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Bug 1691095 - remove cluster mirror capability
Summary: remove cluster mirror capability
Keywords:
Status: POST
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: lvm2
Version: 8.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.1
Assignee: LVM and device-mapper development team
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-03-20 20:46 UTC by David Teigland
Modified: 2019-04-04 18:44 UTC (History)
7 users (show)

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Type: Bug
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Description David Teigland 2019-03-20 20:46:58 UTC
Description of problem:

The cluster mirror (cmirror) capability is not functional in RHEL8 because it depended on clvmd which has been replaced by lvmlockd.  LVM should prevent a mirror LV from being activated concurrently on multiple nodes in a cluster.  LVM will require a mirror LV to be activated exclusively (on a single node.)  If the mirror LV is converted to a linear LV, then it can be activated on multiple nodes using lvmlockd.

The cmirrord daemon can also be removed since it will no longer be used.

Users of cmirror should contact us for more information or help.

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Comment 2 David Teigland 2019-04-03 21:55:20 UTC
pvmove depends on mirroring, so pvmove will not work while an LV is active on multiple nodes (which would require cmirror).  To use pvmove, activate the LV exclusively on a single node.


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