Abstract
TOFF-2 is a high-performance fault-tolerant file service featuring in a new Symmetric Primary Backup (SPB) replication model. This model lets all replicated servers in a service share the load of a traditional primary server, and minimizes the communication overhead between servers. TOFF-2 is also totally transparent to the client machines, and any host with an NFS client implementation can use the fault-tolerant service provided by TOFF-2 without any modification. The clients do not have to know anything about replication and server failures, since the TOFF-2 service cluster looks exactly like a single server over the network. The concept and design of TOFF-2 is introduced in this article, and statistics taken from tests on a prototype implementation show promising results.
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