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Bug 1805462

Summary: add a note to "mirrored cache device" of lvmcache(7) that old mirror segtypes are not allowed for dm-cache and dm-writecache origins or pools
Product: Red Hat Enterprise Linux 8 Reporter: Corey Marthaler <cmarthal>
Component: lvm2Assignee: Jonathan Earl Brassow <jbrassow>
lvm2 sub component: Cache Logical Volumes QA Contact: cluster-qe <cluster-qe>
Status: CLOSED ERRATA Docs Contact:
Severity: low    
Priority: unspecified CC: agk, heinzm, jbrassow, mcsontos, msnitzer, pasik, prajnoha, rbednar, rhandlin, zkabelac
Version: 8.2Flags: pm-rhel: mirror+
Target Milestone: rc   
Target Release: 8.0   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: lvm2-2.03.09-2.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-04 02:00:25 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:
Attachments:
Description Flags
patch none

Description Corey Marthaler 2020-02-20 20:17:20 UTC 
Description of problem:
Current Section: 

   mirrored cache device

       The fast LV holding the cache can be created as a raid1 mirror so that it can tolerate a device failure.  (When using dm-cache with separate data and metadata LVs, each of the sub-LVs can use raid1.)

       $ lvcreate -n main -L Size vg /dev/slow
       $ lvcreate --type raid1 -m 1 -n fast -L Size vg /dev/ssd1 /dev/ssd2
       $ lvconvert --type cache --cachevol fast vg/main




"Old" mirror doesn't work for dm-cache or dm-write cache

# dm-cache
[root@hayes-02 ~]# lvconvert --yes --type cache --cachepool cache_sanity/poolm cache_sanity/originl
  LV cache_sanity/poolm with type mirror cannot be converted to a cache pool.
[root@hayes-02 ~]# lvconvert --yes --type cache --cachepool cache_sanity/pooll cache_sanity/originm
  Command on LV cache_sanity/originm does not accept LV type mirror.
  Command not permitted on LV cache_sanity/originm.

# dm-writecache
[root@hayes-02 ~]# lvconvert --yes --type writecache --cachevol cache_sanity/pooll cache_sanity/originm
  Command on LV cache_sanity/originm does not accept LV type mirror.
  Command not permitted on LV cache_sanity/originm.
[root@hayes-02 ~]# lvconvert --yes --type writecache --cachevol cache_sanity/poolm cache_sanity/originl
  LV cache_sanity/poolm must be linear to use as a writecache.


Version-Release number of selected component (if applicable):
kernel-4.18.0-179.el8    BUILT: Fri Feb 14 17:03:01 CST 2020
lvm2-2.03.08-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
lvm2-libs-2.03.08-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
lvm2-dbusd-2.03.08-1.el8    BUILT: Tue Feb 11 07:42:51 CST 2020
lvm2-lockd-2.03.08-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
boom-boot-1.0-1.el8    BUILT: Fri Nov 29 05:18:30 CST 2019
device-mapper-1.02.169-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
device-mapper-libs-1.02.169-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
device-mapper-event-1.02.169-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
device-mapper-event-libs-1.02.169-1.el8    BUILT: Tue Feb 11 07:40:33 CST 2020
Comment 1 Jonathan Earl Brassow 2020-02-27 17:16:49 UTC 
Created attachment 1666262 [details]
patch
Comment 2 Jonathan Earl Brassow 2020-03-10 22:23:50 UTC 
commit c392ccaa470dbf1481cbf1c9e899ce9c59f2caea
Author: Jonathan Brassow <jbrassow>
Date:   Thu Feb 27 11:33:55 2020 -0600

in mainline.
Comment 3 Roman Bednář 2020-04-14 07:33:45 UTC 
Adding QA ack for 8.3
Comment 6 Corey Marthaler 2020-06-11 03:42:03 UTC 
Fix verified in the latest rpms.

kernel-4.18.0-211.el8    BUILT: Thu Jun  4 03:33:39 CDT 2020
lvm2-2.03.09-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
lvm2-libs-2.03.09-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
lvm2-dbusd-2.03.09-2.el8    BUILT: Fri May 29 11:32:49 CDT 2020
lvm2-lockd-2.03.09-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
boom-boot-1.1-1.el8    BUILT: Thu May 14 08:11:56 CDT 2020
device-mapper-1.02.171-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
device-mapper-libs-1.02.171-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
device-mapper-event-1.02.171-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020
device-mapper-event-libs-1.02.171-2.el8    BUILT: Fri May 29 11:29:58 CDT 2020


   RAID1 cache device

       RAID1  can be used to create the fast LV holding the cache so that it can tolerate a device failure.  (When using dm-cache with separate data and metadata LVs, each of the
       sub-LVs can use RAID1.)

       $ lvcreate -n main -L Size vg /dev/slow
       $ lvcreate --type raid1 -m 1 -n fast -L Size vg /dev/ssd1 /dev/ssd2
       $ lvconvert --type cache --cachevol fast vg/main
Comment 9 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