fault tolerant about erasure code pool

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Hi all,

I'm going to deploy a cluster with erasure code pool for cold storage.
There are 3 servers for me to set up the cluster, 12 OSDs on each server.
Does that mean the data is secure while 1/3 OSDs of the cluster is down,
or only 2 of the OSDs is down , if I set the ec profile with k=4 and m=2.

Thanks
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