There are several different RAID levels that can be used, each with its own characteristics and benefits. Some common RAID levels that hosting providers may offer include:
- RAID 0: Provides striping (data is divided into blocks and distributed across multiple disks) but no redundancy. This can improve performance, but if one disk fails, all data is lost.
- RAID 1: Provides mirroring (data is copied to multiple disks). This provides good fault tolerance but does not increase performance or capacity.
- RAID 5: Provides striping with distributed parity (data is striped across multiple disks, and parity information is also striped across the disks). This can improve both performance and fault tolerance, but requires a minimum of 3 disks.
- RAID 6: Similar to RAID 5, but uses double distributed parity. This provides even better fault tolerance but can impact performance.
- RAID 10 (also known as RAID 1+0): Combines striping (RAID 0) with mirroring (RAID 1). This provides good performance and fault tolerance but requires a minimum of 4 disks.
I often get requests from customers for RAID 10 setup. It provides good performance and fault tolerance, making it a popular choice for most hosting companies.
One of the main benefits of RAID 10 is that it offers a balance of performance and fault tolerance. The striping of RAID 0 helps to improve performance by distributing data across multiple disks, while the mirroring of RAID 1 provides redundancy so that if one disk fails, the data can still be accessed from the other disk. This makes RAID 10 a good choice for applications that require both high performance and high reliability.
Another advantage of RAID 10 is that it can be implemented with a minimum of 4 disks, which is fewer than some other RAID levels such as RAID 5 and RAID 6. This can be an important consideration for hosting companies that need to maximize their storage capacity while still maintaining good performance and fault tolerance.
Overall, I think RAID 10 is a popular choice because it provides a good balance of performance, fault tolerance, and capacity, making it well-suited for a variety of hosting applications.