Unfortunately even the cgi could not get at the time of outage . more investigating shows the disks are completely idle but squid uses 100% cpu . Also i was able to refresh the event 1 second before the time of outage and it shows "storeDigestRebuildStart" and "storeDigestRewriteStart" would start 1.438 later . the info part of squid is here because i couldn't find anything . before after -- View this message in context: http://squid-web-proxy-cache.1019090.n4.nabble.com/Squid-naps-each-3600-seconds-tp4662811p4662817.html Sent from the Squid - Users mailing list archive at Nabble.com.