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Re: O_DSYNC broken on MacOS X?

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: Bruce Momjian <bruce(at)momjian(dot)us>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Greg Stark <gsstark(at)mit(dot)edu>, "A(dot)M(dot)" <agentm(at)themactionfaction(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: O_DSYNC broken on MacOS X?
Date: 2010-10-27 01:06:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Mon, Oct 25, 2010 at 12:51 PM, Peter Eisentraut <peter_e(at)gmx(dot)net> wrote:
> On mån, 2010-10-25 at 09:33 -0400, Robert Haas wrote:
>> It seems we're still missing some relevant details, because hdparm
>> doesn't seem to work on SCSI devices.  Is sdparm the right utility in
>> that case?  Does anyone know what the correct incantations look like?
> Search the sdparm man page for "Writeback Cache".  It has detailed
> examples.

Here's a patch.  This adds a few more details about sdparm and makes
it clear that it applies to both FreeBSD and Linux.  But, perhaps more
significantly, it rearranges what is currently a fairly long paragraph
into a bulleted list, which I think is more readable.  Comments?

Robert Haas
The Enterprise PostgreSQL Company

Attachment: wal-reliability-list.patch
Description: application/octet-stream (3.6 KB)

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