[Gluster-users] HA replica
ravishankar at redhat.com
Fri Feb 12 16:34:45 UTC 2016
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.
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
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