Sunday, November 04, 2012

Data replication: why 3 copies?

If you ever asked yourself why these storage systems talk about making 3 copies of your data, check out this article that came out in July and that I just reread:

Data Replication in NoSQL Databases

It talks about RAID, why it's not used for big databases, and the reasons for this magical 3 for data replication.

Note that the same reasoning could apply to any replication you may be doing yourself, even at the application level.
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