Ok, I think I see my error. The rule, near as I can tell, is actually total/parity>2. So, 4+2 gives 6/2=3, and therefore is ok. Eventually I’ll get all this straight!
Terry > On Mar 30, 2017, at 23:13, Ashish Pandey <[email protected]> wrote: > > Terry, > > It is (data/parity)>=2. You can very well create 4+2 or 8+4 volume. > Are you seeing any error message that you can not create 4+2 config? (4 = > data brick and 2 = redundancy brick count) > > Ashish > > From: "Terry McGuire" <[email protected]> > To: [email protected] > Sent: Friday, March 31, 2017 3:34:35 AM > Subject: Re: [Gluster-users] Node count constraints with EC? > > Thanks Ashish, Cedric, for your comments. > > I’m no longer concerned about my choice of 4 nodes to start, but, I realize > that there’s an issue with my subvolume config options. Turns out only my > 8+3 choice is permitted, as the 4+2 and 8+4 options violate the data/parity>2 > rule. So, 8+3 it is, as 8+2 isn’t quite enough redundancy for me. > > Regards, > Terry > > > On Mar 30, 2017, at 02:14, [email protected] <mailto:[email protected]> > wrote: > > On 30/03/2017 08:35, Ashish Pandey wrote: > Good point Cedric!! > The only thing is that, I would prefer to say "bricks" instead of "nodes" in > your statement. > > "starting with 4 bricks (3+1) can only evolve by adding 4 bricks (3+1)" > Oh right, thanks for correcting me ! > > Cheers > > > From: "Cedric Lemarchand" <[email protected]> <mailto:[email protected]> > To: "Terry McGuire" <[email protected]> <mailto:[email protected]> > Cc: [email protected] <mailto:[email protected]> > Sent: Thursday, March 30, 2017 11:57:27 AM > Subject: Re: [Gluster-users] Node count constraints with EC? > > > > Le 29 mars 2017 à 20:29, Terry McGuire <[email protected]> > > <mailto:[email protected]> a écrit : > > > > I was thinking I’d spread these over 4 nodes, and add single nodes over > > time, with subvolumes rearranged over new nodes to maintain protection from > > whole node failures. > > Also keep in mind that dispersed cluster can only be expanded by the number > of initial nodes, eg starting with 4 nodes 3+1 can only evolve by adding 4 > nodes 3+1, you cannot change the default policy 3+1 to 4+1. So the > granularity of the evolution of the cluster is fixed at the beginning. > > Cheers > _______________________________________________ > Gluster-users mailing list > [email protected] <mailto:[email protected]> > http://lists.gluster.org/mailman/listinfo/gluster-users > <http://lists.gluster.org/mailman/listinfo/gluster-users> > > > > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://lists.gluster.org/mailman/listinfo/gluster-users >
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