Keeping Data on N Separate Physical Computers

Runar Jordahl runar.jordahl at
Thu Feb 24 06:44:42 EST 2011

As far as I understand you need to buy Riak EnterpriseDS to have any
guarantee for durability & availability for data you store in Riak:

“There are no guarantees that the (…) replicas will go to (N) separate
physical nodes; however, the built-in functions for determining where
replicas go attempts to distribute the data evenly."

Basically, whatever N you set, they might end up on the same hard
disk, meaning that one hard disk crash can mean you lose data and/or
make data not readable. Probability is low, but it can happen.

Am I correct?

Kind regards

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