More than 40 interview questions on storage,san,nas,FC:Thanks Jai for this contribution

I want to thank Jai one of our blog reader who has contributed more than 58 interview questions from his experience of attending real storage interviews.

In the last 2 posts we had more than 30 interview questions posted which can be accessed through the below links
interview questions Series 1
interview questions Series 2

Here you get 10 more interview questions for storage area networking
31) What are tow types of recording techniques on the tapes?
a) Linear Recording
b) Helical Scan Recording.

32) What is snap shot?
A snapshot of data object contains an image of data at a particular point of time.

33) What is HSM?
Hierarchical storage management, an application that attempts to match the priority of data with the cost of storage.

34) What is hot-swapping?
Devices are allowed to be removed and inserted into a system without turning off the system.

35) What is Hot-Sparing?
A spare device is available to be inserted into the subsystem operation without having to remove and replace a device.

36) What are different types of backup system?
a) Offline
b) Online
c) Near Line

37) What is the different between mirroring, Routing and multipathing?

Redundancy Functions Relationships Role
Mirroring Generates 2 i/os to 2 storage targets Creates 2 copies of data
Routing Determined by switches independent of SCSI Recreates n/w route after a failure
Multipathing Two initiator to one target Selects the LUN initiator pair to use

38) Name few types of Tape storage?
a) Digital Linear Tape
b) Advanced Intelligent Tape
c) Linear Tape Open

39) What is a sequence in FC?
Group of one or more frames that encompasses one or more “information units” of a upper layer protocol.

Example:
It requires
i) One sequence to transfer the command
ii) One or more sequence to transfer the data
iii) Once sequence to transfer the status.

40) What is Exchange in FC?
Exchange is to establish a relationship between 2 N_PORTs and then these two ports transfer data via one or more sequence within this relationship.
Example: Exchange exist to transfer the command, data and the status of one SCSI task