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Removing a disk on every datanode - for a elasticsearch node


i want to put a 1:1 elastic cluster inside my hadoop cluster, 1 elastic node on each hadoop datanode.


to not interfere too much with the hadoop cluster, i would like to run the elastic nodes on a disk of it's own.


the setup:


CDH 5.6.0


datanode disk layout(in mounted dirs):








20+ data nodes


say i wish to remove disk10 from each datanode, how do i do that without data loss?


removing the disk on a decommissioned datanote, and later recomissioning it, takes too long time. - any hint on making this process faster?


can i use the rebalancer? ( i saw there is internal datanode balancer in CDH5.8)


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