Reprints from my posting to SAN-Tech Mailing List and ...


[san-tech][02140] "Disaster Recovery by Google", 2010/03/04, Official Google Enterprise Blog

Date: Tue, 09 Mar 2010 21:42:33 +0900
2010年 3月 4日付けの Official Google Enterprise Blogに

"Disaster Recovery by Google", March 04, 2010
 Posted by Rajen Sheth, Senior Product Manager, Google Apps


  "For Google Apps customers, our RPO design target is zero, and our
   RTO design target is instant failover. We do this through live or
   synchronous replication: every action you take in Gmail is
   simultaneously replicated in two data centers at once, so that if
   one data center fails, we nearly instantly transfer your data over
   to the other one that's also been reflecting your actions."

   Our goal is not to lose any data when it's transferred from one
   data center to another, and to transfer your data so quickly that
   you don't even know a data center experiences an interruption. Of
   course, no backup solution from us or anyone else is absolutely
   perfect, but we've invested a lot of effort to help make it second
   to none."

  "And it's not just to preserve your Gmail accounts. You get the same
   level of data replication for all the other major applications in
   the Apps suite: Google Calendar, Google Docs, and Google Sites."

  "Here are a few of the reasons why we're able to offer you this level
   of service. First, we operate many large data centers simultaneously
   for millions of users, which helps reduce cost while increasing
   resiliency and redundancy. Second, we're not wasting money and
   resources by having a data center stand-by unused until something
   goes wrong - we can balance loads between data centers as needed.

   Finally, we have very high speed connections between data centers,
   so that we can transfer data very quickly from one set of servers to
   another. This let us replicate large amounts of data simultaneously."

Official Google Enterprise Blogへの署名入り投稿なので、既にシステムは

"Google Steps Up Data Protection With Synchronous Replication"
 March 5, 2010

  "Google on said on 4 March that it has added a storage disaster-recovery
   feature that’s growing in demand - synchronous data replication - to
   its Google Apps lineup, which includes Google Docs, Gmail, Google
   Sites, Calendar and several others."


The Data Liberation Front
  "The Data Liberation Front is an engineering team at Google whose
   singular goal is to make it easier for users to move their data in
   and out of Google products."

"Run your business, not your email server
 Gmail for business offers 25 GB of storage per user, powerful spam
 filtering, BlackBerry and Outlook interoperability, and a 99.9%
 uptime SLA."

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