Dell PowerVault MD3000i Hardware Owner's Manual - Page 31
Supported RAID Levels, RAID 0
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Supported RAID Levels RAID levels determine the way in which data is written to physical disks. Different RAID levels provide different levels of accessibility, redundancy, and capacity. Using multiple physical disks has several advantages over using a single physical disk, including: • Placing data on multiple physical disks, called striping, means that input/output (I/O) operations can occur simultaneously and improve performance. • Storing redundant data on multiple physical disks using mirroring or parity supports reconstruction of lost data if an error occurs, even if that error is the failure of a physical disk. Each RAID level provides different performance and protection. You should select a RAID level based on the type of application, access, fault tolerance, and data you are storing. The storage array supports RAID levels 0, 1, 5, and 10. RAID 0 RAID 0 uses disk striping to provide high data throughput, especially for large files in an environment that requires no data redundancy. RAID 0 breaks the data down into segments and writes each segment to a separate physical disk. I/O performance is greatly improved by spreading the I/O load across many physical disks. Although it offers the best performance of any RAID level, RAID 0 lacks data redundancy (fault tolerance). Choose this option only for non-critical data, because failure of just one physical disk will result in the loss of all data. RAID 1 RAID 1 uses disk mirroring so that data written to one physical disk is simultaneously written to another physical disk. This is recommended for small databases or other applications that do not require large capacity. RAID 1 provides full data redundancy, meaning that if one disk fails, the mirrored disk automatically maintains throughput with no data loss. Using Your RAID Enclosure 31