Dear Ashish, thank you very much for your support. I think that I’m not able to change the volume configuration for the reason you mentioned at the end of your n.1 answer. GNFS mount is a very good idea, thank you!!! I will use it in my action plan.
I’m very happy to have been helped by you (Ashish and Serkan). Regards, Mauro > Il giorno 07 giu 2018, alle ore 16:49, Ashish Pandey <[email protected]> ha > scritto: > > Mauro, > > Your plan looks fine to me. However, I would like to add few points. > > 1 - After adding 3 more nodes you will have overall 6 nodes. It would be > better if you can have 1 brick on each server for any EC subvolume. > For example: for 4+2, all 6 bricks should be on different nodes. This > will help you to have better redundancy. For example even if 2 nodes go down, > you will still have 4 good bricks. > In your existing setup, if 2 nodes go down you will loose 4 bricks which > will make the volume unusable. > Although it would be tricky to do so, as you have older version on 3 > nodes and newer on 3 nodes. > > 2 - In your plan, if you can use gnfs mount, you could easily copy the data > from one volume to other. In this case the client would be running on one of > the server which would be same as the server version. > > 3 - The plan you mentioned will also work. However, you have to have *older* > client version on third machine on which you are going to mount both volumes. > > 4 - The plan which Serkan mentioned is also a feasible plan specially if IO's > are not going on. However, just keep the first point in your mind and see if > you can reach to that setup. > > --- > Ashish > > > > > > From: "Serkan Çoban" <[email protected]> > To: "Mauro Tridici" <[email protected]> > Cc: "Gluster Users" <[email protected]> > Sent: Thursday, June 7, 2018 7:19:50 PM > Subject: Re: [Gluster-users] Expanding a distributed disperse volume: some > questions about the action plan > > >in order to copy the data from the old volume to the new one, I need a third > >machine that can mount both the volumes; it's possible? if yes, which > >gluster client version should I use/install on the "bridge" machine? > Yes it is possible, you need to install old client version to bridge > server, old clients can talk to new servers > > Why not just extend the old cluster & rebalance and then upgrade to > latest version of glusterfs? > > On Thu, Jun 7, 2018 at 3:18 PM, Mauro Tridici <[email protected]> wrote: > > Dear Users, > > > > just one year ago, we implemented a tier2 storage based on GlusterFS > > v.3.10.5 and we can say that it works like a charm. > > The GlusterFS volume has been created using 3 physical servers (each server > > contains 12 disks, 1 brick per disk). > > > > Below, you can find some information about the gluster volume type > > > > Volume Name: tier2 > > Type: Distributed-Disperse > > Volume ID: a28d88c5-3295-4e35-98d4-210b3af9358c > > Status: Started > > Snapshot Count: 0 > > Number of Bricks: 6 x (4 + 2) = 36 > > Transport-type: tcp > > > > Now, it's time to expand this volume so we bought 3 new servers similar to > > the 3 existing servers. Since we would like to upgrade the Gluster version > > to last available one, we would like to know if the following action plan is > > correct and safe: > > > > 1) creation of a new gluster distributed disperse volume (6x(4+2)) using the > > 3 new servers and the new gluster version; > > 2) copy of all the data saved on the old gluster volume to the new one; > > 3) complete erasure of three old servers operating system; > > 4) installation of the last available version of the operating system and > > glusterfs software stack on the three old servers; > > 5) expansion of the volume (created at point nr.1) adding the new bricks > > (created at point nr.4) > > > > If our action plan can be considered "validated", I have an other question: > > > > - in order to copy the data from the old volume to the new one, I need a > > third machine that can mount both the volumes; it's possible? if yes, which > > gluster client version should I use/install on the "bridge" machine? > > > > Thank you very much for your attention. > > Regards, > > Mauro > > > > > > _______________________________________________ > > Gluster-users mailing list > > [email protected] > > 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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