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| author | Bruce Momjian <bruce@momjian.us> | 2010-02-20 18:28:37 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2010-02-20 18:28:37 +0000 |
| commit | de9ec6543111878dcfc4f42fc0e017f5197d1c7d (patch) | |
| tree | 444eab2d0d0bd0864097272a61a82b1b2a54420d | |
| parent | 7363021df306885f6872d558bae8b5747c92ab3c (diff) | |
| download | postgresql-de9ec6543111878dcfc4f42fc0e017f5197d1c7d.tar.gz postgresql-de9ec6543111878dcfc4f42fc0e017f5197d1c7d.zip | |
Document that many solid-state drives have volatile write-back caches.
| -rw-r--r-- | doc/src/sgml/wal.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml index 2c5ce011126..5f6a6eb2e18 100644 --- a/doc/src/sgml/wal.sgml +++ b/doc/src/sgml/wal.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.61 2010/02/03 17:25:06 momjian Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.62 2010/02/20 18:28:37 momjian Exp $ --> <chapter id="wal"> <title>Reliability and the Write-Ahead Log</title> @@ -59,7 +59,8 @@ same concerns about data loss exist for write-back drive caches as 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 + power failure. Many solid-state drives also have volatile write-back + caches. 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</> to turn off write caching. On <productname>FreeBSD</> use |