On 05/17/2016 01:59 PM, CHEVALIER Pierre wrote: > Hi everyone, > > I have found a similar question in the ML but didn't find the answer I > wanted. > My situation is the following : > We have 2 existing data storage unit with 72TB each, with 10TB left. > Currently these storage unit are synced using rsync periodically. We > want to tansform these 2 nodes into glusterfs bricks without loosing any > data or deleting a node. > > I was thinking setting up the 2 nodes with glusterfs in replica this way : > > 1) Rsync server1/brick1 and server2/brick2 content > 2) Create the gluster replica and start : > gluster volume create volume1 replica 2 transport tcp server1:/brick1 > server2:/brick1 > gluster volume start volume1 Gluster heavily depends on extended attributes for its business logic and hence configuring a brick with existing data means that the extended attributes would not be set for these files and hence this may not work as per the expectation. Given that you have a restriction using another brick, I'd suggest you to do the following: 1. Delete all the contents of server2/brick as this is a secondary copy 2. Create a plain distributed volume in server2 with server2/brick1 2. Start the volume 3. Mount the volume and then do copy the content from server1/brick1 to the mount point. 4. Probe server2 into the cluster 5. Perform an add-brick with server1/brick by gluster volume add-brick <volname> replica 2 <brick name> (Again make sure the content is deleted first) 6. This should trigger the self heal However since the data volume is very high, self heal can take a longer time to sync and finish. Also with a two node setup prevention of split brains is not guaranteed. An arbiter volume or a 3 way replica would be the solution to tackle this problem. Since I am not an AFR expert, I'd like to get a sign off from AFR team (In cc) before you try this out. ~Atin > > Then, should I run a healing process, or stat each files in order to > self heal ? > > What happens if there is a slight difference between the 2 nodes, > mathematically if : > server1/brick1= server2/brick1+delta > > Will the delta part impact server1, or will it be lost ? > > Maybe I worry for nothing, but as these 2 nodes host important data, I > wanted to make sure that eveything is OK. > > Thanks for your help ! > > -- > Pierre CHEVALIER > > > > _______________________________________________ > Gluster-users mailing list > Gluster-users@xxxxxxxxxxx > http://www.gluster.org/mailman/listinfo/gluster-users > _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx http://www.gluster.org/mailman/listinfo/gluster-users
