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Bug 1432675

Summary: raid0 -> raid6 conversion needs check for volume having just 2 legs
Product: Red Hat Enterprise Linux 7 Reporter: Corey Marthaler <cmarthal>
Component: lvm2Assignee: Heinz Mauelshagen <heinzm>
lvm2 sub component: Mirroring and RAID QA Contact: cluster-qe <cluster-qe>
Status: CLOSED ERRATA Docs Contact:
Severity: low    
Priority: unspecified CC: agk, heinzm, jbrassow, msnitzer, prajnoha, prockai, zkabelac
Version: 7.4   
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: lvm2-2.02.169-1.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-01 21:49:49 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 Corey Marthaler 2017-03-15 23:06:02 UTC 
Description of problem:

[root@host-087 ~]# lvcreate --type raid0 -i 2 -n raid0 -L 100M VG
  Using default stripesize 64.00 KiB.
  Rounding size 100.00 MiB (25 extents) up to stripe boundary size 104.00 MiB(26 extents).
  Logical volume "raid0" created.

[root@host-087 ~]# lvs -a -o +devices
  LV               VG  Attr       LSize   Cpy%Sync Convert Devices
  raid0            VG  rwi-a-r--- 104.00m                  raid0_rimage_0(0),raid0_rimage_1(0)
  [raid0_rimage_0] VG  iwi-aor---  52.00m                  /dev/sda1(0)
  [raid0_rimage_1] VG  iwi-aor---  52.00m                  /dev/sdb1(0)

[root@host-087 ~]# lvconvert --type raid6 VG/raid0
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 with possible type raid6_n_6.
Do you want to convert raid6 LV VG/raid0 to raid6_n_6? [y/n]: y
  LV raid0 invalid: minimum 5 areas required (is 4) for raid6_n_6 segment
  Internal error: LV segments corrupted in raid0.
  Write of VG VG failed.
  Internal error: Pre callout function failed.


Version-Release number of selected component (if applicable):
3.10.0-609.el7.x86_64


Latest nightly built test rpms:
lvm2-2.02.169-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
lvm2-libs-2.02.169-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
lvm2-cluster-2.02.169-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
device-mapper-1.02.138-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
device-mapper-libs-1.02.138-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
device-mapper-event-1.02.138-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
device-mapper-event-libs-1.02.138-0.1248.el7    BUILT: Mon Feb 27 08:26:32 CST 2017
device-mapper-persistent-data-0.6.3-1.el7    BUILT: Fri Jul 22 05:29:13 CDT 2016
Comment 2 Heinz Mauelshagen 2017-03-16 21:14:30 UTC 
Upstream commit b0336e8b3cb04908119e4cea816e39cdccd1a115
Comment 4 Corey Marthaler 2017-03-28 18:15:10 UTC 
Fix verified in latest rpms.
3.10.0-629.el7.x86_64
lvm2-2.02.169-1.el7    BUILT: Tue Mar 28 10:42:01 CDT 2017


[root@host-073 ~]# lvcreate --type raid0 -i 2 -n raid0 -L 100M test
  Using default stripesize 64.00 KiB.
  Rounding size 100.00 MiB (25 extents) up to stripe boundary size 104.00 MiB(26 extents).
  Logical volume "raid0" created.

[root@host-073 ~]# lvconvert --type raid6 test/raid0
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 with possible type raid6_n_6.
Do you want to convert raid6 LV test/raid0 to raid6_n_6? [y/n]: y
  Minimum of 3 stripes needed for conversion from raid0 to raid6_n_6.
3.10.0-629.el7.x86_64
Comment 5 errata-xmlrpc 2017-08-01 21:49:49 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://access.redhat.com/errata/RHBA-2017:2222