| From: | Bruce Momjian <bruce(at)momjian(dot)us> |
|---|---|
| To: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
| Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Aidan Van Dyk <aidan(at)highrise(dot)ca>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Block-level CRC checks |
| Date: | 2009-12-01 12:42:10 |
| Message-ID: | 200912011242.nB1CgAr22870@momjian.us |
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| Lists: | pgsql-hackers |
Simon Riggs wrote:
> On Tue, 2009-12-01 at 07:05 -0500, Bruce Momjian wrote:
>
> > I assume torn pages are 99% of the reported problem, which are
> > expected and are fixed, and bad hardware 1%, quite the opposite of your
> > numbers above.
>
> On what basis do you make that assumption?
Because we added full page write protection to fix the reported problem
of torn pages, which we had on occasion; now we don't. Bad hardware
reports are less frequent.
And we know we can reproduce torn pages by shutting of power to a server
without battery-backed cache. We don't know how to produce I/O failures
on demand.
--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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