Description
RAID in very critical environment is composed by disks that mirror the same data. the average, every MTTF = 100 days, of the disks fails. In this case, recovery consist in replacing the broken disk, reconstruct the data, and return normal operation. This requires average of MTTR = days. Should also the second disk fail during the recovery stage, the system will go in fault state, where restored, it will require total reconstruction of the system from the backup. This will take average days.
Considering all failure and recovery distribution exponential, and the system starts in state where both disks working:
• Draw the Markov Chain of the model • Compute the infinitesimal generator and solve the corresponding differential equations • Show the probability of the various states for the T = [0, 10000] days
