crushmap

Comparing two Ceph CRUSH maps

Comparing two Ceph CRUSH maps 1500 1000 Wido den Hollander

Sometimes you want to test if changes you are about to make to a CRUSH map will cause data to move or not. In this case I wanted to change a rule in CRUSH where it would use device classes, but I didn’t want any of the ~1PB of data in that cluster to move.…

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