What is the host controller?

• A. Controller built at the end of each disk
• B. Controller at the computer end of the bus
• C. All of the mentioned
• D. None of the mentioned

______ controller sends the command placed into it, via messages to the _____ controller.

• A. Host, host
• B. Disk, disk
• C. Host, disk
• D. Disk, host

What is the disk bandwidth?

• A. The total number of bytes transferred
• B. Total time between the first request for service and the completion on the last transfer
• C. The total number of bytes transferred divided by the total time between the first request for service and the completion on the last transfer
• D. None of the mentioned

RAID level 3 supports a lower number of I/Os per second, because _______________

• A. Every disk has to participate in every i/o request
• B. Only one disk participates per i/o request
• C. I/o cycle consumes a lot of cpu time
• D. All of the mentioned

RAID level _____ is also known as block interleaved parity organisation and uses block level striping and keeps a parity block on a separate disk.

• A. 1
• B. 2
• C. 3
• D. 4

A performance problem with _________ is the expense of computing and writing parity.

• A. Non-parity based raid levels
• B. Parity based raid levels
• C. All raid levels
• D. None of the mentioned

In RAID level 4, one block read, accesses __________

• A. Only one disk
• B. All disks simultaneously
• C. All disks sequentially
• D. None of the mentioned

The overall I/O rate in RAID level 4 is ____________

• A. Low
• B. Very low
• C. High
• D. None of the mentioned

A write of a block has to access ____________

• A. The disk on which the block is stored
• B. Parity disk
• C. A parity block
• D. All of the mentioned

RAID level 5 is also known as ____________

• A. Bit-interleaved parity organization
• B. Block-interleaved parity organization
• C. Block-interleaved distributed parity
• D. Memory-style ecc organization