Datoptic RM16_EX8 User Manual
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45 RM16_EX8 User Guide v1.0 ‐ DATOptic.comour Redundant Flash Image feature, the controller will revert backto the last known version of firmware and continue operating. Thisreduces the risk of system failure due to firmware crash.Appendix FUnderstanding RAIDRAID is an acronym for Redundant Array of Independent Disks. Itis an array of multiple independent hard disk drives that provideshigh performance and fault tolerance. The SATA RAID controllerimplements several levels of the Berkeley RAID technology. Anappropriate RAID level is selected when the volume sets are de-fined or created. This decision should be based on the desired diskcapacity, data availability (fault tolerance or redundancy), anddisk performance. The following section discusses the RAID levelssupported by the SATA RAID controller.The RM16_EX8 raid engine makes the RAID implementation andthe disks’ physical configuration transparent to the host operatingsystem. This means that the host operating system drivers andsoftware utilities are not affected, regardless of the RAID levelselected. Correct installation of the disk array and the controllerrequires a proper understanding of RAID technology and theconcepts.APPENDIX166• RAID 0RAID 0, also referred to as striping, writes stripes of data acrossmultiple disk drives instead of just one disk drive. RAID 0 doesnot provide any data redundancy, but does offer the best highspeeddata throughput. RAID 0 breaks up data into smaller blocksand then writes a block to each drive in the array. Disk stripingenhances performance because multiple drives are accessedsimultaneously; the reliability of RAID level 0 is less because theentire array will fail if any one disk drive fails.• RAID 1RAID 1 is also known as “disk mirroring”; data written on onedisk drive is simultaneously written to another disk drive. Readperformance will be enhanced if the array controller can, in parallel,access both members of a mirrored pair. During writes, therewill be a minor performance penalty when compared to writingto a single disk. If one drive fails, all data (and software applications)are preserved on the other drive. RAID 1 offers extremelyhigh data reliability, but at the cost of doubling the required datastorage capacity.167APPENDIX• RAID 10(1E)RAID 10(1E) is a combination of RAID 0 and RAID 1, combingstripping with disk mirroring. RAID Level 10 combines the fastperformance of Level 0 with the data redundancy of Leve1 1. Inthis configuration, data is distributed across several disk drives,similar to Level 0, which are then duplicated to another set of |
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