[Gluster-users] HA replica

Joe Julian
Fri, 12 Feb 2016 16:46:49 -0000

As Ravi mentions, in computer science there's a concept known as CAP theory
( https://en.m.wikipedia.org/wiki/CAP_theorem ) that states what Ravi says.

Nothing is HA if you do it wrong, and there's lots of ways to do HA wrong.
Rather than getting emotional and blaming a tool for not meeting your
expectation, consider asking for help achieving your goals. You'll learn a
lot more and you'll more likely reach your goals.

On February 10, 2016 12:15:26 PM PST, Mike Stump <mikestump at
comcast.net> wrote:
>Could please state directly in the docs that replica isn?t useful to
>make reliable R/W HA filesystems.  There are a ton of web pages that
>suggest that gluster can be used to make HA filesystems, but that is
>false.[1]  To a normal person replica 2 means that it works when one
>goes offline.  The problem is, if you configure quorums to avoid split
>brain, because you want a filesystem that works, then when the first
>replica pair goes offline, you get read-only errors on the filesystem.
>In the HA world, falling over dead, isn?t what people want.  Not
>configuring a quorum is even worse, as then it isn?t even a reliable
>filesystem.
>
>
>Also, please state that by default, because of the quorum setting, the
>filesystem isn?t reliable when replica is used.
>
>
>Personally, I?d like a reliable high performance HA filesystem.  I was
>hoping that gluster could be it.
>
>
>1 -
>https://www.gluster.org/pipermail/gluster-users/2015-July/022843.html
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