[ClusterLabs] [pacemaker+ clvm] Cluster lvm must be active exclusively to create snapshot
su liu
liusu8788 at gmail.com
Mon Dec 5 21:10:44 EST 2016
Thanks for your replay, This snapshot factor will seriously affect my
application.
then, because now I have not a stonith device and I want to verify the
basic process of snapshot a clustered LV.
I have a more question:
After I create a VG: cinder-volumes on controller node, I can see it
throuth vgs command on both controller and compute
1 nodes. then i create a LV:volume-1b0ea468-37c8-4b47-a6fa-6cce65b068b5.
Then I execute the lvs command on both nodes:
[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 controller ~]#
[root at controller ~]#
[root at controller ~]#
[root at controller ~]# ll /dev/cinder-volumes/
total 0
lrwxrwxrwx 1 root root 7 Dec 5 21:29
volume-1b0ea468-37c8-4b47-a6fa-6cce65b068b5 -> ../dm-0
[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
[root at compute1 ~]#
[root at compute1 ~]#
[root at compute1 ~]# ll /dev/cinder-volumes
ls: cannot access /dev/cinder-volumes: No such file or directory
[root at compute1 ~]#
But it seems that the LV can't be exist on the compute1 node. My question
is that how to access the LV on the compute1 node?
thanks very much!
2016-12-06 9:26 GMT+08:00 Digimer <lists at alteeve.ca>:
> On 05/12/16 08:16 PM, su liu wrote:
> > *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
> > *
> > *
>
> You need to configure and enable (and test!) stonith. This is doubly-so
> with clustered LVM/shared storage.
>
> > *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。*
>
> This is how it works. You can't snapshot a clustered LV, as the error
> indicates. The process is ACTIVE -> deactivate on all node -> set
> exclusive on one node -> set it back to ACTIVE, then you can snapshot.
>
> It's not very practical, unfortunately.
>
> > 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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>
> --
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