Re: pg_dump: ERROR: cannot read block 1055 of summary: Input/output error

Dimitri Nagiev  writes:
> using pg_dump I get the following error message:
> pg_dump: ERROR:  cannot read block 1055 of summary: Input/output error
> calls from psql give me similar trouble:
> ERROR:  cannot read block 1055 of summary: Interrupted system call

> There's a good backup from yesterday, but still I am very concerned.

As you should be.  It sounds like your disk has developed a bad sector.
I'd recommend replacing the disk --- where one sector has gone bad,
others may soon follow.

			regards, tom lane