Here is a good video that explains the difference between RAID 0 and RAID 1 arrays (a shorter video by the same person is on YouTube here): And if one of the disk fails, data can still be recovered because it is intact on the second disk (most RAID 1 setups use only 2 disks, though some may use more), which means RAID 1 is fault tolerant. This results in multiple copies of data ( redundancy). There is no striping the entire data is mirrored on each disk. Recovering from a failure requires powering down the RAID so data is not accessible during the recovery.Ī RAID 1 setup is different. Storage capacity is effectively cut in half because two copies of all data are stored. If one drive in the RAID fails, all data is lost. Fault tolerance with easy recovery (simply copy the contents of one drive to another) Great performance, even if writes are a little slower compared with RAID 0. Speed: very fast reads and writes no overhead for parity calculation. Minimum number of physical disks required Where data reliability is less of a concern and speed is important. RAID 1 offers slower write speeds but could offer the same read performance as RAID 0 if the RAID controller uses multiplexing to read data from disks. In theory RAID 0 offers faster read and write speeds compared with RAID 1. Mirroring, redundancy and fault tolerance Yes data is striped (or split) evenly across all disks in the RAID 0 setup. Differences - Similarities - RAID 0 versus RAID 1 comparison chart
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