Disk resiliency and redundancy
We are going to look at different disk setups—some of which can provide fault tolerance or redundancy, meaning that if a disk fails, then the data is still available. RAID 0 is used for faster disk access, but provides neither fault tolerance nor redundancy. Let's first look at the different RAID setups, as these will be heavily tested.
Redundant array of independent disks
There is a need for the disk setup on servers to provide redundancy; this is where if one disk fails, the data is still available. We have already looked at failover clustering in Chapter 5, Understanding Network Components, where two servers share a quorum disk—the single point of failure in that scenario would be the shared disk. We are going to look at different Redundant Array of Independent Disks (RAID) levels and their characteristics:
- RAID 0: RAID 0 uses a minimum of two disks with a maximum of 32 disks:
Figure 10: RAID 0
This is known as a stripe set, as the data is written across Disks...
