problems with a server... mySQL?

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http://serverfault.com – I am having strange problems on my server in the last days. When the problems happen, all domains hosted on this server present an error. For example, some of the sites running wordpress start to present this error (that appears to be related to mySQL): Warning: session_start() [function.session-start]: open(/tmp/sess_1cb85274a8b13078509e17b12e479c2e, O_RDWR) failed: Read-only file system (30) in /home/admin/domains/mydomain.com/public_html/blog/wp-content/plugins/alinks/alinks.php on line 23 Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent (HowTos)