1102949 – RFE: allow pvs in cache volumes to be vgsplit off

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Bug 1102949 - RFE: allow pvs in cache volumes to be vgsplit off

Summary: RFE: allow pvs in cache volumes to be vgsplit off

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	lvm2
Sub Component:
Version:	7.0
Hardware:	x86_64
OS:	Linux
Priority:	unspecified
Severity:	low
Target Milestone:	rc
Target Release:	---
Assignee:	Zdenek Kabelac
QA Contact:	cluster-qe@redhat.com
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	1119326 1186924
TreeView+	depends on / blocked

Reported:	2014-05-29 21:35 UTC by Corey Marthaler
Modified:	2021-09-03 12:53 UTC (History)
CC List:	9 users (show)
Fixed In Version:	lvm2-2.02.185-1.el7
Doc Type:	Enhancement
Doc Text:
Clone Of:
Environment:
Last Closed:	2019-08-06 13:10:41 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2019:2253	0	None	None	None	2019-08-06 13:11:12 UTC

Description Corey Marthaler 2014-05-29 21:35:10 UTC

Description of problem:
[root@harding-03 ~]# pvscan
  PV /dev/sdc2   VG cache_sanity      lvm2 [46.57 GiB / 44.55 GiB free]
  PV /dev/sdc1   VG cache_sanity      lvm2 [46.58 GiB / 46.58 GiB free]
  PV /dev/sdb2   VG cache_sanity      lvm2 [46.57 GiB / 46.57 GiB free]
  PV /dev/sdb1   VG cache_sanity      lvm2 [46.58 GiB / 42.58 GiB free]

[root@harding-03 ~]# lvs -a -o +devices
  LV                    VG            Attr       LSize  Pool          Origin          Devices
  corigin               cache_sanity  Cwi---C---  4.00g display_cache [corigin_corig] corigin_corig(0)
  [corigin_corig]       cache_sanity  -wi-------  4.00g                               /dev/sdb1(0)
  display_cache         cache_sanity  Cwi---C---  2.00g                               display_cache_cdata(0)
  [display_cache_cdata] cache_sanity  Cwi---C---  2.00g                               /dev/sdc2(0)
  [display_cache_cmeta] cache_sanity  ewi---C---  8.00m                               /dev/sdc2(512)
  [lvol0_pmspare]       cache_sanity  ewi-------  8.00m                               /dev/sdc2(514)

[root@harding-03 ~]# vgsplit cache_sanity cache_sanity_new /dev/sdc2 /dev/sdb1
  Unable to split VG while it contains cache LVs



Version-Release number of selected component (if applicable):
3.10.0-110.el7.x86_64
lvm2-2.02.105-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
lvm2-libs-2.02.105-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
lvm2-cluster-2.02.105-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
device-mapper-1.02.84-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
device-mapper-libs-1.02.84-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
device-mapper-event-1.02.84-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
device-mapper-event-libs-1.02.84-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014
device-mapper-persistent-data-0.2.8-4.el7    BUILT: Fri Jan 24 14:28:55 CST 2014
cmirror-2.02.105-14.el7    BUILT: Wed Mar 26 08:29:41 CDT 2014

Comment 5 Zdenek Kabelac 2019-04-16 14:14:49 UTC

Supported with stable-2.02 branch patch:

https://www.redhat.com/archives/lvm-devel/2019-April/msg00061.html

Comment 9 Corey Marthaler 2019-05-14 20:51:53 UTC

Verified in the latest rpms.

3.10.0-1046.el7.x86_64

lvm2-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
lvm2-libs-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
lvm2-cluster-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
lvm2-lockd-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
lvm2-python-boom-0.9-17.el7.2    BUILT: Mon May 13 04:37:00 CDT 2019
cmirror-2.02.185-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-libs-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-event-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-event-libs-1.02.158-1.el7    BUILT: Mon May 13 04:36:30 CDT 2019
device-mapper-persistent-data-0.8.1-1.el7    BUILT: Sat May  4 14:53:53 CDT 2019



