Phil Dickens wrote:

> 
> Hello,
> 
>  I am new to this group and I apologize if these issues have
> already been addressed. I am somewhat confused about what is
> or is not supported in terms of locking, and any help would
> be greatly appreciated!
> 
>  1) Is fcntl currently supported?

Yes, it works, but see e.g. here 
https://bugzilla.lustre.org/show_bug.cgi?id=12542
https://bugzilla.lustre.org/show_bug.cgi?id=12802

> 2) Can locking be disabled on a per file basis?

I don't think so.

> 3) Can client-side caching be disabled on a per file basis?

I don't think so.

> 4) Is O_DIRECT supported at the application level?

Works for me.


Cheers,
Bernd

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