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Type: Bug
Resolution: Unresolved
Priority: Major
Fix Version/s: None
Affects Version/s: rhel-9.5
Component/s: lvm2 / Cache Logical Volumes
Labels:
None

Regression:
No
Severity:
None

Pool Team:

rhel-sst-logical-storage
Sub-System Group:

ssg_filesystems_storage_and_HA

Story Points:
3
Blocked:
False
Blocked Reason:

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Product Documentation Required:
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Preliminary Testing:
None
Test Coverage:
None

Experience:
Architecture:

x86_64

SFDC Cases Counter:
SFDC Cases Open:
SFDC Cases Links:

Planning:
None

First off, when was cache/writecache reduction enabled? I don't believe QE was informed of this feature being enabled. The last I remember was RHEL7 bug 1399292 to ensure that is stayed disabled until further notice. It appears this has been enabled but not tested for all of RHEL9.

## RHEL 9.5
 
kernel-5.14.0-496.el9    BUILT: Mon Aug 12 11:29:40 PM CEST 2024
lvm2-2.03.24-2.el9    BUILT: Wed Aug  7 09:41:45 PM CEST 2024
lvm2-libs-2.03.24-2.el9    BUILT: Wed Aug  7 09:41:45 PM CEST 2024
 
 
[root@virt-009 ~]# lvcreate --yes --activate y -L 4G -n cache_6_7010 cache_6_701 /dev/sde2
  Logical volume "cache_6_7010" created.
[root@virt-009 ~]# lvcreate --yes --activate y -L 1G -n cache_6_7010_fast cache_6_701 /dev/sde1
  Logical volume "cache_6_7010_fast" created.
[root@virt-009 ~]# lvcreate --yes --activate y -L 8M -n cache_6_7010_fast_meta cache_6_701 /dev/sde1
  Logical volume "cache_6_7010_fast_meta" created.
[root@virt-009 ~]# lvconvert --type cache-pool --poolmetadata cache_6_701/cache_6_7010_fast_meta cache_6_701/cache_6_7010_fast --yes
  WARNING: Converting cache_6_701/cache_6_7010_fast and cache_6_701/cache_6_7010_fast_meta to cache pool's data and metadata volumes with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted cache_6_701/cache_6_7010_fast and cache_6_701/cache_6_7010_fast_meta to cache pool.
[root@virt-009 ~]# lvconvert --type cache --cachepool cache_6_701/cache_6_7010_fast cache_6_701/cache_6_7010 --yes
  Logical volume cache_6_701/cache_6_7010 is now cached.
 
[root@virt-009 ~]# lvs
  LV           VG            Attr       LSize  Pool                      Origin               Data%  Meta%  Move Log Cpy%Sync Convert
  cache_6_7010 cache_6_701   Cwi-a-C---  4.00g [cache_6_7010_fast_cpool] [cache_6_7010_corig] 0.09   2.15            0.00            
 
[root@virt-009 ~]# lvreduce -f -l 162 /dev/cache_6_701/cache_6_7010
  No file system found on /dev/cache_6_701/cache_6_7010.
  Size of logical volume cache_6_701/cache_6_7010_corig changed from 4.00 GiB (1024 extents) to 648.00 MiB (162 extents).
  Logical volume cache_6_701/cache_6_7010 successfully resized.
 
[root@virt-009 ~]# lvextend -l 486 /dev/cache_6_701/cache_6_7010
  Size of logical volume cache_6_701/cache_6_7010_corig changed from 648.00 MiB (162 extents) to <1.90 GiB (486 extents).
  Logical volume cache_6_701/cache_6_7010 successfully resized.
 
[root@virt-009 ~]# lvchange -an /dev/cache_6_701/cache_6_7010
  WARNING: Integrity check of metadata for pool cache_6_701/cache_6_7010_fast_cpool failed.
[root@virt-009 ~]# echo $?
0
 
[root@virt-009 ~]# lvchange -ay /dev/cache_6_701/cache_6_7010
  Check of pool cache_6_701/cache_6_7010_fast_cpool failed (status:64). Manual repair required!
[root@virt-009 ~]# echo $?
5
 
