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RAID Types and RAID levels
Hardware RAID:
This type of array manages RAID system independent of the host computer. Example of hardware RAID device will be that which connects to SCSI port and presents the RAID array as single SCSI device. An external RAID subsystem places the RAID controller on the external disk system. In this way the entire system connects to host using normal SCSI controller, appearing to host computer as single disk.
Software RAID:
This is cheaper solution as costly disk controller or hot swap cabinet is not required. Moreover the software RAID can work with IDE and SCSI disks both. We also can get better performance with software RAID if implemented with today’s latest and fast CPUs as its performance is dependent on the CPU performance and load.
RAID levels
There are various configurations of RAID such as: RAID 0, RAID 1, RAID 4, RAID 5, and linear.
RAID 0:
This level is also called disk striping without parity. This level includes two or more drives grouped together. The data being written to array is broken into strips and written across the member disks in array. RAID 0 does not provide data redundancy, i.e. if any disk or partition of array fails; you lose all the data in that array.
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