[Info-vax] VMS - The new file system. What do we know about it?...

[Jan-Erik Soderholm]

Den 2016-11-11 kl. 06:50, skrev IanD:
> Is it time for some more information to trickle through about the new
> file system?
>
> I listened to the chat put up by the Progress software folks and there
> was some light chatter that let slip a few more details about it's
> performance
>
> I'm still curious about the new file system
>
> What else can be let loose about it?
>

There were some talks at the meeting at IKEA IT HQ.
This is as I remember it...

> - Will existing RMS work with it?

Yes, the goal is that RMS will work as it is. No RMS re-work
planned as I understand (in regard to the new file system).

The structures that goes from 32 to 64 bits are those that
are below RMS, so to speak. Something was mentioned as an
example of a limit that will not change due to this, but I
do not remember what it was. Hm, maybe it was the maximum
size of any single individual file? Yes, I think it was...
1 TB it is, right?

So I guess that if/when you have these larger volumes, you
cannot any longer take full backups as disk backup savesets.


>
> - Will VSI release any of the development tools / utilities used for
> testing / creating this file system to the public? (I'm asking because
> these types of tools/utilities can help other create extensions)
>

They sticked to the roadmap, first parts released in VMS 8.next in
H2 2017. This is a partial release. Full release in VMS 9.0 on
Itanium and x86-64. No Alpha back-port.

> - Does it working across volumes? (i.e. sharding like abilities)

Do you mean VMS "volume sets"? No, it will not. But a volume as
seen by VMS can of course be made up of multiple "disks" on
some SAN, just as today.

>
> - I understand that it's being revamped to 64 bit internals, what are
> the limits (i.e. How does it compare to this list/ What's similar on
> this list?)

There was some figure mentioned on the new maximum volume size, but
I do not remember the prefix, a couple of steps above "tera" or
something.

>
> - Apart from performance, what other nice things come with it? Better
> security? snapshots ability? etc etc etc?

It is a "log based file system". It can be used at the same time
as ODS-2 and ODS-5 just as they can be used together today. Name
was not decided (as I understood), but ODS-6 was mentioned.

The directory structure will be a "binary tree" instead of the
current sequential structure on ODS-2/5. Gives faster directory
operations.

Directories will still be seen as files.




>
> https://en.wikipedia.org/wiki/Comparison_of_file_systems
>
> Where is there more information about this new toy other than the VSI
> roadmap document?
>