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Manual Reference Pages  -  MOGILEFS::REPLICATIONPOLICY::MULTIPLEHOSTS (3)

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NAME

MogileFS::ReplicationPolicy::MultipleHosts -- default replication policy

CONTENTS

RULES

This policy tries to put files onto devices which are on different hosts. If you only have 1 host and 2 devices on that one host, it obviously can’t, so it’ll grudgingly put it on the same host. But if you request a minimum replica count of 2 and have 3 devices, it’ll put 2 copies on different hosts. If you have 4 devices on 2 hosts, and request a minima replica count of 3, you’ll get 3 copies on different devices, but two of those devices will be on the same host, and that’s considered acceptable, since you have multiple hosts covered at least.

SEE ALSO

MogileFS::Worker::Replicate

MogileFS::ReplicationPolicy

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perl v5.20.3 MOGILEFS::REPLICATIONPOLICY::MULTIPLEHOSTS (3) 2013-10-30

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