we already have for "mirror", "raid1" and "striped" to avoid "-m #" being applied altogether.
Comment 4 Corey Marthaler 2015-04-07 18:53:28 UTC 
Looks like this is the rhel6.7 version of bug 1194464.
Comment 6 Corey Marthaler 2015-04-29 16:20:44 UTC 
Fix verified in the latest rpms.

2.6.32-554.el6.x86_64
lvm2-2.02.118-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
lvm2-libs-2.02.118-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
lvm2-cluster-2.02.118-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
udev-147-2.61.el6    BUILT: Mon Mar  2 05:08:11 CST 2015
device-mapper-1.02.95-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
device-mapper-libs-1.02.95-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
device-mapper-event-1.02.95-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
device-mapper-event-libs-1.02.95-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015
device-mapper-persistent-data-0.3.2-1.el6    BUILT: Fri Apr  4 08:43:06 CDT 2014
cmirror-2.02.118-2.el6    BUILT: Wed Apr 15 06:34:08 CDT 2015


# RAID1
[root@host-078 ~]# lvcreate --type raid1 -m 2 -i 3 -n wrong_options -L 500M VG
  Using default stripesize 64.00 KiB.
  Stripe argument cannot be used with segment type, raid1
  Run `lvcreate --help' for more information.

# RAID4
[root@host-078 ~]# lvcreate --type raid4 -m 2 -i 3 -n wrong_options -L 500M VG
  Using default stripesize 64.00 KiB.
  Mirror argument cannot be used with segment type, raid4
  Run `lvcreate --help' for more information.

# RAID5
[root@host-078 ~]# lvcreate --type raid5 -m 2 -i 3 -n wrong_options -L 500M VG
  Using default stripesize 64.00 KiB.
  Mirror argument cannot be used with segment type, raid5
  Run `lvcreate --help' for more information.

# RAID6
[root@host-078 ~]# lvcreate --type raid6 -m 2 -i 3 -n wrong_options -L 500M VG
  Using default stripesize 64.00 KiB.
  Mirror argument cannot be used with segment type, raid6
  Run `lvcreate --help' for more information.
Comment 7 errata-xmlrpc 2015-07-22 07:38:33 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1411.html