[ClusterLabs] [pacemaker+ clvm] Cluster lvm must be active exclusively to create snapshot

[su liu]

*Hi all,*


*I am new to pacemaker and I have some questions about the clvmd +
pacemaker + corosync. I wish you could explain it for me if you are free.
thank you very much!*
*I have 2 nodes and the pacemaker's status is as follows:*

[root at controller ~]# pcs status --full
Cluster name: mycluster
Last updated: Mon Dec  5 18:15:12 2016        Last change: Fri Dec  2
15:01:03 2016 by root via cibadmin on compute1
Stack: corosync
Current DC: compute1 (2) (version 1.1.13-10.el7_2.4-44eb2dd) - partition
with quorum
2 nodes and 4 resources configured

Online: [ compute1 (2) controller (1) ]

Full list of resources:

 Clone Set: dlm-clone [dlm]
     dlm    (ocf::pacemaker:controld):    Started compute1
     dlm    (ocf::pacemaker:controld):    Started controller
     Started: [ compute1 controller ]
 Clone Set: clvmd-clone [clvmd]
     clvmd    (ocf::heartbeat:clvm):    Started compute1
     clvmd    (ocf::heartbeat:clvm):    Started controller
     Started: [ compute1 controller ]

Node Attributes:
* Node compute1 (2):
* Node controller (1):

Migration Summary:
* Node compute1 (2):
* Node controller (1):

PCSD Status:
  controller: Online
  compute1: Online

Daemon Status:
  corosync: active/disabled
  pacemaker: active/disabled
  pcsd: active/enabled



*I create a lvm on controller node and it can be seen on the compute1
node immediately with 'lvs' command. but the lvm it not activate on
compute1.*
*then i want to create a snapshot of the lvm, but failed with the error
message:*



*### volume-4fad87bb-3d4c-4a96-bef1-8799980050d1 must be active exclusively
to create snapshot ###*
*Can someone tell me how to snapshot a lvm in the cluster lvm environment？
thank you very much。*


Additional information:

[root at controller ~]# vgdisplay
  --- Volume group ---
  VG Name               cinder-volumes
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  19
  VG Access             read/write
  VG Status             resizable
  Clustered             yes
  Shared                no
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               1000.00 GiB
  PE Size               4.00 MiB
  Total PE              255999
  Alloc PE / Size       256 / 1.00 GiB
  Free  PE / Size       255743 / 999.00 GiB
  VG UUID               aLamHi-mMcI-2NsC-Spjm-QWZr-MzHx-pPYSTt

[root at controller ~]# rpm -qa |grep pacem
pacemaker-cli-1.1.13-10.el7_2.4.x86_64
pacemaker-libs-1.1.13-10.el7_2.4.x86_64
pacemaker-1.1.13-10.el7_2.4.x86_64
pacemaker-cluster-libs-1.1.13-10.el7_2.4.x86_64


[root at controller ~]# lvs
  LV                                          VG             Attr
LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  volume-1b0ea468-37c8-4b47-a6fa-6cce65b068b5 cinder-volumes -wi-a-----
1.00g


[root at compute1 ~]# lvs
  LV                                          VG             Attr
LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  volume-1b0ea468-37c8-4b47-a6fa-6cce65b068b5 cinder-volumes -wi-------
1.00g


thank you very much!
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