Assignmtne 6

What is the difference between block oriented I/O devices and stream oriented I/O devices. Give an modelling of each.
Block-oriented device stores information in blocks that are usu every(prenominal)y of unyielding size, and transfers are made champion block at a time. An example is USB keys.
Stream-oriented device transfers information in and out as a stream of bytes, with no block structure. An example is printers.

What handgrip elements are involved in a disk strike or write?
A Rotational delay

Briefly recognize the 7 RAID levels.
RAID Level 0 is non-redundant, when info is distri howevered over all disks in array. Data is striped roofy robin over consecutive disks, and all information on all disks will be lost if any one disk fails.

RAID Level 1 is mirrored. It happens when all the data is duplicated. The data requests can be serviced by either of twain disks and all writes must occur twice.

RAID Level 2 is redundancy through Hamming code. Level 2 is a parallel access technique. All disks execute for each I/O request or synchronized. Hamming code employ to correct single dapple and detect double bit errors. Required fewer disks than Level 1.

RAID Level 3 is bit-interleaved parity. Level 3 is a single redundant disk, no matter how large the disk array. The parallel access and data distributed in small strips.



check bit bit computed for bits in resembling position on all disks.

RAID Level 4 - is block-level parity. In Level 4 each array operates independently. Parity bit computed for bits in same position on all disks.

RAID Level 5 is block-level distributed parity. Which is similar to Level 4, but parity distributed across all disks. This helps avoids the potential I/O bottleneck of the single parity disk found in Level 4.

RAID Level 6 is dual redundancy. deuce different parity calculations are carried out and stored in calve blocks on different disks. Level 6 provides extremely high-pitched data availability.

List and briefly define five institutionalise organizations.
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