Data Storage Technologies and Networks

1. Wear leveling affects
Select one:

•  Hard disk
•  Flash  
•  Optical storage
•  RAM

The correct answer is: Flash


Question 2

Without power down a machine how to remove hard drives?
Select one:

•  fast booting
•  hot swapping  
•  drive duplexing
•  drive mirroring

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Your answer is correct.
The correct answer is: hot swapping


Question 3

Do iSCSI storage mandatory to required switch?
Select one:

•  Yes
•  No  
•  None
•  a & b both

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Your answer is correct.
The correct answer is: No


Question 4

Estimate the sustained transfer rate of a drive if disk drive spins at 7200 RPM, has a sector size of 512 bytes, and holds 160 sectors per track around
Select one:

•  9400 KB/s
•  9600 KB/s  
•  9800 KB/s
•  10000 KB/s

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Your answer is incorrect.
The correct answer is: 9800 KB/s



Question 5

A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple (c, h, s), where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0th sector is addressed as (0, 0, 0), the 1st sector as (0, 0, 1), and so on
The address <400,16,39> corresponds to sector number:

Select one:

•  505035
•  505036
•  505037  
•  505047

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Your answer is correct.
The correct answer is: 505037


Question 6

If MTTF of  a disk is 80000hrs what us MTTF of an array of 8 disks
Select one:

•  640000 hrs  
•  10000 hrs
•  80000 hrs
•  40000 hrs

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Your answer is incorrect.
The correct answer is: 10000 hrs



Question 7

Best I/O Technique for low volume data transfer
Select one:

1.  Polling
2.  Interrupt Driven
3.  DMA  
4.  b and c

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Your answer is incorrect.
The correct answer is: Interrupt Driven


Question 8

How many disk failure can disk failure can be withstood by RAID 6?
Select one:

•  1
•  2  
•  3
•  4

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Your answer is correct.
The correct answer is: 2


Question 9

Identify a network file protocol in the below mentioned set
Select one:

•  FC
•  CIFS  
•  SCSI
•  NAS

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Your answer is correct.
The correct answer is: CIFS


Question 10

A computer has a single cache with a hit time of 4 ns and hit rate is 90%. Main memory has a 35 ns access time. What is the computer’s effective access time?
Select one:

•  5 ns
•  7.5 ns  
•  5.75 ns
•  6 ns

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Your answer is correct.
The correct answer is: 7.5 ns


Question 11

Which of the following RAID levels guarantees double disk failure protection?
Select one:

•  Raid 5
•  Raid 6  
•  Raid 0+1
•  Raid 1+0

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Your answer is correct.
The correct answer is: Raid 6



Question 12

What is the capacity of the disk with 5 platters. 2 surfaces per platter, 20000 tracks per surface, 300 sectors per track and 512 bytes per sector
Select one:

•  30.72GB  
•  24.40GB
•  21.40GB
•  15.16GB

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Your answer is correct.
The correct answer is: 30.72GB


Question 13

Which storage Technology uses low level disk drive access commands like READ block, WRITE block and READ capacity
Select one:

•  NAS  
•  SAN
•  DAS
•  All the above

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Your answer is incorrect.
The correct answer is: SAN


Question 14

How do we meet memory bandwidth requirements?

Select one:

•  L1 cache, L2 cache and DRAM  
•  Direct Attached Storage and Network Storage
•  Archival Storage
•  All the above

Feedback
Your answer is incorrect.
The correct answer is: All the above


Question 15

If average latency is 2.99 ms and average seeks time is 4.7 ms, then IOPS of the disk will be?
Select one:

•  129
•  130  
•  128
•  131

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Your answer is correct.
The correct answer is: 130



Question 16

Which of the following model makes the server to keep track of cached copies and notifies them on update

Select one:

•  Asynchronous writing model  
•  Cache verification model
•  Callback model
•  Leasing model

Feedback
Your answer is incorrect.
The correct answer is: Callback model


Question 17

What level of RAID supported by some NAS systems?
Select one:

•  RAID-6
•  RAID-10
•  RAID-5
•  None  

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Your answer is incorrect.
The correct answer is: RAID-6



Question 18

If read and write performance is the only criterion, which would you choose?
Select one:

•  RAID 0  
•  RAID 1
•  RAID 5
•  RAID 50

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Your answer is correct.
The correct answer is: RAID 0



Question 19

Which version of NFS Mandates strong security
Select one:

1.  NFSv1
2.  NFSv2
3.  NFSv3
4.  NFSv4  

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Your answer is correct.
The correct answer is: NFSv4


Question 20
PCI Bus Lines contains
Select one:

•  Control Lines
•  Data Lines
•  Address Lines
•  All the above  

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Your answer is correct.
The correct answer is: All the above