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Re: [Cluster-devel] [PATCH 5/5] gfs2: dlm based recovery coordination



On Mon, Jan 09, 2012 at 04:36:30PM +0000, Steven Whitehouse wrote:
> On Thu, 2012-01-05 at 10:46 -0600, David Teigland wrote:
> > This new method of managing recovery is an alternative to
> > the previous approach of using the userland gfs_controld.
> > 
> > - use dlm slot numbers to assign journal id's
> > - use dlm recovery callbacks to initiate journal recovery
> > - use a dlm lock to determine the first node to mount fs
> > - use a dlm lock to track journals that need recovery
> 
> I've just been looking at this again, and a question springs to mind...
> how does this deal with nodes which are read-only or spectator mounts?
> In the old system we used to propagate that information to gfs_controld
> but I've not spotted anything similar in the patch so far, so I'm
> wondering whether it needs to know that information or not,

The dlm allocates a "slot" for all lockspace members, so spectator mounts
(like readonly mounts) would be given a slot/jid.  In gfs_controld,
spectator mounts are not be given a jid (that came from the time when
adding a journal required extending the device+fs.)  These days, there's
probably no meaningful difference between spectator and readonly mounts.


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