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chogata avatar chogata commented on June 6, 2024

You can't have 2 copies of the same chunk on one chunk server (process) - it's the way MooseFS is designed. A second copy will always be considered a duplicate. A solution would be to set up 2 processes of chunk server on the machine with JBOD, give each process half of the drives to keep chunks on. Label the chunk server on the machine with raid with one letter (for example R) and both the chunk servers on the machine with JBOD with another letter (for example J). Then define your storage class as -K J,R and in loose mode. MooseFS will try to keep one copy on J, one copy on R but when R becomes unavailable, it will keep both copies on J labeled chunk servers - one on each.

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