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今日发现:DRBD

"think of it as RAID1 over TCP. Typically you have one Node in Primary, the other as Secondary, replication target only. But you can also have both Active, for use with a cluster file system."

DRBD, The Distributed Replicated Block Service

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我已经把它送到生产上去跑了,不过还不是100%放心

http://www.danga.com/mogilefs/
这里也有一个open source distributed filesystem