[Info-vax] New filesystem mentioned

[Dave Froble]

On 5/14/2019 8:21 AM, Simon Clubley wrote:
> 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.
>

I don't know how a "plug-in" filesystem works, but for the rest of the 
comments, all I can say is "ayep".

:-)

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David Froble                       Tel: 724-529-0450
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