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Bug 1369253

Summary: raid take over attempt from raid10 -> raid1|mirror should fail with a 'not yet supported' message
Product: Red Hat Enterprise Linux 7 Reporter: Corey Marthaler <cmarthal>
Component: lvm2Assignee: LVM and device-mapper development team <lvm-team>
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, mnavrati, msnitzer, prajnoha, prockai, zkabelac
Version: 7.3   
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: lvm2-2.02.164-3.el7 Doc Type: No Doc Update
Doc Text:
Intra-release bug, no documentation needed.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2016-11-04 04:18:07 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 2016-08-22 20:38:41 UTC 
Description of problem:

# latest rpm: lvm2-2.02.164-2.el7.x86_64

# raid10 volume
[root@host-116 ~]# lvs -a -o +devices
  LV              VG     Attr       LSize Cpy%Sync Devices
  POOL            test   rwi-a-r--- 4.00g 100.00   POOL_rimage_0(0),POOL_rimage_1(0),POOL_rimage_2(0),POOL_rimage_3(0)
  [POOL_rimage_0] test   iwi-aor--- 2.00g          /dev/sda1(1)
  [POOL_rimage_1] test   iwi-aor--- 2.00g          /dev/sdb1(1)
  [POOL_rimage_2] test   iwi-aor--- 2.00g          /dev/sdc1(1)
  [POOL_rimage_3] test   iwi-aor--- 2.00g          /dev/sdd1(1)
  [POOL_rmeta_0]  test   ewi-aor--- 4.00m          /dev/sda1(0)
  [POOL_rmeta_1]  test   ewi-aor--- 4.00m          /dev/sdb1(0)
  [POOL_rmeta_2]  test   ewi-aor--- 4.00m          /dev/sdc1(0)
  [POOL_rmeta_3]  test   ewi-aor--- 4.00m          /dev/sdd1(0)

# convert to raid1 attempt
[root@host-116 ~]# lvconvert --type raid1 -m 1 test/POOL
  LV POOL invalid: minimum 4 areas required (is 2) for raid10 segment
  Internal error: LV segments corrupted in POOL.
  Failed to write changes to POOL in test

# convert to mirror attempt
[root@host-116 ~]# lvconvert --type mirror -m 1 test/POOL
  Conversion operation not yet supported.





# older rpm: lvm2-2.02.160-1.el7.x86_64

# raid10 volume
[root@host-117 ~]# lvs -a -o +devices
  LV              VG     Attr       LSize Cpy%Sync Devices
  POOL            test   rwi-a-r--- 2.00g 100.00   POOL_rimage_0(0),POOL_rimage_1(0),POOL_rimage_2(0),POOL_rimage_3(0)
  [POOL_rimage_0] test   iwi-aor--- 1.00g          /dev/sda1(1)
  [POOL_rimage_1] test   iwi-aor--- 1.00g          /dev/sdb1(1)
  [POOL_rimage_2] test   iwi-aor--- 1.00g          /dev/sdc1(1)
  [POOL_rimage_3] test   iwi-aor--- 1.00g          /dev/sdd1(1)
  [POOL_rmeta_0]  test   ewi-aor--- 4.00m          /dev/sda1(0)
  [POOL_rmeta_1]  test   ewi-aor--- 4.00m          /dev/sdb1(0)
  [POOL_rmeta_2]  test   ewi-aor--- 4.00m          /dev/sdc1(0)
  [POOL_rmeta_3]  test   ewi-aor--- 4.00m          /dev/sdd1(0)

# convert to raid1 attempt
[root@host-117 ~]# lvconvert --type raid1 -m 1 test/POOL
  device-mapper: reload ioctl on (253:10) failed: Input/output error
  Failed to suspend test/POOL before committing changes

# convert to mirror attempt
[root@host-117 ~]# lvconvert --type mirror -m 1 test/POOL
  WARNING: Reading VG test from disk because lvmetad metadata is invalid.
  device-mapper: reload ioctl on (253:10) failed: Input/output error
  Failed to suspend test/POOL before committing changes
Comment 2 Alasdair Kergon 2016-08-23 21:55:18 UTC 
It's like the problems we've seen elsewhere.  The -m is dominating and it's not even looking at the --type and trying to change the number of mirrors on raid10 when we only support 2.
Comment 3 Alasdair Kergon 2016-08-23 22:03:43 UTC 
And doesn't look like a regression - this wasn't working properly before this last set of changes either, albeit hitting a different failure mode.
Comment 4 Alasdair Kergon 2016-08-23 22:42:45 UTC 
Fixed in next release.

(The contents of the error messages when you attempt something disallowed remain a bit inconsistent at times, but that level of tidy up will have to wait for RHEL 7.4.)
Comment 5 Alasdair Kergon 2016-08-23 22:44:10 UTC 
The new message is simply:

  --mirrors/-m cannot be changed with raid10.
Comment 7 Corey Marthaler 2016-08-26 17:19:43 UTC 
Fix verified in the latest rpms.


lvm2-2.02.164-3.el7    BUILT: Wed Aug 24 05:20:41 CDT 2016
lvm2-libs-2.02.164-3.el7    BUILT: Wed Aug 24 05:20:41 CDT 2016
lvm2-cluster-2.02.164-3.el7    BUILT: Wed Aug 24 05:20:41 CDT 2016



[root@host-117 ~]# lvs -a -o +devices
  LV              VG    Attr       LSize  Log Cpy%Sync Devices
  POOL            test  rwi-a-r--- 2.00g      100.00   POOL_rimage_0(0),POOL_rimage_1(0),POOL_rimage_2(0),POOL_rimage_3(0)
  [POOL_rimage_0] test  iwi-aor--- 1.00g               /dev/sda1(1)
  [POOL_rimage_1] test  iwi-aor--- 1.00g               /dev/sdb1(1)
  [POOL_rimage_2] test  iwi-aor--- 1.00g               /dev/sdc1(1)
  [POOL_rimage_3] test  iwi-aor--- 1.00g               /dev/sdd1(1)
  [POOL_rmeta_0]  test  ewi-aor--- 4.00m               /dev/sda1(0)
  [POOL_rmeta_1]  test  ewi-aor--- 4.00m               /dev/sdb1(0)
  [POOL_rmeta_2]  test  ewi-aor--- 4.00m               /dev/sdc1(0)
  [POOL_rmeta_3]  test  ewi-aor--- 4.00m               /dev/sdd1(0)

test-POOL: 0 4194304 raid raid10 4 AAAA 4194304/4194304 idle 0 0

[root@host-117 ~]# lvconvert --type raid1 -m 1 test/POOL
  --mirrors/-m cannot be changed with raid10.
[root@host-117 ~]# lvconvert --type mirror -m 1 test/POOL
  --mirrors/-m cannot be changed with raid10.

[root@host-117 ~]# lvconvert --type raid1 -m 2 test/POOL
  --mirrors/-m cannot be changed with raid10.
[root@host-117 ~]# lvconvert --type mirror -m 2 test/POOL
  --mirrors/-m cannot be changed with raid10.
Comment 9 errata-xmlrpc 2016-11-04 04:18:07 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-2016-1445.html