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Bug 1255171 - cache_policy no longer displays anything in lvs
Summary: cache_policy no longer displays anything in lvs
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2
Version: 7.2
Hardware: x86_64
OS: Linux
high
medium
Target Milestone: rc
: ---
Assignee: Zdenek Kabelac
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2015-08-19 20:29 UTC by Corey Marthaler
Modified: 2023-03-08 07:27 UTC (History)
6 users (show)

Fixed In Version: lvm2-2.02.129-2.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-11-19 12:47:24 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:2147 0 normal SHIPPED_LIVE lvm2 bug fix and enhancement update 2015-11-19 11:11:07 UTC

Description Corey Marthaler 2015-08-19 20:29:38 UTC 
Description of problem:
lvm2-2.02.127-1.el7    BUILT: Mon Aug 10 03:22:35 CDT 2015
lvm2-libs-2.02.127-1.el7    BUILT: Mon Aug 10 03:22:35 CDT 2015

[root@host-115 ~]#  lvs -a -o +devices,cache_policy
  LV                    VG            Attr       LSize   Pool   Origin                Data%  Meta%  Move Log Cpy%Sync Convert Devices                Cache Policy
  display_cache         cache_sanity  Cwi-a-C---   4.00g [pool] [display_cache_corig] 0.00   8.66            100.00           display_cache_corig(0) mq          
  [display_cache_corig] cache_sanity  owi-aoC---   4.00g                                                                      /dev/sdd1(0)                       
  [lvol0_pmspare]       cache_sanity  ewi-------  12.00m                                                                      /dev/sdc1(0)                       
  [pool]                cache_sanity  Cwi---C---   4.00g                              0.00   8.66            100.00           pool_cdata(0)                      
  [pool_cdata]          cache_sanity  Cwi-ao----   4.00g                                                                      /dev/sdb1(0)                       
  [pool_cmeta]          cache_sanity  ewi-ao----  12.00m                                                                      /dev/sdb1(1024)                    
[root@host-115 ~]# lvchange --yes --cachepolicy smq cache_sanity/display_cache
  Logical volume "display_cache" changed.
[root@host-115 ~]#  lvs -a -o +devices,cache_policy
  LV                    Attr       LSize   Pool   Origin                Data% Meta%  Cpy%Sync Devices                Cache Policy
  display_cache         Cwi-a-C---   4.00g [pool] [display_cache_corig] 0.00  12.92  100.00   display_cache_corig(0) smq         
  [display_cache_corig] owi-aoC---   4.00g                                                    /dev/sdd1(0)                       
  [lvol0_pmspare]       ewi-------  12.00m                                                    /dev/sdc1(0)                       
  [pool]                Cwi---C---   4.00g                              0.00  12.92  100.00   pool_cdata(0)                      
  [pool_cdata]          Cwi-ao----   4.00g                                                    /dev/sdb1(0)                       
  [pool_cmeta]          ewi-ao----  12.00m                                                    /dev/sdb1(1024)                    

[root@host-115 ~]#  lvs --noheadings -o lv_name --select 'cache_policy=smq'
  display_cache

[root@host-115 ~]#  dmsetup status cache_sanity-display_cache
0 8388608 cache 8 397/3072 64 0/131072 0 128 0 0 0 0 0 1 writeback 2 migration_threshold 2048 smq 0 rw - 





lvm2-2.02.128-1.el7    BUILT: Tue Aug 18 03:45:17 CDT 2015
lvm2-libs-2.02.128-1.el7    BUILT: Tue Aug 18 03:45:17 CDT 2015

