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hooks-cm3.sh | ||
README | ||
tetris.sh |
This CONTRIB directory contains some unsupported _example_ bash scripts for MARS background data migration. Method: 0) start point: all resources have two replicas, each on a pair of nodes. "marsadm view all" shows this as [2/2], meaning two replicas out of two potential replication hosts. 1) use "marsadm join-cluster" for merging two ordinary replication pairs into a 4-fold (quadruple) MARS cluster. Now we have [2/4]. 2) create two additional resource replicas via "marsadm join-resource". The new replicas are created in background while the data is being updated during ordinary production. Finally we have [4/4] replicas. 3) handover the primary to one node of the _new_ pair. 4) use "marsadm leave-resource" to get rid of the _old_ two replicas. New replica status is again [2/4], but the the replicas have been migrated to the new pair in the meantime. 5) Finally, use "marsadm split-cluster" to go back to [2/2]. HINT: The shell script code is split into two parts: a generic part which should be usable at more MARS sites in the world, and a 1&1 specific part which will only work in the 1&1 Shared Hosting Linux environment. However, by looking at the code, you should be able to create your own adaptations.