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Bug 836653

Summary:	raid1 mirror reduction finishes "successfully" even though it failed to reduce the legs
Product:	Red Hat Enterprise Linux 6	Reporter:	Corey Marthaler <cmarthal>
Component:	lvm2	Assignee:	Alasdair Kergon <agk>
Status:	CLOSED ERRATA	QA Contact:	Cluster QE <mspqa-list>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.3	CC:	agk, dwysocha, heinzm, jbrassow, msnitzer, nperic, prajnoha, prockai, slevine, thornber, zkabelac
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	lvm2-2.02.97-2.el6	Doc Type:	Bug Fix
Doc Text:	A failure to reduce the size of a Logical Volume was sometimes not detected and 'lvremove' exited successfully even though it had failed. Errors are now detected and reported.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-02-21 08:11:03 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:
Bug Depends On:
Bug Blocks:	840699

Description Corey Marthaler 2012-06-29 20:04:53 UTC

Description of problem:
[root@hayes-01 bin]# lvs -a -o +devices
  LV                 Attr     LSize  Copy%  Devices
  reduce             Rwi-a-m- 52.00m 100.00 reduce_rimage_0(0),reduce_rimage_1(0)
  [reduce_rimage_0]  iwi-aor- 52.00m        /dev/etherd/e1.1p9(1)
  [reduce_rimage_1]  iwi-aor- 52.00m        /dev/etherd/e1.1p8(1)
  [reduce_rmeta_0]   ewi-aor-  4.00m        /dev/etherd/e1.1p9(0)
  [reduce_rmeta_1]   ewi-aor-  4.00m        /dev/etherd/e1.1p8(0)

[root@hayes-01 bin]# lvreduce -f -L 30M /dev/raid_sanity/reduce
  Rounding size to boundary between physical extents: 32.00 MiB
  WARNING: Reducing active logical volume to 32.00 MiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Reducing logical volume reduce to 32.00 MiB
  Unable to reduce RAID LV - operation not implemented.
  Unable to reduce RAID LV - operation not implemented.
  Logical volume reduce successfully resized

[root@hayes-01 bin]# echo $?
0

# Note how the LV is now 32M, but none of the legs are!
[root@hayes-01 bin]# lvs -a -o +devices
  LV                 Attr     LSize  Copy%  Devices
  reduce             Rwi-a-m- 32.00m 100.00 reduce_rimage_0(0),reduce_rimage_1(0)
  [reduce_rimage_0]  iwi-aor- 52.00m        /dev/etherd/e1.1p9(1)
  [reduce_rimage_1]  iwi-aor- 52.00m        /dev/etherd/e1.1p8(1)
  [reduce_rmeta_0]   ewi-aor-  4.00m        /dev/etherd/e1.1p9(0)
  [reduce_rmeta_1]   ewi-aor-  4.00m        /dev/etherd/e1.1p8(0)


Version-Release number of selected component (if applicable):
2.6.32-278.el6.x86_64
lvm2-2.02.95-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
lvm2-libs-2.02.95-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
lvm2-cluster-2.02.95-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
udev-147-2.41.el6    BUILT: Thu Mar  1 13:01:08 CST 2012
device-mapper-1.02.74-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
device-mapper-libs-1.02.74-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
device-mapper-event-1.02.74-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
device-mapper-event-libs-1.02.74-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012
cmirror-2.02.95-10.el6    BUILT: Fri May 18 03:26:00 CDT 2012


How reproducible:
Everytime

Comment 1 Corey Marthaler 2012-06-29 20:05:19 UTC

This should be considered for 6.3.z.

Comment 3 Peter Rajnoha 2012-08-13 12:52:36 UTC

This is fixed in v2.02.97 (http://git.fedorahosted.org/cgit/lvm2.git/commit/?id=a5ddb347e569a953d6732d8d9f72857a560b5bcd):

# lvcreate -L 128m -m1 --type raid1 vg
  Logical volume "lvol0" created

# lvreduce -f -L 30M /dev/vg/lvol0
  Rounding size to boundary between physical extents: 32.00 MiB
  WARNING: Reducing active logical volume to 32.00 MiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Reducing logical volume lvol0 to 32.00 MiB
  Unable to reduce RAID LV - operation not implemented.

# echo $?
5

# lvs
  LV    VG   Attr     LSize   Pool Origin Data%  Move Log Copy%  Convert
  lvol0 vg   rwi-a-m- 128.00m                             100.00

Comment 5 Nenad Peric 2012-10-30 09:10:15 UTC

Verified with :

lvm2-2.02.98-2.el6.x86_64

Comment 6 errata-xmlrpc 2013-02-21 08:11:03 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.

http://rhn.redhat.com/errata/RHBA-2013-0501.html