How fast the RAID set or subsystem can transfer the data to the host. Video and image files are examples of large contiguous file transfers that occur in streaming mode. RAID 0 does not provide any data redundancy - if one drive fails, all data is lost. All data is stored twice on two or more identical disk drives. When one disk drive fails, all data is immediately available on the other without any impact on the data integrity - performance in degraded mode is also degraded.
Performance is gained by splitting of functions.
If multiple read requests are pending, the RAID controller will allows reads from different disk drives. If one disk is busy writing the other disk drive can supply read data, at a later time. The RAID controller will update the read drive with data from the already written disk drive. RAID 1 represents a simple and highly efficient solution for data security and system availability. Use RAID 1 when large volumes of data are not required.