[Ocfs2-users] CDSL .vs. Bind mounts?

[John McNulty]

I'm puzzled.  Coming from a Tru64/TruCluster background I know CDSL's  
well, but have never used bind mounts.  From reading about them it  
looks to me like:

     a CDSL = [one] file that points to [many] files, but
     a bind mount = [many] mount points that originate from [one]

Not only is the one to many relationship of a bind mount the opposite  
of a CDSL, but it's not possible to replace  [for example] a CDSL  
like /etc/application.conf by mounting something on top of it.

How is this supposed to work?

Rgds,

John

On 17 Sep 2009, at 16:33, David Johle wrote:

> At 02:00 PM 5/5/2009, ocfs2-users-request at oracle.com wrote:
>>        The mainline linux kernel developers have decided that CDSLs  
>> are
>> not something they will accept.  As such, ocfs2 in mainline does not
>> support them, and production ocfs2 1.4 and later do not either.
>>        The recommended solution from the kernel developers is bind
>> mounts.  You can set those up on your own system via startup scripts.
>>
>> Joel Becker
>> Principal Software Developer
>> Oracle
>> E-mail: joel.becker at oracle.com
>> Phone: (650) 506-8127
>
>
> So here I am once again trying to eliminate the use of CDSLs so that
> I can upgrade past 1.2.x, and I'm finding myself stuck.
>
> I have made use of bind mounts for entire directories that were
> node-specific via CDSL.  However, I have yet to find an alternative
> for a CDSL that points at a single file.  I've been re-working
> applications configs and all to reduce depency on CDSL and/or bind
> mounts, but I've gotten down to only TWO files left which use a
> CDSL.  And, due to the nature of the application and configuration
> file I cannot figure a way around the CDSL.
>
> Has anyone else gone through this process of getting away from
> specific file CDSLs?  If so, what did you do?
>
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