D-Link DNS-340L User Manual - Page 431

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-340L supports Standard, JBOD, RAID 0, 1, 5, and 10. A RAID array will degrade when one of the hard drives fails. Auto-Rebuild allows a degraded RAID array to be automatically rebuilt when the failed hard drive is replaced by automatically restoring data from the existing hard drive to the newly inserted hard drive. Standard Creates two separate volumes (or one volume if only one hard drive is present). Each hard drive is its own volume improving performance but the lack of any RAID or mirroring means that if one drive fails, all data on the volume will be lost. JBOD (Linear) Combines both hard drives in a linear fashion which will create one large volume geared towards maximum available space. It offers no redundancy and limited data protection. RAID 0 Combines both hard drives in a striped fashion which will create one large volume geared towards maximum performance. Although performance is improved, the lack of fault tolerance means that if one drive fails, all data in the array will be lost. D-Link ShareCenter DNS-340L User Manual 429