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total mongodb storage size

total mongodb storage size  using -'mongodb'

I have a sharded and replicated MongoDB with dozens millions of records. I know that Mongo writes data with some padding factor, to allow fast updates, and I also know that to replicate the database Mongo should store operation log which requires some (actually, a lot of) space. Even with that knowledge I have no idea how to estimate the actual size required by Mongo given a size of a typical database record. By now I have a descrepancy with a factor of 2 - 3 between weekly repairs.

So the question is: How to estimate a total storage size required by MongoDB given an average record size in bytes?

asked Sep 28, 2015 by mtabakade
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answered Sep 28, 2015 by r3tt