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

diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index e69463a9e22ce5ccbcc2063f615879f9d2eac3fd..a54fbc685e024c0c8ef381c26f0fe6559f6864c7 100644 (file)
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -1,4 +1,4 @@
-
+
 
 
  Reliability and the Write-Ahead Log
@@ -138,8 +138,8 @@
    
     
      Because WAL 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 data to be flushed
      to disk.  Fortunately, data flushing during journaling can