[root@host-109 ~]#  lvs -a -o +devices,cache_policy
  LV                    Attr       LSize   Pool   Origin                Data% Meta%  Cpy%Sync Devices                Cache Policy
  display_cache         Cwi-a-C---   4.00g [pool] [display_cache_corig] 0.00  4.39   100.00   display_cache_corig(0)             
  [display_cache_corig] owi-aoC---   4.00g                                                    /dev/sdc1(0)                       
  [lvol0_pmspare]       ewi-------  12.00m                                                    /dev/sdc1(1024)                    
  [pool]                Cwi---C---   4.00g                              0.00  4.39   100.00   pool_cdata(0)                      
  [pool_cdata]          Cwi-ao----   4.00g                                                    /dev/sde1(0)                       
  [pool_cmeta]          ewi-ao----  12.00m                                                    /dev/sde1(1024)                    
[root@host-109 ~]# lvchange --yes --cachepolicy smq cache_sanity/display_cache
  Logical volume "display_cache" changed.
[root@host-109 ~]#  lvs -a -o +devices,cache_policy
  LV                    Attr       LSize   Pool   Origin                Data% Meta%  Cpy%Sync Devices                Cache Policy
  display_cache         Cwi-a-C---   4.00g [pool] [display_cache_corig] 0.00  6.58   100.00   display_cache_corig(0)             
  [display_cache_corig] owi-aoC---   4.00g                                                    /dev/sdc1(0)                       
  [lvol0_pmspare]       ewi-------  12.00m                                                    /dev/sdc1(1024)                    
  [pool]                Cwi---C---   4.00g                              0.00  6.58   100.00   pool_cdata(0)                      
  [pool_cdata]          Cwi-ao----   4.00g                                                    /dev/sde1(0)                       
  [pool_cmeta]          ewi-ao----  12.00m                                                    /dev/sde1(1024)                    

[root@host-109 ~]# lvs --noheadings -o lv_name --select 'cache_policy=smq'
  display_cache

[root@host-109 ~]# dmsetup status cache_sanity-display_cache
0 8388608 cache 8 202/3072 128 0/65536 0 122 0 0 0 0 0 1 writethrough 2 migration_threshold 2048 smq 0 rw - 



Version-Release number of selected component (if applicable):
lvm2-2.02.128-1.el7    BUILT: Tue Aug 18 03:45:17 CDT 2015
lvm2-libs-2.02.128-1.el7    BUILT: Tue Aug 18 03:45:17 CDT 2015
Comment 1 Corey Marthaler 2015-08-19 20:37:46 UTC 
Little easier to see the problem here and fwiw 'cache_policy' and 'cachepolicy' provide the same result in each example.

lvm2-2.02.127-1.el7.x86_64

[root@host-115 ~]#  lvs -o devices,cachepolicy
  Devices                Cache Policy
  display_cache_corig(0) smq         



lvm2-2.02.128-1.el7.x86_64

[root@host-109 ~]#  lvs -o devices,cachepolicy
  Devices                Cache Policy
  display_cache_corig(0)
Comment 2 Corey Marthaler 2015-08-19 21:25:01 UTC 
This is most likely fallout from bug 1255184.
Comment 3 Zdenek Kabelac 2015-08-20 09:20:06 UTC 
The only major bug  ATM is that lvchange let you change the cache policy.

This operation is not yet working properly.


For now to get 'smq' cached LV - you need to directly create it with such policy.
Change from  mq->smq  or  smq->mq  is not possible without clearing cache first
and reinitializing metadata.

Under normal circumstance cache policy should by only shown with cached device
(and I'll likely add some for cache pool)
Comment 4 Corey Marthaler 2015-08-20 17:10:02 UTC 
After following your instructions in comment #3 by not using 'lvchange', the same problem persists even with a properly cached device (pool + origin).




# lvm2-2.02.128-1.el7.x86_64

[root@host-109 ~]# lvs -a -o +devices
  LV            Attr       LSize Pool Origin Data%  Meta%  Cpy%Sync Devices       
  display_cache -wi-a----- 4.00g                                    /dev/sda1(0)  

[root@host-109 ~]# lvcreate --yes --cachepolicy smq -L 4G -n pool cache_sanity --type cache-pool --cachemode writethrough  -c 64 /dev/sdc1
  Logical volume "pool" created.

# Nothing displayed
[root@host-109 ~]# lvs -a -o +devices,cache_policy,cache_mode
  LV              Attr       LSize Pool Origin Data%  Meta%  Cpy%Sync Devices        Cache Policy Cachemode   
  display_cache   -wi-a----- 4.00g                                    /dev/sda1(0)                            
  [lvol0_pmspare] ewi------- 8.00m                                    /dev/sdc1(0)                            
  pool            Cwi---C--- 4.00g                                    pool_cdata(0)               writethrough
  [pool_cdata]    Cwi------- 4.00g                                    /dev/sdc1(4)                            
  [pool_cmeta]    ewi------- 8.00m                                    /dev/sdc1(2)                            

[root@host-109 ~]#  lvconvert --yes --type cache --cachepool cache_sanity/pool cache_sanity/display_cache
  Logical volume cache_sanity/display_cache is now cached.

