Biostar N4SLI-A9 N4SLI-A9 user's manual - Page 32

N4SLI-A9 RAID 1: Every read and write is actually carried out in parallel across 2 disk drives in a RAID 1 array system. The mirrored (backup) copy of the data can reside on the same disk or on a second redundant drive in the array. RAID 1 provides a hot-standby copy of data if the active volume or drive is corrupted or becomes unavailable because of a hardware failure. RAID techniques can be applied for high-availability solutions, or as a form of automatic backup that Block 1 Block 1 eliminates tedious manual backups Block 2 Block 2 Block 3 Block 3 to more expensive and less reliable media. Features and Benefits - Drives: Minimum 2, and maximum is 2. - Uses: RAID 1 is ideal for small databases or any other application that requires fault tolerance and minimal capacity. - Benefits: Provides 100% data redundancy. Should one drive fail, the controller switches to the other drive. - Drawbacks: Requires 2 drives for the storage space of one drive. Performance is impaired during drive rebuilds. - Fault Tolerance: Yes. RAID 0+1: RAID 0 drives can be mirrored suing RAID 1 techniques. Resulting in a RAID 0+1 solution for improved performance plus resiliency. Features and Benefits Block 1 Block 3 Block 5 Block 2 Block 4 Block 6 Block 1 Block 3 Block 5 Block 2 Block 4 Block 6 - Drives: Minimum 4, and maximum is 6 or 8, depending on the platform. - Benefits: Optimizes for both fault tolerance and performance, allowing for automatic redundancy. May be simultaneously used with other RAID levels in an array, and allows for spare disks. - Drawbacks: Requires twice the available disk space for data redundancy, the same as RAID level 1. - Fault Tolerance: Yes. 30