| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | David Fetter <david(at)fetter(dot)org> |
| Cc: | PG Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Page Checksums |
| Date: | 2011-12-18 08:14:38 |
| Message-ID: | 4EEDA0EE.7060006@enterprisedb.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On 17.12.2011 23:33, David Fetter wrote:
> What:
>
> Please find attached a patch for 9.2-to-be which implements page
> checksums. It changes the page format, so it's an initdb-forcing
> change.
>
> How:
> In order to ensure that the checksum actually matches the hint
> bits, this makes a copy of the page, calculates the checksum, then
> sends the checksum and copy to the kernel, which handles sending
> it the rest of the way to persistent storage.
>...
> If this introduces new failure modes, please detail, and preferably
> demonstrate, just what those new modes are.
Hint bits, torn pages -> failed CRC. See earlier discussion:
http://archives.postgresql.org/pgsql-hackers/2009-11/msg01975.php
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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