On Wed, Feb 12, 2014 at 11:21 AM, Vijay Bellur <vbellur@xxxxxxxxxx> wrote: > On 02/11/2014 03:21 PM, Antonio Messina wrote: >> So, my guess is that if I create a "replica N" replicated+distributed >> volumes using the bricks: >> >> gluster-1:/srv/gluster >> ... >> gluster-[N*M]:/srv/gluster >> >> gluster internally creates a distributed volumes made of the following >> replicated "volumes": >> >> replicated volume 1: gluster-[1..N]:/srv/gluster >> replicated volume 2: gluster-[N+1..2N]:/srv/gluster >> ... >> replicated volume M: gluster-[N*(M-1)+1..N*M]:/srv/gluster >> >> Is that correct or there is a more complex algorithm involved? >> > > The interpretation is correct. The way replica sets are chosen is related to > the order in which bricks are defined at the time of volume creation. Thank you for your clarification. However, I am also trying to play with the vol files. It's not clear to me yet *when* and *how* these files are read, so I don't know if I am doing something very stupid... however, here is my question: I create a distributed+replicated volume with 4 bricks with: gluster volume create default replica 2 gluster-data00{1,2,3,4}:/srv/gluster/brick force mount the filesystem, created multiple files on it and I have verified that the replicas are stored as we discussed before. The `default-fuse.vol` file looks like: [...] volume default-replicate-0 type cluster/replicate subvolumes default-client-0 default-client-1 end-volume volume default-replicate-1 type cluster/replicate subvolumes default-client-2 default-client-3 end-volume volume default-dht type cluster/distribute subvolumes default-replicate-0 default-replicate-1 end-volume [...] Then I have stopped the volume and modified the vol file, in order to swap two servers (default-client-3 and default-client-1): [...] volume default-replicate-0 type cluster/replicate subvolumes default-client-0 default-client-3 end-volume volume default-replicate-1 type cluster/replicate subvolumes default-client-2 default-client-1 end-volume volume default-dht type cluster/distribute subvolumes default-replicate-0 default-replicate-1 end-volume [...] re-started and re-mounted the volume. I would expect that new files are replicated now on client-0 and client-3 (called gluster-data00{1,4} in my cluster), but if I create a file they are again replicated on client-0 and client-1 instead. Am I missing some basic step? .a. -- antonio.s.messina@xxxxxxxxx antonio.messina@xxxxxx +41 (0)44 635 42 22 GC3: Grid Computing Competence Center http://www.gc3.uzh.ch/ University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://supercolony.gluster.org/mailman/listinfo/gluster-users