calculating maximum number of disk and node failure that can be handled by cluster with out data loss

[kevin parrikar <kevin.parker092@xxxxxxxxx>]

I have 4 node cluster each with 5 disks (4 OSD and 1 Operating system also hosting 3 monitoring process) with default replica 3.

Total OSD disks : 16 

Total Nodes : 4

How can i calculate the 

• Maximum number of disk failures my cluster can handle with out  any impact on current data and new writes.
  
• Maximum number of node failures  my cluster can handle with out any impact on current data and new writes.

Thanks for any help

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