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RAID level 1 is called mirroring because it maintains an identical twin of the first drive Since all data that is written to disk 1 (original disk) is also written to disk 2 (shadow disk), disk utilization is only 50 percent There is also a slight write performance loss
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due to the overhead of writing to two drives However, there is a performance gain on disk reads and there is very good fault tolerance To eliminate the single point of failure here, you can use two controller cards, each responsible for writing to a single disk This completely duplicates the I/O system and is called duplexing You should use mirroring if you Require a high level of redundancy Demand high read performance Do not want to deal with the complexity of other RAID systems
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Level 2 RAID uses striping (like RAID 0), but it is performed at the bit level This method of writing data to the disk requires a good deal of CPU processing and is inefficient It is thus not adopted and there are no commercially available RAID 2 solutions
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Level 3 RAID uses byte striping similar to level 0 but includes a drive dedicated for parity The parity can be thought of as the sum of all the bytes contained in the stripes of the other disks The parity disk provides true fault tolerance because if any of the other drives fail, the information on it can be calculated by subtracting the bytes in the other stripes from the parity stripe The capacity of RAID level 3 arrays can be expressed as a percentage: n-1/n where n is the total number of drives Since all disks are involved in every read or write (to calculate the parity stripe), RAID level 3 arrays can process only one transaction at a time They are not suited for random access of many small data blocks These systems are best suited for large sequential requests, but it s pretty rare that you ll ever see this
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Level 4 RAID uses striping at the block level to improve efficiency Otherwise it dedicates a drive to the parity information like level 3 RAID, and thus has the same capacity of RAID level 3 systems
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Level 5
A popular RAID configuration is level 5 RAID Here the parity is stored in 64k blocks and placed evenly on all drives Since the controller can process multiple writes in parallel across the array, RAID level 5 can outperform levels 3 and 4 It doesn t perform as well as level 0 or 1, however, because of the computation used to calculate the parity information The capacity of RAID level 5 is the same as levels 3 and 4 and should be considered when redundancy is required but you do not have the money for a mirrored solution or if you require the overall larger capacity afforded by arrays as opposed to single, mirrored drives
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Advanced Levels
RAID level 10 is a striped array that is mirrored This configuration provides excellent fault tolerance and a performance boost Any single drive in each array or an entire array can fail without data loss The capacity is reduced to 1-n/2n for every n drives RAID level 55 requires three RAID 5 arrays that are combined into one larger RAID 5 array Just replace each drive in RAID 5 with an array of drives each with its own controller, and you have massive capacity, excellent performance, and nearly perfect redundancy The ratio of total usable space is the same as in RAID 5 systems (1-n/n)
The host bus adapter (HBA) is used to connect a server or workstation to a network or storage device Host bus adapters can be used to connect multiple different devices such as Fibre Channel, iSCSI, and ESATA With iSCSI becoming increasingly popular, an iSCSI HBA has been developed that is similar to an Ethernet NIC, but has a dedicated TCP offload engine to increase iSCSI performance When you hear people speak or write about an HBA, they are generally referring to the Fibre Channel type of host bus adapter Similar to an Ethernet NIC, the HBA has a unique identifier called a World Wide Name (WWN) The HBA is connected to a Fibre Channel switch, which is connected to the disk controller From the switch, a zone is created and the WWN of the host system is granted access to disk resources on the disk controller Like a Fibre Channel switch, HBAs support speeds of 2, 4, or 8 Gbps
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