[Gluster-devel] YaAQ

[Krishna Srinivas]

On Thu, Apr 10, 2008 at 11:12 AM, Brandon Lamb <brandonlamb at gmail.com> wrote:
> Yet another AFR Question.. ha ha. Im a snowflake...
>
>  Ok so I was just reading the glusterfs.org wiki and there are quite a
>  few new documentations / howtos / examples than previously (very big
>  thank you to whoever has contributed to that).
>
>  It brought up a question, do I need to use unify with AFR? I was
>  reading the "Simple High Availability Storage with GlusterFS 1.3" page
>  and I trying to wrap my head around what the bottom example was doing.
>
>  Oh as I was typing I may have just had an idea, is the unify stuff a
>  way to have 3+ servers but only 2 copies of something? So by default
>  afr would get the number of copies from the number of afr bricks, but
>  by setting it up in the 3 afr bricks and then unified there would only
>  be 3 copies?
>

Unify distributes creation of files on one of its subvols. AFR creates
the file on all its subvols. How you use this is up to you. Yes it will help
the case where there are 3 servers and to have 2 copies of each file.

>  I have a two "server" setup (so two machiens with big raids that i
>  want to mirror). So I dont need to use unify do I? Can I just throw
>  some performance translator stuff above where i define the afr brick
>  and call it good?
>

Correct. Unify is not needed in such cases. Wiki needs to be changed.

Krishna

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