Re: Strange error while executing query from front end:

Andrew Sullivan <ajs@crankycanuck.ca> writes:
> On Mon, Jan 16, 2006 at 09:27:30AM +0530, Mavinakuli, Prasanna (STSD) wrote:
>> ERROR:  xlog flush request 0/108EA5F8 is not satisfied --- flushed only
>> to 0/1813C60

> If I had to guess, I'd say you're having a hard disk failure of some
> kind.  In particular, this tells you that a flush of the write ahead
> log isn't completing.  That's a Bad Thing.

Actually it looks like corrupt data to me: some page's LSN field
contains a value that is past the actual end of WAL, and therefore
isn't a correct copy of the location of the last WAL record affecting
that page, as it's supposed to be.

Could have resulted from a hardware error, but it's hard to tell.

            regards, tom lane