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Re: Page Checksums

From: Jeff Davis <pgsql(at)j-davis(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, David Fetter <david(at)fetter(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Page Checksums
Date: 2011-12-27 18:54:40
Message-ID: 1325012080.11655.5.camel@jdavis (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, 2011-12-19 at 22:18 +0200, Heikki Linnakangas wrote:
> Or you could just use a filesystem that does CRCs...

That just moves the problem. Correct me if I'm wrong, but I don't think
there's anything special that the filesystem can do that we can't.

The filesystems that support CRCs are more like ZFS than ext3. They do
all writes to a new location, thus fragmenting the files. That may be a
good trade-off for some people, but it's not free.

Regards,
	Jeff Davis


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