[Ocfs2-users] Versions and features

[Werner Flamme]

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Joel Becker [28.02.2011 18:10]:
> On Mon, Feb 28, 2011 at 02:07:16PM +0100, Werner Flamme wrote:
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>> Hi all,
>>
>> last Friday my colleague (using Oracle's Linux 5) und me tried to get
>> access to a shared OCFS2 volume. Since he claimed that he now has OCFS2
>> 1.6, and I only have 1.4.3 (list below), we decided that I create the
>> filesystem with --fs-feature-level=max-features.
> 
> 	If you want to share among differing versions, you want
> --fs-feature-level=max-compat.  max-features means "select the newest
> features", which will be incompatible with ocfs2 1.4.
> 
> Joel

Joel,

I see that. I used --fs-feature-level=max-features this because I
thought that my colleague has a newer version that I have and that he
will be able to "consume" all features that my old mkfs.ocfs2 is able to
activate. He was not.

I know --fs-feature-level=max-compat. That's what I used to get both
machines to mount the volumes. But I still want to know which features
are available at both of our installations: which features are available
for his Oracle Linux 5.something? Which features are available for my
SLES 11 SP 1? How do I know that? --fs-feature-level=max-compat turns
off a lot of useful features (e.g. sparse), that is unnecessary to turn
off because both machines can handle it. I want to know the features
both OS' have in common, so that I can choose the right subset of
available features when creating a filesystem.

Regards,
Werner
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