Western Digital ShareSpace User Guide - Page 142
RAID 0 Striped, RAID 1 Mirrored, Two Mirror, Span Spanned, RAID 5, RAID 10
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WD SHARESPACE USER MANUAL RAID (Redundant Array of Independent Drives) refers to an array of multiple independent hard drives that provide high performance and reliability. RAID function depends on the number of drives present and the RAID level selected. The WD ShareSpace supports the following RAID levels: • RAID 0 (Striped) - provides data striping (spreading out blocks of each file across multiple hard drives) but no redundancy. This improves performance but does not deliver fault tolerance. If one drive fails then all data in the array is lost. • RAID 1 (Mirrored) - provides disk mirroring. Mirroring creates an exact copy (or mirror) of a set of data on two drives, which increases reliability compared to a single drive. If either drive fails, the other continues to function as a single drive until the failed drive is replaced. • Two Mirror - Two Mirror mode is available when four drives are installed in the WD ShareSpace. In this mode, two independent RAID 1 volumes are created. • Span (Spanned) - combines drives into a linear fashion to create one large logical volume. Unlike RAID 0, which "stripes" all data bitwise to all drives, the volume is linear across both drives. A spanned drive is literally like a single bigger drive, in that files written to the volume earlier go to the "beginning" of the volume, on the first physical drive. As the volume fills, files written later are written toward the "end" of the volume, on the second drive. Like RAID 0, no data redundancy is provided. If one of the drives fails, all data is lost. • RAID 5 - requires a minimum of 3 drives to implement. Similar to RAID 0 but adds fault tolerance by including parity information with the data. Parity is generated on Writes, recorded in a distributed location, and checked on Read. In this mode, failure of a single drive does not cause loss of data. • RAID 10 - requires a minimum of four drives to implement. Provides data striping on top of disk mirroring. NETWORK STORAGE MANAGER: ADVANCED MODE - 137
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