[root@hayes-03 ~]# pvscan
  PV /dev/sdb1   VG seven           lvm2 [446.62 GiB / 446.62 GiB free]
  PV /dev/sdc1   VG seven           lvm2 [446.62 GiB / 446.62 GiB free]
  PV /dev/sdd1   VG seven           lvm2 [446.62 GiB / 446.62 GiB free]
  PV /dev/sde1   VG seven           lvm2 [446.62 GiB / 446.62 GiB free]
  PV /dev/sdf1   VG seven           lvm2 [<1.82 TiB / <1.82 TiB free]
  PV /dev/sdi1   VG seven           lvm2 [<1.82 TiB / <1.82 TiB free]
  Total: 6 [5.38 TiB] / in use: 6 [5.38 TiB] / in no VG: 0 [0   ]

[root@hayes-03 ~]# lvcreate -L 1G -n origin seven /dev/sde1
  Logical volume "origin" created.
[root@hayes-03 ~]# lvcreate -L 200M -n cache seven /dev/sdi1
  Logical volume "cache" created.
[root@hayes-03 ~]# lvcreate -L 8M -n cache_meta seven /dev/sdi1
  Logical volume "cache_meta" created.
[root@hayes-03 ~]# lvconvert --yes --type cache-pool --poolmetadata seven/cache_meta seven/cache
  WARNING: Converting seven/cache and seven/cache_meta to cache pool's data and metadata volumes with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted seven/cache and seven/cache_meta to cache pool.
[root@hayes-03 ~]# lvconvert --yes --type cache --cachepool seven/cache seven/origin
  Logical volume seven/origin is now cached.

[root@hayes-03 ~]# lvs -a -o +devices
  Unknown feature in status: 8 18/2048 128 9/3200 0 49 0 0 0 9 0 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 smq 0 rw - 
  Unknown feature in status: 8 18/2048 128 9/3200 0 49 0 0 0 9 0 3 metadata2 writethrough no_discard_passdown 2 migration_threshold 2048 smq 0 rw - 
  LV              VG    Attr       LSize   Pool    Origin         Data%  Meta%  Move Log Cpy%Sync Convert Devices        
  [cache]         seven Cwi---C--- 200.00m                        0.28   0.88            0.00             cache_cdata(0) 
  [cache_cdata]   seven Cwi-ao---- 200.00m                                                                /dev/sdi1(0)   
  [cache_cmeta]   seven ewi-ao----   8.00m                                                                /dev/sdi1(50)  
  [lvol0_pmspare] seven ewi-------   8.00m                                                                /dev/sdb1(0)   
  origin          seven Cwi-a-C---   1.00g [cache] [origin_corig] 0.28   0.88            0.00             origin_corig(0)
  [origin_corig]  seven owi-aoC---   1.00g                                                                /dev/sde1(0)   


# Verify that a cache PVs can't be split off w/o being deactivated first
[root@hayes-03 ~]# vgsplit seven ten /dev/sde1 /dev/sdi1
  Logical volume seven/cache_cdata (part of cache) must be inactive.

[root@hayes-03 ~]# vgchange -an seven
  0 logical volume(s) in volume group "seven" now active

# Verify that just a single cache PV can't be split w/o the other
[root@hayes-03 ~]# vgsplit seven ten /dev/sde1 
  Cannot split cache origin ten/origin_corig and its cache pool data seven/cache_cdata into separate VGs.

# Verify cache pool and origin PVs can be split now
[root@hayes-03 ~]# vgsplit seven ten /dev/sde1 /dev/sdi1
  New volume group "ten" successfully split from "seven"

[root@hayes-03 ~]# lvs -a -o +devices
  LV              VG    Attr       LSize   Pool    Origin         Data%  Meta%  Move Log Cpy%Sync Convert Devices        
  [lvol0_pmspare] seven ewi-------   8.00m                                                                /dev/sdb1(0)   
  [cache]         ten   Cwi---C--- 200.00m                                                                cache_cdata(0) 
  [cache_cdata]   ten   Cwi------- 200.00m                                                                /dev/sdi1(0)   
  [cache_cmeta]   ten   ewi-------   8.00m                                                                /dev/sdi1(50)  
  origin          ten   Cwi---C---   1.00g [cache] [origin_corig]                                         origin_corig(0)
  [origin_corig]  ten   owi---C---   1.00g                                                                /dev/sde1(0)

Comment 10 Corey Marthaler 2019-05-14 21:02:31 UTC

FYI - a side effect of this is bug 1710096.

Comment 12 errata-xmlrpc 2019-08-06 13:10:41 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-2019:2253

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