Mailing List Archive: create 2 node cluster with clvm starting with one node

create 2 node cluster with clvm starting with one node

Sep 24, 2015, 5:26 AM

Post #1 of 3 (1383 views)

Hi,

I have to build a 2 node NFS Cluster based on Pacemaker/Corosync. The Volume used for the filesystem that will be exported by NFS is on a shared storage. I would like to use cLVM on this Volume. The challenge is, at the moment just one node is available. That means, I have to create the cluster configuration for a two node cluster by having just one node available.

Is it possible to get cLVM running with just one node? Is this possible by setting quorum policy to ignore?

Is it possible to get cLVM running without enabling Stonith? (as long as i got only one of the two nodes, I'm forced to disable stonith, because the other node is in production).

thank's and kind regards

Sven

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Re: create 2 node cluster with clvm starting with one node [ In reply to ]

arvidjaar at gmail

Sep 24, 2015, 5:34 AM

Post #2 of 3 (1360 views)

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On Thu, Sep 24, 2015 at 3:26 PM, Sven Moeller <smoeller@nichthelfer.de> wrote:
> Hi,
>
> I have to build a 2 node NFS Cluster based on Pacemaker/Corosync. The Volume used for the filesystem that will be exported by NFS is on a shared storage. I would like to use cLVM on this Volume.

Why do you need cLVM in the first place? Will you be using clustered
filesystem that allows concurrent access from both nodes?

> The challenge is, at the moment just one node is available. That means, I have to create the cluster configuration for a two node cluster by having just one node available.
>
> Is it possible to get cLVM running with just one node? Is this possible by setting quorum policy to ignore?
>
> Is it possible to get cLVM running without enabling Stonith? (as long as i got only one of the two nodes, I'm forced to disable stonith, because the other node is in production).
>
> thank's and kind regards
>
> Sven
>
>
> _______________________________________________
> Pacemaker mailing list: Pacemaker@oss.clusterlabs.org
> http://oss.clusterlabs.org/mailman/listinfo/pacemaker
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org

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Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
Bugs: http://bugs.clusterlabs.org

Re: create 2 node cluster with clvm starting with one node [ In reply to ]

smoeller at nichthelfer

Sep 24, 2015, 6:15 AM

Post #3 of 3 (1367 views)

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Am Donnerstag, 24. September 2015 14:34 CEST, Andrei Borzenkov <arvidjaar@gmail.com> schrieb:

> On Thu, Sep 24, 2015 at 3:26 PM, Sven Moeller <smoeller@nichthelfer.de> wrote:
> > Hi,
> >
> > I have to build a 2 node NFS Cluster based on Pacemaker/Corosync. The Volume used for the filesystem that will be exported by NFS is on a shared storage. I would like to use cLVM on this Volume.
>
> Why do you need cLVM in the first place? Will you be using clustered

> filesystem that allows concurrent access from both nodes?
>

No, I don't want to use a clustered filesystem. But I want the cluster to be able to lock the active Volume Group (activate exclusively) so that no concurrent access will be possible by activating the LVM Volume Group manually on different node bypassing the cluster, ending up with 2 times mounted FS on 2 different nodes. I don't like corrupted ext3/4 filesystems ;-)

Beside SCSI Locks or activating a cLVM Volume Gorup exclusively I don't know any mechanism to be sure to not mount a Volume twice on different servers.

Sven

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