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Write cache doc cleanups

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Greg Smith
This commit is contained in:
Bruce Momjian 2007-12-10 14:51:10 +00:00
parent 51a33519b0
commit 3e113efdf0
1 changed files with 3 additions and 3 deletions
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doc/src/sgml/wal.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.47 2007/12/10 14:05:05 momjian Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.48 2007/12/10 14:51:10 momjian Exp $ -->
<chapter id="wal">
<title>Reliability and the Write-Ahead Log</title>
@ -57,11 +57,11 @@
And finally, most disk drives have caches. Some are write-through
while some are write-back, and the
same concerns about data loss exist for write-back drive caches as
exist for disk controller caches. Consumer-grade IDE drives are
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. To check write caching on <productname>Linux</> use
<command>hdparm -I</>; it is enabled if there is a <literal>*</> next
to <literal>Write cache</>. <command>hdparm -W</> can to turn off
to <literal>Write cache</>. <command>hdparm -W</> to turn off
write caching. On <productname>FreeBSD</> use
<application>atacontrol</>. (For SCSI disks use <ulink
url="http://sg.torque.net/sg/sdparm.html"><application>sdparm</></ulink>