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FATAL: invalid value for parameter "wal_sync_method": "open_datasync"

From: Francesco Dalla Ca' <f(dot)dallaca(at)cineca(dot)it>
To: pgsql-admin(at)postgresql(dot)org
Subject: FATAL: invalid value for parameter "wal_sync_method": "open_datasync"
Date: 2005-06-16 14:35:58
Message-ID: 42B18E4D.6070603@cineca.it (view raw or flat)
Thread:
Lists: pgsql-admin
O.S.:
SuSE SLES-8 (i386)
VERSION = 8.1

After some test with the "syncbench" posted on performance mailing-list 
(http://archives.postgresql.org/pgsql-performance/2004-09/msg00080.php)
i have obtained that open() with O_DSYNC was the fastest sync method.
I want to test this for parameter "wal_sync_method" on a test workload 
directly on Postgres and i have configured that on postgresql.conf file:

wal_sync_method = open_datasync

But at the server start:

 > pg_ctl -D /db10/postgres/data start
postmaster starting
 > FATAL:  invalid value for parameter "wal_sync_method": "open_datasync"

What's wrong?

Best regards.

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Subject: Re: FATAL: invalid value for parameter "wal_sync_method":
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