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Bug 1573960

Summary:	lvconvert - don't return success doing -m conversion on degraded raid1 LV
Product:	Red Hat Enterprise Linux 7	Reporter:	Heinz Mauelshagen <heinzm>
Component:	lvm2	Assignee:	Heinz Mauelshagen <heinzm>
lvm2 sub component:	Mirroring and RAID	QA Contact:	cluster-qe <cluster-qe>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	unspecified
Priority:	unspecified	CC:	agk, cmarthal, heinzm, jbrassow, msnitzer, prajnoha, rbednar, rhandlin, zkabelac
Version:	7.5	Keywords:	Reopened
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	lvm2-2.02.178-1.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-10-30 11:02:26 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 Heinz Mauelshagen 2018-05-02 15:19:34 UTC

Description of problem:
"lvconvert -mN RaidLV" was used to try repairing a degraded raid1 LV
instead of the recommended "lvconvert --repair RaidLV"

Version-Release number of selected component (if applicable):
2.02.177(2)-RHEL7

How reproducible:
Always

Steps to Reproduce:
1. create e.g. 2-legged raid1 LV in VG with 2 PVs
2. fail 1 PV
3. run "lvconvert -m1 RaidLV"

Actual results:
Leaves the raid1 LV degraded but returns success

Expected results:
Don't return success because the degraded raid1 LV has 2 legs still (one inoperational). Error report in this degraded situation.

Additional info:
https://bugzilla.redhat.com/show_bug.cgi?id=1572528 documents the bogus "lvconvert -m ..." use/behaviour.

Comment 2 Heinz Mauelshagen 2018-05-03 16:52:21 UTC

lvm2 upstream commit 4ebfd8e8eb68442efc334b35bc1f22eda3e4dd3d

Comment 3 Red Hat Bugzilla Rules Engine 2018-05-03 16:52:30 UTC

Development Management has reviewed and declined this request. You may appeal this decision by reopening this request.

Comment 7 Roman Bednář 2018-08-07 09:32:33 UTC

Verified.


# lvs -a -o lv_name,devices
  LV               Devices                            
  root             /dev/vda2(205)                     
  swap             /dev/vda2(0)                       
  raid1            raid1_rimage_0(0),raid1_rimage_1(0)
  [raid1_rimage_0] /dev/sda1(1)                       
  [raid1_rimage_1] /dev/sdb1(1)                       
  [raid1_rmeta_0]  /dev/sda1(0)                       
  [raid1_rmeta_1]  /dev/sdb1(0) 


# echo "offline" > /sys/block/sda/device/state

# pvscan
  /dev/sda: open failed: No such device or address
  Error reading device /dev/sda1 at 0 length 4.
  Error reading device /dev/sda1 at 4096 length 4.
  PV /dev/sda1   VG vg              lvm2 [<29.99 GiB / 28.98 GiB free]
  PV /dev/sdb1   VG vg              lvm2 [<29.99 GiB / 28.98 GiB free]
  ....
  ....
  Total: 11 [306.97 GiB] / in use: 3 [66.97 GiB] / in no VG: 8 [<240.00 Gi

# vgreduce --removemissing -f vg
  WARNING: Not using lvmetad because a repair command was run.
  /dev/sda: open failed: No such device or address
  Couldn't find device with uuid xK7r9b-RZ0o-NBM8-6RH5-Pnwm-ovOF-FUNNYX.
  WARNING: Couldn't find all devices for LV vg/raid1_rimage_0 while checking used and assumed devices.
  WARNING: Couldn't find all devices for LV vg/raid1_rmeta_0 while checking used and assumed devices.
  Wrote out consistent volume group vg.


# vgextend vg /dev/sdc1
  WARNING: Not using lvmetad because a repair command was run.
  /dev/sda: open failed: No such device or address
  /dev/sda1: open failed: No such device or address
  /dev/sda: open failed: No such device or address
  /dev/sda1: open failed: No such device or address
  Volume group "vg" successfully extended

# lvconvert -y -m 1 vg/raid1 /dev/sdc1
  WARNING: Not using lvmetad because a repair command was run.
  /dev/sda: open failed: No such device or address
  /dev/sda1: open failed: No such device or address
  Can't change number of mirrors of degraded vg/raid1.
  Please run "lvconvert --repair vg/raid1" first.
  WARNING: vg/raid1 already has image count of 2.

# lvconvert --repair vg/raid1
  WARNING: Disabling lvmetad cache for repair command.
  WARNING: Not using lvmetad because of repair.
  /dev/sda: open failed: No such device or address
  /dev/sda1: open failed: No such device or address
Attempt to replace failed RAID images (requires full device resync)? [y/n]: y
  Faulty devices in vg/raid1 successfully replaced.

# lvs -a -o lv_name,devices
  WARNING: Not using lvmetad because a repair command was run.
  /dev/sda: open failed: No such device or address
  /dev/sda1: open failed: No such device or address
  LV               Devices                            
  root             /dev/vda2(205)                     
  swap             /dev/vda2(0)                       
  raid1            raid1_rimage_0(0),raid1_rimage_1(0)
  [raid1_rimage_0] /dev/sdc1(1)                       
  [raid1_rimage_1] /dev/sdb1(1)                       
  [raid1_rmeta_0]  /dev/sdc1(0)                       
  [raid1_rmeta_1]  /dev/sdb1(0)  


3.10.0-926.el7.x86_64

lvm2-2.02.180-1.el7    BUILT: Fri Jul 20 19:21:35 CEST 2018

Comment 9 errata-xmlrpc 2018-10-30 11:02:26 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-2018:3193