RAID

Question 1
A read bit can be read
A
and written by CPU
B
and written by peripheral
C
by peripheral and written by CPU
D
by CPU and written by the peripheral
       Computer-Organization       RAID       ISRO-2007
Question 1 Explanation: 
The read and write functionality depends on the type of microcontroller peripheral. Generally, the status bits have a read only status and can be modified by peripherals only. So, read bit can be read by CPU and written by the peripheral.
Question 2
Which of the following RAID level provides the highest Data Transfer Rate (Read/Write)
A
RAID 1
B
RAID 3
C
RAID 4
D
RAID 5
       Operating-Systems       RAID       ISRO-2007
Question 2 Explanation: 
Disk mirroring, also known as RAID 1, is the replication of data to two or more disks. Disk mirroring is a good choice for applications that require high performance and high availability, such as transactional applications, email and operating systems.
Question 3
Which one of these is characteristic of RAID 5?
A
Dedicated Parity
B
Double Parity
C
Hamming code Parity
D
Distributed Parity
       Computer-Organization       RAID       ISRO-2017 May
Question 3 Explanation: 
RAID 0: Disk Striping or non-redundant striping
RAID 1: Disk Mirroring
RAID 2: Memory style error correcting codes
RAID 3: Bit interleaved parity
RAID 4: Block interleaved parity
RAID 5: Block interleaved distributed parity
RAID 6: P+Q redundancy
Question 4
Raid configurations of the disks are used to provide
A
Fault-tolerance
B
High speed
C
High data density
D
A & B
       Operating-Systems       RAID       ISRO CS 2008
Question 4 Explanation: 
RAID stands for Redundant Array of Independent Disks. A RAID-enabled system uses two or more hard disks to improve the performance and provide some level of fault tolerance for a machine.
Question 5
Which RAID level gives block-level striping with double distributed parity?
A
RAID 10
B
RAID 2
C
RAID 6
D
RAID 5
       Operating-Systems       RAID       ISRO CS 2011
Question 5 Explanation: 
RAID (Redundant Array of Inexpensive Disks or Drives, or Redundant Array of Independent Disks) is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.
RAID levels and their corresponding functionality as shown below
RAID 0: Stripping
RAID 1: Mirroring
RAID 2: Hamming code for error detection
RAID 3: Byte-level striping with a dedicated parity disk
RAID 4: Block-level striping with block-level striping with two parity blocks parity
RAID 5: Block-level striping with distributed parity
RAID 6: Block-level striping with double distributed parity.
Question 6
Which level of RAID refers to disk mirroring with block striping?
A
RAID level 1
B
RAID level 2
C
RAID level 0
D
RAID level 3
       Computer-Organization       RAID       Nielit Scientific Assistance IT 15-10-2017
Question 6 Explanation: 
● The standard RAID levels comprise a basic set of RAID (redundant array of independent disks) configurations that employ the techniques of striping, mirroring, or parity to create large reliable data stores from multiple general-purpose computer hard disk drives (HDDs).
●RAID 0: Stripping
● RAID 1: Mirroring
● RAID 2: Hamming code for error detection
● RAID 3: Byte-level striping with a dedicated parity disk
● RAID 4: Block-level striping with block-level striping with two parity blocks parity
● RAID 5: Block-level striping with distributed parity
● RAID 6: Block-level striping with double distributed parity.
Question 7
Which level of RAID refers to disk mirroring with block striping?
A
RAID level 1
B
RAID level 2
C
RAID level 0
D
RAID level 3
       Computer-Organization       RAID       Nielit Scientific Assistance CS 15-10-2017
Question 7 Explanation: 
RAID is a technology that is used to increase the performance and/or reliability of data storage.
Following are the various RAID levels:
RAID 0: Stripping
RAID 1: Mirroring
RAID 2: Hamming code for error detection
RAID 3: Byte-level striping with a dedicated parity disk
RAID 4: Block-level striping with block-level striping with two parity blocks parity
RAID 5: Block-level striping with distributed parity
RAID 6: Block-level striping with double distributed parity.
There are 7 questions to complete.
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