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Clarify documentation that journaling is not required for WAL or data files.

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This commit is contained in:
Bruce Momjian
2008-12-18 22:21:16 +00:00
parent 4ac592be6c
commit fa6116a3da
1 changed files with 3 additions and 3 deletions
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6
doc/src/sgml/wal.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.55 2008/12/10 11:05:49 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.56 2008/12/18 22:21:16 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@@ -138,8 +138,8 @@
<tip>
<para>
Because <acronym>WAL</acronym> restores database file
contents after a crash, it is not necessary to use a
journaled filesystem for reliability. In fact, journaling
contents after a crash, journaled filesystems are necessary for
reliable storage of the data files or WAL files. In fact, journaling
overhead can reduce performance, especially if journaling
causes file system <emphasis>data</emphasis> to be flushed
to disk. Fortunately, data flushing during journaling can