FM <dist-list(at)LEXUM(dot)UMontreal(dot)CA> writes:
> I'e got a very strange (scary) problem.
> ERROR: could not read block 81235 of relation "pg_largeobject":
> Input/output error
This one is very strongly indicative of a disk hardware problem.
The others look like they could be consequences of catalog corruption
ensuing from a flaky disk.
If I were you I'd run some hardware diagnostics. Also see if you can
pg_dump ...
regards, tom lane