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.