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The PostgreSQL 9.0 Reference Manual - Volume 3 - Server Administration Guide
by The PostgreSQL Global Development Group
Paperback (6"x9"), 274 pages
ISBN 9781906966072
RRP £9.95 ($14.95)

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3.2.1 Network File Systems

Many installations create database clusters on network file systems. Sometimes this is done directly via NFS, or by using a Network Attached Storage (NAS) device that uses NFS internally. PostgreSQL does nothing special for NFS file systems, meaning it assumes NFS behaves exactly like locally-connected drives (DAS, Direct Attached Storage). If client and server NFS implementations have non-standard semantics, this can cause reliability problems (see http://www.time-travellers.org/shane/papers/NFS_considered_harmful.html). Specifically, delayed (asynchronous) writes to the NFS server can cause reliability problems; if possible, mount NFS file systems synchronously (without caching) to avoid this. Also, soft-mounting NFS is not recommended. (Storage Area Networks (SAN) use a low-level communication protocol rather than NFS.)

ISBN 9781906966072The PostgreSQL 9.0 Reference Manual - Volume 3 - Server Administration GuideSee the print edition