# Still nothing displayed
[root@host-109 ~]# lvs -a -o +devices,cache_policy,cache_mode
  LV                    Attr       LSize Pool   Origin                Data%  Meta%  Cpy%Sync Devices                Cache Policy Cachemode   
  display_cache         Cwi-a-C--- 4.00g [pool] [display_cache_corig] 0.00   6.59   100.00   display_cache_corig(0)              writethrough
  [display_cache_corig] owi-aoC--- 4.00g                                                     /dev/sda1(0)                                    
  [lvol0_pmspare]       ewi------- 8.00m                                                     /dev/sdc1(0)                                    
  [pool]                Cwi---C--- 4.00g                              0.00   6.59   100.00   pool_cdata(0)                       writethrough
  [pool_cdata]          Cwi-ao---- 4.00g                                                     /dev/sdc1(4)                                    
  [pool_cmeta]          ewi-ao---- 8.00m                                                     /dev/sdc1(2)                                    

[root@host-109 ~]# dmsetup status
cache_sanity-display_cache: 0 8388608 cache 8 135/2048 128 0/65536 0 61 0 0 0 0 0 1 writethrough 2 migration_threshold 2048 smq 0 rw - 
cache_sanity-display_cache_corig: 0 8388608 linear 
cache_sanity-pool_cdata: 0 8388608 linear 
cache_sanity-pool_cmeta: 0 16384 linear 






# lvm2-2.02.127-1.el7

# same operations as above before this convert...

[root@host-115 ~]# lvconvert --yes --type cache --cachepool cache_sanity/pool cache_sanity/display_cache
  Logical volume cache_sanity/display_cache is now cached.

# here the proper policy is displayed.
[root@host-115 ~]# lvs -a -o +devices,cache_policy,cache_mode
  LV                    Attr       LSize Pool   Origin                Data%  Meta%  Cpy%Sync Devices                Cache Policy Cachemode   
  display_cache         Cwi-a-C--- 4.00g [pool] [display_cache_corig] 0.00   6.59   100.00   display_cache_corig(0) smq          writethrough
  [display_cache_corig] owi-aoC--- 4.00g                                                     /dev/sde1(0)                                    
  [lvol0_pmspare]       ewi------- 8.00m                                                     /dev/sdc1(0)                                    
  [pool]                Cwi---C--- 4.00g                              0.00   6.59   100.00   pool_cdata(0)                       writethrough
  [pool_cdata]          Cwi-ao---- 4.00g                                                     /dev/sdc1(4)                                    
  [pool_cmeta]          ewi-ao---- 8.00m                                                     /dev/sdc1(2)                                    

[root@host-115 ~]# dmsetup status
cache_sanity-display_cache: 0 8388608 cache 8 135/2048 128 0/65536 0 61 0 0 0 0 0 1 writethrough 2 migration_threshold 2048 smq 0 rw - 
cache_sanity-display_cache_corig: 0 8388608 linear 
cache_sanity-pool_cdata: 0 8388608 linear 
cache_sanity-pool_cmeta: 0 16384 linear
Comment 7 Zdenek Kabelac 2015-08-26 11:48:01 UTC 
Reporting is handled now by:

https://www.redhat.com/archives/lvm-devel/2015-August/msg00184.html

lvchange is not yet fixed - thus keeping bug still open.
Comment 8 Jonathan Earl Brassow 2015-09-02 15:38:31 UTC 
display seems fixed:

[root@bp-01 ~]# lvcreate -n cachepool -L 5G --type cache vg/lv
  Logical volume vg/lv is now cached.
[root@bp-01 ~]# lvs -o name,cache_policy vg
  LV   Cache Policy
  lv   mq
Comment 10 Corey Marthaler 2015-09-08 14:46:53 UTC 
Marking verified in the latest rpms.

