| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: corrupt pages detected by enabling checksums |
| Date: | 2013-04-05 01:59:40 |
| Message-ID: | 1365127180.14231.81.camel@jdavis |
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| Lists: | pgsql-hackers |
On Thu, 2013-04-04 at 21:06 -0400, Tom Lane wrote:
> I can't escape the feeling that we'd just be reinventing software RAID.
> There's no reason to think that we can deal with this class of problems
> better than the storage system can.
The goal would be to reliably detect a situation where WAL that has been
flushed successfully was later corrupted; not necessarily to recover
when we find it. Unless it's something like ZFS, I don't think most
software RAID will reliably detect corruption.
A side benefit is that it would also help catch bugs like this in the
future.
I'm not advocating for this particular solution, but I do concur with
Jeff Janes that it's a little bit scary and that we can entertain some
ideas about how to mitigate it.
Regards,
Jeff Davis
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