RAID 0 enhances performance because multiple physical disks are accessed simultaneously, but it does not provide data redundancy (Figure 1 (English only)). From everything I am seeing on comparisons between both, if you only have 4 disks, the fault tolerance and performance are the same.
It offers the best performance, but no fault tolerance. This RAID calculator computes array characteristics given the disk capacity, the number of disks, and the array type. Figure 1: RAID 0. Fault Tolerance – None
Supported RAID levels are RAID 0, RAID 1, RAID1E, RAID 10 (1+0), RAID 5/50/5E/5EE, RAID … RAID 0: This configuration has striping, but no redundancy of data. RAID 1: Also known as disk mirroring, this configuration consists of at least two drives that duplicate the RAID 1 solves for redundancy so if one of the drives fails, it is easy to replace it by copying over the data from the drive(s) that is still working. Definition: RAID 1 mirroring is an arrangement of hard disks that creates an exact copy (or mirror) of a set of data on two or more disks. RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written to a separate disk drive; I/O performance is greatly improved by spreading the I/O load across many channels and drives; Best performance is achieved when data is striped across multiple controllers with only one drive per controller If you have 6 disks, then 1+0 offers greater fault tolerance, and 0+1 offers greater speed. RAID 1 - Mirroring - Fault Tolerance. The downside of RAID 0 is that there is no redundancy or fault tolerance. Raid 0+1 has fault tolerance. If one of the physical drives fails, all data is lost. This is useful when read performance or reliability are more important than data storage capacity. For example, in a four-disk system using only RAID 0, segment 1 is written to disk 1, segment 2 is written to disk 2, and so on.