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Bug 1805898 - allow writecache to be removed from an active LV
Summary: allow writecache to be removed from an active LV
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: lvm2
Version: 8.4
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.0
Assignee: David Teigland
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-02-21 17:17 UTC by David Teigland
Modified: 2021-09-07 11:51 UTC (History)
9 users (show)

Fixed In Version: lvm2-2.03.09-3.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 02:00:25 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:4546 0 None None None 2020-11-04 02:00:42 UTC

Description David Teigland 2020-02-21 17:17:36 UTC 
Description of problem:

Currently the LV must be inactive before lvconvert --splitcache|--uncache can be used.

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


How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 2 David Teigland 2020-06-10 17:36:21 UTC 
pushed to master:
https://sourceware.org/git/?p=lvm2.git;a=commit;h=240062a18365a7f6725ebcf1b035a6e0a3b12803
Comment 5 Corey Marthaler 2020-07-20 22:10:13 UTC 
Fix verified in the latest rpms.

kernel-4.18.0-215.el8    BUILT: Tue Jun 16 14:14:53 CDT 2020
lvm2-2.03.09-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020
lvm2-libs-2.03.09-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020
lvm2-dbusd-2.03.09-3.el8    BUILT: Mon Jun 29 13:53:38 CDT 2020
device-mapper-1.02.171-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020
device-mapper-libs-1.02.171-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020
device-mapper-event-1.02.171-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020
device-mapper-event-libs-1.02.171-3.el8    BUILT: Mon Jun 29 13:50:23 CDT 2020



[root@hayes-01 ~]# lvcreate --wipesignatures y  -L 4G -n split_cache writecache_sanity @slow
  Logical volume "split_cache" created.
[root@hayes-01 ~]# lvcreate --wipesignatures y  -L 4G -n un_cache writecache_sanity @slow
  Logical volume "un_cache" created.
[root@hayes-01 ~]# lvcreate  -L 4G -n pool1 writecache_sanity @fast
  Logical volume "pool1" created.
[root@hayes-01 ~]# lvcreate  -L 4G -n pool2 writecache_sanity @fast
  Logical volume "pool2" created.

[root@hayes-01 ~]# lvchange -an writecache_sanity/pool1  writecache_sanity/pool2
[root@hayes-01 ~]# lvconvert --yes --type writecache --cachevol writecache_sanity/pool1 writecache_sanity/split_cache
  Using writecache block size 512 for unknown file system block size, logical block size 512, physical block size 512.
  Logical volume writecache_sanity/split_cache now has writecache.
[root@hayes-01 ~]# lvconvert --yes --type writecache --cachevol writecache_sanity/pool2 writecache_sanity/un_cache
  Using writecache block size 512 for unknown file system block size, logical block size 512, physical block size 512.
  Logical volume writecache_sanity/un_cache now has writecache.
[root@hayes-01 ~]# lvs -a -o +devices,segtype
  LV                   VG                Attr       LSize Pool         Origin               Data%  Meta%  Move Log Cpy%Sync Convert Devices               Type      
  [pool1_cvol]         writecache_sanity Cwi-aoC--- 4.00g                                                                           /dev/sdi1(0)          linear    
  [pool2_cvol]         writecache_sanity Cwi-aoC--- 4.00g                                                                           /dev/sdi1(1024)       linear    
  split_cache          writecache_sanity Cwi-a-C--- 4.00g [pool1_cvol] [split_cache_wcorig] 0.00                                    split_cache_wcorig(0) writecache
  [split_cache_wcorig] writecache_sanity owi-aoC--- 4.00g                                                                           /dev/sdh1(0)          linear    
  un_cache             writecache_sanity Cwi-a-C--- 4.00g [pool2_cvol] [un_cache_wcorig]    0.00                                    un_cache_wcorig(0)    writecache
  [un_cache_wcorig]    writecache_sanity owi-aoC--- 4.00g                                                                           /dev/sdh1(1024)       linear    


# active splitcache
[root@hayes-01 ~]# lvconvert --splitcache writecache_sanity/split_cache
  Logical volume writecache_sanity/split_cache writecache has been detached.

# active uncache
[root@hayes-01 ~]# lvconvert --uncache writecache_sanity/un_cache
  Logical volume writecache_sanity/un_cache writecache has been detached.
  Logical volume "pool2" successfully removed

[root@hayes-01 ~]# lvs -a -o +devices,segtype
  LV          VG                Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices         Type  
  pool1       writecache_sanity -wi------- 4.00g                                                     /dev/sdi1(0)    linear
  split_cache writecache_sanity -wi-a----- 4.00g                                                     /dev/sdh1(0)    linear
  un_cache    writecache_sanity -wi-a----- 4.00g                                                     /dev/sdh1(1024) linear
Comment 8 errata-xmlrpc 2020-11-04 02:00:25 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 (lvm2 bug fix and enhancement update), 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-2020:4546
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