[root@virt-009 ~]# lvs -a -o +devices,segtype
  LV                              VG            Attr       LSize  Pool                      Origin               Data%  Meta%  Move Log Cpy%Sync Convert Devices                          Type      
  cache_6_7010                    cache_6_701   Cwi---C--- <1.90g [cache_6_7010_fast_cpool] [cache_6_7010_corig]                                         cache_6_7010_corig(0)            cache     
  [cache_6_7010_corig]            cache_6_701   owi---C--- <1.90g                                                                                        /dev/sde2(0)                     linear    
  [cache_6_7010_fast_cpool]       cache_6_701   Cwi---C---  1.00g                                                                                        cache_6_7010_fast_cpool_cdata(0) cache-pool
  [cache_6_7010_fast_cpool_cdata] cache_6_701   Cwi-------  1.00g                                                                                        /dev/sde1(0)                     linear    
  [cache_6_7010_fast_cpool_cmeta] cache_6_701   ewi-------  8.00m                                                                                        /dev/sde1(256)                   linear    
  [lvol0_pmspare]                 cache_6_701   ewi-------  8.00m                                                                                        /dev/sde3(0)                     linear    
 
 
 
 
 
 
 
## RHEL 9.3
 
kernel-5.14.0-362.24.1.el9_3    BUILT: Thu Feb 15 12:57:51 PM CET 2024
lvm2-2.03.21-3.el9    BUILT: Thu Jul 13 08:50:26 PM CEST 2023
lvm2-libs-2.03.21-3.el9    BUILT: Thu Jul 13 08:50:26 PM CEST 2023
 
 
[root@virt-482 ~]# lvcreate --yes --activate y -L 4G -n cache_6_7010 cache_6_701 /dev/sda
  Logical volume "cache_6_7010" created.
[root@virt-482 ~]# lvcreate --yes --activate y -L 1G -n cache_6_7010_fast cache_6_701 /dev/sdb
  Logical volume "cache_6_7010_fast" created.
[root@virt-482 ~]# lvcreate --yes --activate y -L 8M -n cache_6_7010_fast_meta cache_6_701 /dev/sdb
  Logical volume "cache_6_7010_fast_meta" created.
[root@virt-482 ~]# lvconvert --type cache-pool --poolmetadata cache_6_701/cache_6_7010_fast_meta cache_6_701/cache_6_7010_fast --yes
  WARNING: Converting cache_6_701/cache_6_7010_fast and cache_6_701/cache_6_7010_fast_meta to cache pool's data and metadata volumes with metadata wiping.
  THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)
  Converted cache_6_701/cache_6_7010_fast and cache_6_701/cache_6_7010_fast_meta to cache pool.
[root@virt-482 ~]# lvconvert --type cache --cachepool cache_6_701/cache_6_7010_fast cache_6_701/cache_6_7010 --yes
  Logical volume cache_6_701/cache_6_7010 is now cached.
[root@virt-482 ~]# lvs
  LV           VG            Attr       LSize  Pool                      Origin               Data%  Meta%  Move Log Cpy%Sync Convert
  cache_6_7010 cache_6_701   Cwi-a-C---  4.00g [cache_6_7010_fast_cpool] [cache_6_7010_corig] 0.09   2.15            0.00            
  root         rhel_virt-482 -wi-ao---- <8.00g                                                                                       
  swap         rhel_virt-482 -wi-ao----  1.00g                                                                                       
[root@virt-482 ~]# lvreduce -f -l 162 /dev/cache_6_701/cache_6_7010
  No file system found on /dev/cache_6_701/cache_6_7010.
  Size of logical volume cache_6_701/cache_6_7010_corig changed from 4.00 GiB (1024 extents) to 648.00 MiB (162 extents).
  Logical volume cache_6_701/cache_6_7010 successfully resized.
[root@virt-482 ~]# lvextend -l 486 /dev/cache_6_701/cache_6_7010        
  Size of logical volume cache_6_701/cache_6_7010_corig changed from 648.00 MiB (162 extents) to <1.90 GiB (486 extents).
  Logical volume cache_6_701/cache_6_7010 successfully resized.
[root@virt-482 ~]# lvchange -an /dev/cache_6_701/cache_6_7010
  WARNING: Cannot parse output 'cache_check 1.0.6
' from /usr/sbin/cache_check.
  WARNING: Check is skipped, please upgrade installed version of /usr/sbin/cache_check!
[root@virt-482 ~]# echo $?
0
[root@virt-482 ~]# lvchange -ay /dev/cache_6_701/cache_6_7010
  WARNING: Cannot parse output 'cache_check 1.0.6
' from /usr/sbin/cache_check.
  WARNING: Check is skipped, please upgrade installed version of /usr/sbin/cache_check!
[root@virt-482 ~]# echo $?
0

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