From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Gregory Stark <stark(at)enterprisedb(dot)com> |
Cc: | "Zdenek Kotala" <Zdenek(dot)Kotala(at)Sun(dot)COM>, pgsql-bugs(at)postgresql(dot)org, "alex" <an(at)clickware(dot)de> |
Subject: | Re: Bug (#3484) - Invalid page header again |
Date: | 2007-12-18 19:08:33 |
Message-ID: | 3354.1198004913@sss.pgh.pa.us |
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Lists: | pgsql-bugs |
Gregory Stark <stark(at)enterprisedb(dot)com> writes:
> I don't understand this 9728 bytes. Postgres blocks are 8192 bytes. Are you
> saying one whole block is trashed and then part, but not all, of the next
> block?
> What's the block size of the ZFS filesystem? And what exactly does the trash
> data look like?
It seems relevant that 9728 is a multiple of 512 (and not of any larger
power of 2). That makes it sound like the misfeasance happened at the
disk block level. Postgres doesn't internally deal in 512-byte chunks
anywhere I can think of, so to posit a DB bug you have to come up with
some other explanation why exactly that much of the block got trashed.
A filesystem-level software bug is not out of the question, though
this still smells to me like it's a hardware issue of some kind.
regards, tom lane
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