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Diffstat (limited to 'doc/src/sgml/runtime.sgml')
| -rw-r--r-- | doc/src/sgml/runtime.sgml | 34 |
1 files changed, 29 insertions, 5 deletions
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml index 944c5658c3b..c08650dc280 100644 --- a/doc/src/sgml/runtime.sgml +++ b/doc/src/sgml/runtime.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.384 2007/11/04 21:50:28 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.385 2007/11/08 15:21:03 momjian Exp $ --> <chapter Id="runtime"> <title>Operating System Environment</title> @@ -160,10 +160,34 @@ postgres$ <userinput>initdb -D /usr/local/pgsql/data</userinput> locale setting. For details see <xref linkend="multibyte">. </para> - <para> - If using non-local (network) file systems, see <xref - linkend="manage-ag-tablespaces-nfs">. - </para> + <sect2 id="creating-cluster-nfs"> + <title>Network File Systems</title> + + <indexterm zone="creating-cluster-nfs"> + <primary>Network File Systems</primary> + </indexterm> + <indexterm><primary><acronym>NFS</></><see>Network File Systems</></> + <indexterm><primary>Network Attached Storage (<acronym>NAS</>)</><see>Network File Systems</></> + + <para> + Many installations create database clusters on network file systems. + Sometimes this is done directly via <acronym>NFS</>, or by using a + Network Attached Storage (<acronym>NAS</>) device that uses + <acronym>NFS</> internally. <productname>PostgreSQL</> does nothing + special for <acronym>NFS</> file systems, meaning it assumes + <acronym>NFS</> behaves exactly like locally-connected drives + (<acronym>DAS</>, Direct Attached Storage). If client and server + <acronym>NFS</> implementations have non-standard semantics, this can + cause reliability problems (see <ulink + url="http://www.time-travellers.org/shane/papers/NFS_considered_harmful.html"></ulink>). + Specifically, delayed (asynchonous) writes to the <acronym>NFS</> + server can cause reliability problems; if possible, mount + <acronym>NFS</> file systems synchonously (without caching) to avoid + this. (Storage Area Networks (<acronym>SAN</>) use a low-level + communication protocol rather than <acronym>NFS</>.) + </para> + + </sect2> </sect1> |