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From: AndreaH
Date: Tue, 19 Aug 2008 11:19:07 -0700 (PDT)
Local: Wed, Aug 20 2008 4:19 am
Subject: caching DNS and TTL
We have two redundant facilities: east and south. Often we’ll switch
100% of traffic to one site or the other. We noticed an abnormally high volume of 404 errors on 8/5. Googlebot spidered cached pages on our east site, which at the time was down for maintenance. Our south site at the time was fully functional. However, Googlebot continued to spider the east site while it was down. How does Googlebot cache DNS and/or use TTL? On 8/16 the east site was down for four hours for network
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