TRUE/FALSE 6) Most RAID systems, except Level 0, are more reliable than single d
ID: 3707449 • Letter: T
Question
TRUE/FALSE
6) Most RAID systems, except Level 0, are more reliable than single disk due to their interleave data striping schemes with redundancy and parity.
7) An I/O interrupt is a hardware-generated signal to the processor.
8) Priority scheduling is a type of preemptive dispatching, since high-priority processes can take resources away from low-priority processes.
9) RAID is a set of physical disk drives viewed by the operating system as a single logical drive.
10) With isolated I/O there is a single mutually accessible address space for memory locations and I/O devices.
Explanation / Answer
The answers are given below.
Answer:6)
Most RAID systems, except Level 0, are more reliable than single disk due to their interleave data striping schemes with redundancy and parity.
Answer: (TRUE)
CAUSE:
As RAID (Redundant Array of Independent/Inexpensive Disks) where data striping is implied for enhancement of faster speed of system’s performance by distributing data over multiple disks parallel order.
Due to data striping and redundancy over multiple disks in spite of single disk the overall performance ,cost and reliability are been improved .
RAID levels:
Level 0 (Non redundant): Data striping is implied in a parallel manner, without any redundant data storing.
Level 1 (Mirroring/Shadowing): where each disk can keep two copies of data
Level 2 (ECC (Error Correcting Codes)): Here hamming Codes are used to detect and correct error.
Level 3 (Bit-Interleaved Parity): Single disk is required to store parity data(bit size/byte size).
Level 4 (Block-Interleaved Parity): Across multiple disks are interleaved to store parity data of block size as a striping unit.
Level 5 (Block-Interleaved Distributed-Parity):Block size Parity data are distributed among multiple disks of the system.
Level 6 : It is required for only error-correction if major failure is happened on two disks.
Answer: 7)
An I/O interrupt is a hardware-generated signal to the processor.
Answer:(TRUE)
CAUSE:
In case of system programming, an I/O interrupt is a hardware or software generated signal to the processor for alerting to take necessary action rather interruption with a high priority requirement to the running program of the processor at the time of execution.
Answer:8)
Priority scheduling is a type of preemptive dispatching, since high-priority processes can take resources away from low-priority processes.
Answer:(FALSE)
CAUSE:
Priority scheduling is a type of non-preemptive dispatching scheduling algorithm of a batch processing systems where high-priority processes can take resources away from low- priority resources executed in a (FCFS) first come first serve manner.
Answer:9)
RAID is a set of physical disk drives viewed by the operating system as a single logical drive.
Answer:( TRUE)
CAUSE:
RAID is a set of multiple physical disks viewed by the operating system as a single logical drive where data are distributed with redundancy over multiple disks in a parallel order to be prioritized.
Answer:10)
With isolated I/O there is a single mutually accessible address space for memory locations and I/O devices.
Answer: (TRUE)
CAUSE:
In case of Isolated I/O there is a separate accessible address space for primary memory and device memory for I/O devices.
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