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
On 02/11/2016 01:45 AM, Mike Stump 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]It isn't. Consistency, availability, tolerance to network partitions. You get to pick any two.> 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 > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://www.gluster.org/mailman/listinfo/gluster-users
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 >_______________________________________________ >Gluster-users mailing list >Gluster-users at gluster.org >http://www.gluster.org/mailman/listinfo/gluster-users-- Sent from my Android device with K-9 Mail. Please excuse my brevity. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.gluster.org/pipermail/gluster-users/attachments/20160212/748da43d/attachment.html>