| From: | Florian Weimer <fweimer(at)bfk(dot)de> |
|---|---|
| To: | Greg Stark <greg(dot)stark(at)enterprisedb(dot)com> |
| Cc: | Aidan Van Dyk <aidan(at)highrise(dot)ca>, "Jonah H(dot) Harris" <jonah(dot)harris(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Brian Hurt <bhurt(at)janestcapital(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Block-level CRC checks |
| Date: | 2008-10-31 10:21:21 |
| Message-ID: | 824p2tawv2.fsf@mid.bfk.de |
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| Lists: | pgsql-hackers |
* Greg Stark:
> Wal logged changes are safe because of full_page_writes. Hint bits are
> safe because either the old or the new value will be on disk and we
> don't care which.
Is this really true with all disks? IBM's DTLA disks didn't behave
that way (an interrupted write could zero a sector), and I think the
text book algorithms don't assume this behavior, either.
--
Florian Weimer <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstraße 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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