[Ocfs2-users] ocfs2 fencing with multipath and dual channel HBA

[Sunil Mushran]

florian.engelmann at bt.com wrote:
> We tried to use ocfs2 with Vserver clustered with Heartbeat. But
> Vservers need barrier=1. That did not work on our shared storage with
> ocfs2 but I guess this is no ocfs2 problem it is a device mapper problem
> because we need to use multipath and LVM2, isn't it?
> Device mapper does not support barriers, doesn't it?
>   

Yes, ocfs2 has support for barrier. Last I checked, dm does not.

> So the only way we could do it is to disable multipathing for one shared
> storage LUN and mount only one path!?
>
> Is there any better solution?
>