[Ocfs2-devel] mount existent ocfs2 volume in the local mode without the extra DLM, pacemaker/corosync layers

[Joseph Qi]

Just be curious about this user scenario.
What is "without DLM/cluster environment"?

Thanks,
Joseph

On 2020/4/10 16:36, Gang He wrote:
> Hello Guys,
> 
> Usually, we create a ocfs2 cluster on the top DLM(pacemaker/corosync) with a shared volume.
> but the customers complained they could not mount existent ocfs2 volume in the local mode without DLM/cluster envirnment in backup/restore scenario.
> in this case, the customers want to mount this ocfs2 volume from one node without cluster aware way, sometimes the customers have stoped(uninstalled) the whole cluster before the backup/restore, they just want to access the data from the ocfs2 volume.
> Then, I'd like to add a mount option, e.g. "nocluster" (I feel using "local" option is a little confused for the users, since we have a local mount volume concept).
> If the users use "nocluster" option to mount a ocfs2 volume, the whole mount will not depend on the DLM/cluster related services. they
> will mount the existent ocfs2 volume directly (like local mount) for avoiding setup the cluster stacks.
> The code change is small with my preliminary investigation, the main affected places are mount.ocfs2/mounted.ocfs2 tools and mount process in the ocfs2 kernel modules. 
> 
> Any comments/suggestions? 
> 
> 
> Thanks a lot
> Gang
> 
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