A comparison of two approaches to build reliable distributed file servers
نویسندگان
چکیده
Several existing distributed le systems provide reliability by server replication. An alternative approach is to use dual-ported disks accessible to a server and a backup. We compare the two approaches by examining an example of each. Deceit is a replicated le server that emphasizes exibility. HA-NFS is an example of the second approach that emphasizes e ciency and simplicity. The two le servers run on the same hardware and implement SUN's NFS protocol. The comparison shows that replicated servers are more exible and tolerant of a wider variety of faults. On the other hand, the dual-ported disks approach is more efcient and simpler to implement. When tolerating single failure, dual-ported disks also give somewhat better availability.
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