ERROR:  could not read block 8 of relation base/16388/1255: Input/output error



select n.nspname AS tableschema, c.relname AS tablename from pg_class c inner join pg_namespace n on (c.relnamespace = n.oid) where c.relfilenode = 1255;



 tableschema | tablename
-------------+-----------
 pg_catalog  | pg_proc

cp: read error: Input/output error

dmesg
less /var/log/messages 
fsck

event monitor
chkdsk