4.5. Task 4.5: Implementing Disk Fault Tolerance with RAID
A significant aspect of information systems security relates to protecting against the loss of data and ensuring the data's availability. Data is written on hard disks. These disks can and will fail, resulting in data loss and loss of availability of the data. Fault-tolerant disk arrays are a common approach to mitigating the losses related to disk failure.
Redundant Array of Independent Disks (RAID) systems can be implemented to provide fault tolerance of disks. The two most common implementations of RAID are RAID1 (Mirroring) and RAID5 (Stripe Set with Parity).
RAID1 requires two disks and provides no performance boost or degradation. It provides for one disk to be lost, yet all of ...