3.10.0-313.el7.x86_64
lvm2-2.02.129-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
lvm2-libs-2.02.129-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
lvm2-cluster-2.02.129-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
device-mapper-1.02.106-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
device-mapper-libs-1.02.106-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
device-mapper-event-1.02.106-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
device-mapper-event-libs-1.02.106-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
device-mapper-persistent-data-0.5.5-1.el7    BUILT: Thu Aug 13 09:58:10 CDT 2015
cmirror-2.02.129-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015
sanlock-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
sanlock-lib-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
lvm2-lockd-2.02.129-2.el7    BUILT: Wed Sep  2 02:51:56 CDT 2015



[root@host-109 ~]# lvs -a -o +devices,cachemode,cache_policy
  LV                    Attr       LSize   Pool   Origin                Data%  Meta%  Cpy%Sync Devices                                      Cachemode Cache Policy
  display_cache         Cwi-a-C---   4.01g [pool] [display_cache_corig] 0.00   12.99  0.00     display_cache_corig(0)                       writeback smq
  [display_cache_corig] owi-aoC---   4.01g                                                     /dev/sdc1(0),/dev/sdd1(0),/dev/sdc2(0)
  [lvol0_pmspare]       ewi-------  12.00m                                                     /dev/sdb2(343)
  [pool]                Cwi---C---   4.01g                              0.00   12.99  0.00     pool_cdata(0)                                writeback smq
  [pool_cdata]          Cwi-ao----   4.01g                                                     /dev/sdb2(0),/dev/sdb1(0),/dev/sdf2(0)
  [pool_cmeta]          ewi-ao----  12.00m                                                     /dev/sdb2(342),/dev/sdb1(342),/dev/sdf2(342)

[root@host-109 ~]# lvs --noheadings -o lv_name --select 'cachemode=writeback && cachepolicy=smq' 
  display_cache

[root@host-109 ~]# lvs -a -o +devices,cachemode,cachepolicy
  LV                    Attr       LSize   Pool   Origin                Data%  Meta%  Cpy%Sync Devices                                      Cachemode Cache Policy
  display_cache         Cwi-a-C---   4.01g [pool] [display_cache_corig] 0.00   12.99  0.00     display_cache_corig(0)                       writeback smq
  [display_cache_corig] owi-aoC---   4.01g                                                     /dev/sdc1(0),/dev/sdd1(0),/dev/sdc2(0)
  [lvol0_pmspare]       ewi-------  12.00m                                                     /dev/sdb2(343)
  [pool]                Cwi---C---   4.01g                              0.00   12.99  0.00     pool_cdata(0)                                writeback smq
  [pool_cdata]          Cwi-ao----   4.01g                                                     /dev/sdb2(0),/dev/sdb1(0),/dev/sdf2(0)
  [pool_cmeta]          ewi-ao----  12.00m                                                     /dev/sdb2(342),/dev/sdb1(342),/dev/sdf2(342)

[root@host-109 ~]# lvchange --cachepolicy cleaner cache_sanity/display_cache
  Logical volume "display_cache" changed.

[root@host-109 ~]# lvs -a -o +devices,cachemode,cachepolicy
  LV                    Attr       LSize   Pool   Origin                Data%  Meta%  Cpy%Sync Devices                                      Cachemode Cache Policy
  display_cache         Cwi-a-C---   4.01g [pool] [display_cache_corig] 0.00   12.99  0.00     display_cache_corig(0)                       writeback cleaner
  [display_cache_corig] owi-aoC---   4.01g                                                     /dev/sdc1(0),/dev/sdd1(0),/dev/sdc2(0)
  [lvol0_pmspare]       ewi-------  12.00m                                                     /dev/sdb2(343)
  [pool]                Cwi---C---   4.01g                              0.00   12.99  0.00     pool_cdata(0)                                writeback cleaner
  [pool_cdata]          Cwi-ao----   4.01g                                                     /dev/sdb2(0),/dev/sdb1(0),/dev/sdf2(0)
  [pool_cmeta]          ewi-ao----  12.00m                                                     /dev/sdb2(342),/dev/sdb1(342),/dev/sdf2(342)
Comment 11 errata-xmlrpc 2015-11-19 12:47:24 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-2015-2147.html
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