D-Link DNS-345 Manual - Page 336

Section 5 - Knowledge Base Knowledge Base What is RAID? RAID, short for Redundant Array of Independent Disks, is a combination of two or more disks with the aim of providing fault tolerance and performance improvement. There are several different levels of RAID, with each one providing a different method of sharing or distributing data amongst the drives. The DNS-345 supports JBOD, RAID 0, RAID 1, RAID 5, RAID 5 + Spare, RAID 10,and Standard. RAID 0 RAID 0 provides data striping, which spreads out blocks of data over all the drives, but does not provide data redundancy. Although performance is improved, the lack of fault tolerance means that if one drive fails, all data in the array will be lost. RAID 1 RAID 1 provides mirroring over multiple disks, with the same read/write speed of a single disk. A RAID 1 array can only be as large as it's smallest member disk. Because the data is stored on multiple disks, RAID 1 provides fault tolerance and protection, in addition to performance advantages. D-Link ShareCenter DNS-345 User Manual 331