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Document ATAPI FLUSH CACHE EXT.

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Bruce Momjian
2010-02-27 20:16:17 +00:00
parent c685b942e5
commit 9295eea839
2 changed files with 137 additions and 17 deletions
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doc/src/sgml/wal.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.63 2010/02/27 01:39:46 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.64 2010/02/27 20:16:17 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@@ -60,7 +60,7 @@
exist for disk controller caches. Consumer-grade IDE and SATA drives are
particularly likely to have write-back caches that will not survive a
power failure, though <acronym>ATAPI-6</> introduced a drive cache
flush command that some file systems use, e.g. <acronym>ZFS</>.
flush command (FLUSH CACHE EXT) that some file systems use, e.g. <acronym>ZFS</>.
Many solid-state drives also have volatile write-back
caches, and many do not honor cache flush commands by default.
To check write caching on <productname>Linux</> use