[Gluster-users] Node count constraints with EC?

Terry McGuire
Thu, 30 Mar 2017 22:04:35 -0000

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, yipikai7 at gmail.com 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" <yipikai7 at gmail.com>
<mailto:yipikai7 at gmail.com>
>> To: "Terry McGuire" <tmcguire at ualberta.ca>
<mailto:tmcguire at ualberta.ca>
>> Cc: gluster-users at gluster.org <mailto:gluster-users at
gluster.org>
>> Sent: Thursday, March 30, 2017 11:57:27 AM
>> Subject: Re: [Gluster-users] Node count constraints with EC?
>>
>>
>> > Le 29 mars 2017 ? 20:29, Terry McGuire <tmcguire at
ualberta.ca> <mailto:tmcguire at ualberta.ca> a ?crit :
>> >
>> > 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
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>

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