Google on March 4 said 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
other apps.
The search and Web services giant told eWEEK that it, in fact, has been using
replication for Gmail for a few years, but that it has now extended the feature
to all of its online tools and services.
Digital file replication is a method in which data files are copied and filed
in one or more locations apart from the central data center as a backup and
disaster recovery mechanism.
Data replication is the process of copying a portion of a database from one
environment to another and keeping the subsequent copies of the data in sync
with the original source. Changes made to the original source are propagated to
the copies of the data in other environments.
"We've been quietly working on this for a while," Google spokesman
Andrew Kovacs told eWEEK. "It's nothing that a user will ever see online.
It all works in the background and doesn't affect anything the user does."
Files stored in Google Docs or in Gmail files are broken up into digital pieces
(some people call them "chunks") and stored on random servers in Google
data centers around the world. When the time comes to gather the file back up
for download or online viewing, the pieces are quickly reassembled for the
user's session.
"Here are a few of the reasons why we're able to offer you this level of
service," Rajen Sheth, senior product manager of Google Apps, wrote in a
blog post. "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."
Replacing SAN Functionality
Sheth said that Google Apps and its backup and disaster recovery systems—which
now include the replication feature—can replace a lot of the functionality that
a conventional data center SAN (storage area
network) brings to an enterprise, and for a lot less up-front cost.
"SANs are expensive, and even then, you're out of luck if your data center
goes down," Sheth said. "So the largest enterprises will build an
entirely new data center somewhere else, with another set of identical mail
servers, another SAN and more people to
staff them. But if, heaven forbid, disaster strikes both your data
centers, you're toast.
"Google Apps customers don't need to worry about any of this for the data
they create and store within Google Apps. They get best-in-class disaster
recovery for free, no matter their size."
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