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 ----- Original Message ----- 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] wrote: On 30/03/2017 08:35, Ashish Pandey wrote: <blockquote> 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 <blockquote> ----- Original Message ----- From: "Cedric Lemarchand" <[email protected]> To: "Terry McGuire" <[email protected]> Cc: [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]> 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] http://lists.gluster.org/mailman/listinfo/gluster-users </blockquote> </blockquote> _______________________________________________ Gluster-users mailing list [email protected] http://lists.gluster.org/mailman/listinfo/gluster-users
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