Dear Ashish, thank you very much for the information and for the provided examples. They really help.
I think that it may be useful to stick a label on each server in order to identify the group they belong to. For example: server n.01 (label: Group 01) server n.02 (label: Group 01) server n.03 (label: Group 01) server n.04 (label: Group 02) server n.05 (label: Group 02) server n.06 (label: Group 02) So, if server n.01 and server n.06 go down I know that there will be no problem for the data. But, if server n.05 and n.06 go down, I can start to cry. Thank you again, Mauro Tridici > Il giorno 20 set 2017, alle ore 09:33, Ashish Pandey <[email protected]> ha > scritto: > > > After adding 3 more nodes you will have 6 nodes and 2 HD on each nodes. > It depends on the way you are going to add new bricks on the existing volume > 'vol" > I think you should remember that in a given EC sub volume of 4+2, at any > point of time 2 bricks could be down. > When you make 6 * (4+2) to 12 * (4+2) you have to provide path of the bricks > you want to add. > > Suppose you want to add 6 bricks and all the 6 bricks are on 3 new nodes (2 > each) then with respect to that sub volume you can tolerate 1 node going > down. > If you are creating a 12 * (4+2) volume from the scratch and providing 12 > bricks from each server then in that case even 2 nodes can go down without > any issue. > > I think You should focus more on the number of Hard Drive in a sub volume. > You should ask yourself "How many bricks (HD) with in a sub volume will be > unavailable if 1 or 2 nodes are going down?" > > Ashish > > > > > From: "Mauro Tridici" <[email protected]> > To: [email protected] > Sent: Tuesday, September 19, 2017 1:09:06 AM > Subject: [Gluster-users] how many hosts could be down in a 12x(4+2) > distributed dispersed volume? > > Dear All, > > I just implemented a (6x(4+2)) DISTRIBUTED DISPERSED gluster (v.3.10) volume > based on the following hardware: > > - 3 gluster servers (each server with 2 CPU 10 cores, 64GB RAM, 12 hard disk > SAS 12Gb/s, 10GbE storage network) > > Now, we need to add 3 new servers with the same hardware configuration > respecting the current volume topology. > > > My question is: in the current volume configuration, only 2 bricks per > subvolume or one host could be down without losing data. What it will happen > in the next configuration? How many hosts could be down without losing data? > > Thank you very much. > Mauro Tridici > > _______________________________________________ > Gluster-users mailing list > [email protected] > http://lists.gluster.org/mailman/listinfo/gluster-users > ------------------------- Mauro Tridici Fondazione CMCC CMCC Supercomputing Center presso Complesso Ecotekne - Università del Salento - Strada Prov.le Lecce - Monteroni sn 73100 Lecce IT http://www.cmcc.it mobile: (+39) 327 5630841 email: [email protected]
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