Paweł Jakub Dawidek - HAST -- Highly Available storage for FreeBSD (questions, polish)





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Published on Aug 19, 2010

Abstract: HAST (Highly Available STorage) is a software for synchronous data replication between two cluster nodes working in primary-secondary model.
Data is replicated on block-level (GEOM-level), thus it is independed on file system type and applications that are running on top of it.
When primary node fails, the secondary node should be able to fsck the file system (eg. UFS) and mount it without losing a single bit of data. In case of ZFS file system it is just a matter of importing a pool on secondary node. When primary node comes back, HAST will synchronize only the difference between the nodes.

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