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Document how to control the disk write cache on Solaris.

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Zdenek Kotala
This commit is contained in:
Bruce Momjian 2007-12-29 17:55:07 +00:00
parent 7dab896afc
commit a84b605a8e
1 changed files with 9 additions and 5 deletions
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doc/src/sgml/wal.sgml
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<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.51 2007/12/16 14:05:12 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.52 2007/12/29 17:55:07 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@ -65,10 +65,14 @@
write caching. On <productname>FreeBSD</> use
<application>atacontrol</>. (For SCSI disks use <ulink
url="http://sg.torque.net/sg/sdparm.html"><application>sdparm</></ulink>
to turn off <literal>WCE</>.) On <productname>Windows</> if
<varname>wal_sync_method</> is <literal>open_datasync</> (the default),
write caching is disabled by unchecking <literal>My
Computer\Open\{select disk
to turn off <literal>WCE</>.) On <productname>Solaris</> the disk
write cache is controlled by <ulink
url="http://www.sun.com/bigadmin/content/submitted/format_utility.jsp"><literal>format
-e</></ulink>. (The Solaris <acronym>ZFS</> file system is safe with
disk write-cache enabled because it issues its own disk cache flush
commands.) On <productname>Windows</> if <varname>wal_sync_method</>
is <literal>open_datasync</> (the default), write caching is disabled
by unchecking <literal>My Computer\Open\{select disk
drive}\Properties\Hardware\Properties\Policies\Enable write caching on
the disk</>. Also on Windows, <literal>fsync</> and
<literal>fsync_writethrough</> never do write caching.