Re: I/O error during autovacuum

Devrim =?ISO-8859-1?Q?G=DCND=DCZ?= <devrim@gunduz.org> writes:
> I recently started seeing the following in the logs:

> ERROR:  could not read block 46 of relation
> pg_tblspc/16385/8578554/11521501: Input/output error
> CONTEXT:  automatic vacuum of table "foo.pg_toast.pg_toast_8578780"

> Is this *definitely* a disk error, or could it be related to PostgreSQL
> itself?

"Input/output error" is pretty much always indicative of a hardware
problem.  If it's always associated with attempts to access a specific
disk block then it's definitely a bad-sector error.  There might be more
details in the kernel log.

            regards, tom lane