Strange/random overload of the server

From: Georgi Ivanov <georgi(dot)r(dot)ivanov(at)gmail(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: Strange/random overload of the server
Date: 2010-09-02 14:14:48
Message-ID: AANLkTik1uUp5UZ4v81OBh4OsK+iCwTp4MTz-Mj7bLA9D@mail.gmail.com
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Hi,
I have some strange problems with my server.

Randomly the server gets overloaded with queries.
Queries are accepted and never executed, thus reaching max_connections limit
.
This I/O wait in top command reaches up to 90%
Couple of restarts (and sometimes vacuum and reindex of my biggest tables)
fix it for a while (about a week or so).
I suspected full-text indexes going wild, but after i dropping indexes i had
same issues again.
I found that file system have errors. Can this lead to this kind of behavior
?
I am planning downtime to fix the FS errors since this can't be done on
mounted file systems.

Any ideas ?

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