[Info-vax] New filesystem mentioned

[Simon Clubley]

On 2019-05-14, John Reagan <xyzzy1959 at gmail.com> wrote:
> You seem to keep forgetting about shared access to the allocation bitmap,
> shared accesses to files, etc.  Sure, any node can $QIO to any block #, but
> the file system uses locks to synchronize across cluster nodes.  I searched
> the XQP listings for calls to $ENQ and found at least 50 of them.

Yes, but those are all filesystem driver issues. I don't see what is
required in the on-disk structure itself to support VMS style clustering.

As far as I can see, if VMS had a plug-in filesystem architecture, then
there is no conceptual reason why you couldn't have a FAT32 filesystem
(for example) on VMS that was fully cluster aware and which would
continue to be fully operational after a cluster state transition.

All it would need is for rules to be published in the filesystem
driver writing documentation about how to make your filesystem driver
cluster aware.

Simon.

-- 
Simon Clubley, clubley at remove_me.eisner.decus.org-Earth.UFP
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