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How to calculate the disk failure level for a 3-way mirror pool?

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On another post in this forum, the following information regarding a 3-way mirroring storage pool is given:

Pool requires a quorum of 50% plus drives to be present to survive.

with 3 way mirror - we have a guarantee of surviving 2 disk failure.
Maintaining the above requirements and providing the guarantee -
mandates us to have minimum 5 disks in pool. As if we loose 2, we still
have 3 in the pool (>50%) for pool to maintain it's quorum.

Just to be sure, I would like Microsoft to confirm that the following calculation applies to any number of disks in a 3-way mirroring pool.

If the number of disks in a 3-way mirroring pool is n, INT(n/2) disks can fail without data loss.

Examples:

With 5 disks, INT(5/2)=INT(2.5)=2 disks can fail.

With 6 disks, INT(6/2)=INT(3)=3 disks can fail.

With 9 disks, INT(9/2)=INT(4.5)=4 disks can fail.

Am I right in this assumption?

Thanks for your answer.

 

 

 



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