How to evaluate mongodb shard clusters redundancy level? -


i new mongodb , tried touch base mongo db documentation.

here word saw "each shard replica set"? mean, if have 10 shards, each data set have 10 copies in distributed system? if case, point , can redundancy level tuned 2, since if have 30 shards , redundancy level set 2 suffice high availability. or misunderstanding mongo db terminologies?

after reading documentation more throughly. answering own question here.

http://docs.mongodb.org/manual/core/replica-set-members/

the "redundancy level" of mongo db of shard cluster through replica sets. replica sets has concept of members, number of members mean number of redundancies of data. minimum of redundancies level: replica set should have @ least 3 members since 1 can arbiter not hold data, 2. max 12 documentation mentioned.

replica set members can configured here: http://docs.mongodb.org/manual/reference/replica-configuration/


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