[Gluster-users] HA replica

Joe Julian joe at julianfamily.org
Fri Feb 12 16:46:49 UTC 2016

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
>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 -
>Gluster-users mailing list
>Gluster-users at gluster.org

Sent from my Android device with K-9 Mail. Please excuse my brevity.
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