Re: WAL and O_DIRECT

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Ravi Krishna <s(dot)ravikrishna(at)aim(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: WAL and O_DIRECT
Date: 2015-05-14 15:55:33
Message-ID: 21483.1431618933@sss.pgh.pa.us
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Ravi Krishna <s(dot)ravikrishna(at)aim(dot)com> writes:
> However our DB2 folks are raising a concern that PG WAL writes may not be crash safe, unless we are using write back technology in SAN or SSD , which we are using.

What's your point exactly? If the underlying hardware does not provide
durable writes, there's nothing PG (or DB2) can do to fix that.

regards, tom lane

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