[Ocfs2-tools-devel] [PATCH] Option to skip cluster checking in tunefs.ocfs2

[Joel Becker]

On Tue, Oct 20, 2009 at 02:01:16PM -0700, Joel Becker wrote:
> On Tue, Oct 20, 2009 at 10:29:17PM +0200, Lars Marowsky-Bree wrote:
> > Some admins may prefer to make changes to an OCFS2 mount in a
> > virtualized environment too (ie, modifying the fs on Dom0 while the
> > DomUs are stopped).
> 
> 	*This* is a logical use case that requires some thought.  Of
> course, you could just bring up a domU.

	I take it back.  This runs into a host of problems.  First, of
course, is the high likelyhood of getting it wrong.  If this is a habit,
not an exceptional thing, then it is likely you'll forget a mounted node
at some point.  And since you *have* to run in --force mode, you'll
always run that way without checking.
	Secondly, there's the question of mapping devices.  Your ocfs2
is probably a partition in a disk image.  So making it visible to dom0
takes some work to get right.
	Finally, Sunil points out that if we allow tune, people will
expect to also mount it from dom0 to make other modifications.  The only
way to do that is to bring up the cluster.  And then they have a cluster
configuration for tune.
	It's very analogous to trying to modify a LUN from a SAN array
rather than from the client.

Joel

-- 

"The first thing we do, let's kill all the lawyers."
                                        -Henry VI, IV:ii

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127