SAN Interview Questions and Answers
46. What are the main
constrains of SCSI in storage networking?
a) Deployment distance
(max. of 25 mts)
b) Number of devices that can be interconnected (16)
b) Number of devices that can be interconnected (16)
47. What is a Fabric?
Interconnection of
Fibre Channel Switches
48. What are the
services provided by Fabric to all the nodes?
a) Fabric Login
b) SNS
c) Fabric Address Notification
d) Registered state change notification
e) Broadcast Servers
b) SNS
c) Fabric Address Notification
d) Registered state change notification
e) Broadcast Servers
49. What is the
difference between LUN and WWN?
LUN: unique number
that is assigned to each storage device or partition of the storage that the
storage can support.
WWN: 64bit address that is hard coded into a fibre channel HBA and this is used to identify individual port (N_Port or F_Port) in the fabric.
50. What are the different topologies in Fibre Channel?
WWN: 64bit address that is hard coded into a fibre channel HBA and this is used to identify individual port (N_Port or F_Port) in the fabric.
50. What are the different topologies in Fibre Channel?
a) Point-to-Point
b) Arbitrary Loop
c) Switched Fabric Loop
b) Arbitrary Loop
c) Switched Fabric Loop
51. What are the layers
of Fibre Channel Protocol?
a) FC Physical Media
b) FC Encoder and Decoder
c) FC Framing and Flow control
d) FC Common Services
e) FC Upper Level Protocol Mapping
b) FC Encoder and Decoder
c) FC Framing and Flow control
d) FC Common Services
e) FC Upper Level Protocol Mapping
52. What is zoning?
Fabric management service that can be used to create logical subsets of devices within a SAN. This enables portioning of resources for management and access control purpose.
Fabric management service that can be used to create logical subsets of devices within a SAN. This enables portioning of resources for management and access control purpose.
53. What are the two
major classification of zoning?
Two types of zoning are
Two types of zoning are
a) Software Zoning
b) Hardware Zoning
b) Hardware Zoning
54. What are different
levels of zoning?
a) Port Level zoning
b) WWN Level zoning
c) Device Level zoning
d) Protocol Level zoning
e) LUN Level zoning
b) WWN Level zoning
c) Device Level zoning
d) Protocol Level zoning
e) LUN Level zoning
55. What are the 3
prominent characteristics of SAS Protocol?
a) Native Command
Queuing (NCQ)
b) Port Multiplier
c) Port Selector
b) Port Multiplier
c) Port Selector
56. What are the 5
states of Arbitrary Loop in FC?
a) Loop Initialization
b) Loop Monitoring
c) Loop arbitration
d) Open Loop
e) Close Loop
b) Loop Monitoring
c) Loop arbitration
d) Open Loop
e) Close Loop
57. How does FC Switch
maintain the addresses?
FC Switch uses simple name server (SNS) to maintain the mapping table
FC Switch uses simple name server (SNS) to maintain the mapping table
58. What is the purpose
of disk array?
Probability of
unavailability of data stored on the disk array due to single point failure is
totally eliminated.
59. What is disk array?
Set of high
performance storage disks that can store several terabytes of data. Single disk
array can support multiple points of connection to the network.
60. What is virtualization?
60. What is virtualization?
A technique of
hiding the physical characteristics of computer resources from the way in which
other system application or end user interact with those resources.
Aggregation, spanning or concatenation of the combined multiple resources into
larger resource pools.
61. What is Multipath
I/O?
Fault tolerant technique where, there is more than one physical path between the CPU in the computer systems and its main storage devices through the buses, controllers, switches and other bridge devices connecting them.
Fault tolerant technique where, there is more than one physical path between the CPU in the computer systems and its main storage devices through the buses, controllers, switches and other bridge devices connecting them.
62. What is RAID?
Technology that groups several physical drives in a computer into an array that you can define as one or more logical drive. Each logical drive appears to the operating system as single drive. This grouping enhances the performance of the logical drive beyond the physical capability of the drives.
63. What is stripe-unit-size?
It is data distribution scheme that complement s the way operating system request data. Granularity at which data is stored on one drive of the array before subsequent data is stored on the next drive of the array. Stripe unit size should be close to the size of the system I/O request.
64. What is LUN Masking?
A method used to
create an exclusive storage area and access control. And this can be achieved
by storage device control program.
65. What is the
smallest unit of information transfer in FC?
Frame
Frame
66. How is the capacity
of the HDD calculated?
Number of Heads X Number of Cylinders X Sectors per track X Sector Size
Number of Heads X Number of Cylinders X Sectors per track X Sector Size
67. What is bad block reallocation?
A bad sector is remapped or reallocated to good spare block and this information is stored in the internal table on the hard disk drive. The bad blocks are identified during the media test of the HDD as well as during various types of read write operations performed during the I/O tests. Apart from the new generation of HDD comes with a technology called BGMS (background media scan) which continuously scans the HDD media for defects and maps them when the drive is idle (this is performed after the HDD is attached to the system).
68. What are two types
of recording techniques on the tapes?
a) Linear Recording
b) Helical Scan Recording.
b) Helical Scan Recording.
69. What is snapshot?
A snapshot of data object contains an image of data at a particular point of time.
70. What is HSM?
Hierarchical storage management - An application that attempts to match the priority of data with the cost of storage.
Hierarchical storage management - An application that attempts to match the priority of data with the cost of storage.
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