http://www.cloudhostingmag.com Sat, 21 May 2011 02:25:08 +0000 en hourly 1 http://wordpress.org/?v=3.3 http://www.cloudhostingmag.com/2010/03/what-is-time-to-live-ttl-faq/ http://www.cloudhostingmag.com/2010/03/what-is-time-to-live-ttl-faq/#comments Mon, 15 Mar 2010 06:09:00 +0000 admin http://www.cloudhostingmag.com/?p=163 Continue reading →]]> Time to Live or TTL is the time a file is cached on at a CDN ‘edge’ location. Content Delivery Networks (CDNs) work by caching files at numerous world edge locations, when a file is requested for the first time from a CDN the CDN requests the file from the data center and it then caches it at that edge location. The cache at the edge location will be refreshed once the TTL expires. So if the TTL is set to 2 weeks then the files will be cached at the various edge locations for a 2 weeks.

]]> http://www.cloudhostingmag.com/2010/03/what-is-time-to-live-ttl-faq/feed/ 0 http://www.cloudhostingmag.com/2010/02/what-are-a-compute-cycles/ http://www.cloudhostingmag.com/2010/02/what-are-a-compute-cycles/#comments Thu, 25 Feb 2010 09:05:51 +0000 admin http://www.cloudhostingmag.com/?p=16 Continue reading →]]> As cloud hosting is only charged on a per-use basis it is to define units of all the resources that are used by a site. Bandwidth, disk space etc are all familiar but there is also a charge levied for the processing (ie CPU + RAM).
Providers have different methods for splitting and charging for processing power. Amazon Web Services and Windows Azure break out a server into a hourly usage and charge based on the time a server of a defined specification is used.
RackSpace Cloud has a different approach and breaks processing time into Compute Cycles and 10,000 compute cycles are what a 2.8Ghz processor with approx 4GB RAM would consume under moderate load for one month.

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