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

[su liu]

Yes! I have tried it and succeeded.


Clustered LVM can take snapshot only on exclusively lock mode.



2016-12-06 16:23 GMT+08:00 Ulrich Windl <Ulrich.Windl at rz.uni-regensburg.de>:

> >>> su liu <liusu8788 at gmail.com> schrieb am 06.12.2016 um 02:16 in
> Nachricht
> <CAN2gjWR_nSOGeZoc7RK_6WicA2L=KM_1=Ar9K5--qi7q3vFffw at mail.gmail.com>:
> > *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。*
>
> Did you try "vgchange -a e ..."?
>
> >
> >
> > 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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