Chapter 9 Mass Storage Structure Flashcards
Explain the minumium requirements for RAID 0.
requires at least two disks to stripe data across them. There is no redundancy,
What are the surface of the platters logically divided into ?
Tracks
Explain the minumium requirements for RAID 6.
RAID 6 needs at least four disks, as it extends RAID 5 by adding a second parity block. This allows for the system to tolerate two simultaneous disk failures, providing enhanced reliability.
What is the time necessary to move the disk arm to the desired cylinder ?
Seek time
What part of a disk is a flat and cirular shaped ?
disk platter
Explain how the alg chooses requests and what some pros and cons are: FCFS Scheduling (first come first serve)
easy, but not very fast. Goes in order of the queue
What is a large one-dimensional array. Smallest unit of transfer. Size usually 512 bytes ?
Logical block
Explain the minumium requirements for RAID 4.
RAID 4 also requires a minimum of three disks. It uses block-level striping with a dedicated parity disk to provide fault tolerance.
Explain the minumium requirements for RAID 3.
RAID 3 needs at least three disks: two for data and one for parity. It uses bit-level striping and a single parity disk for error correction.
Explain the minumium requirements for RAID 2.
RAID 2 requires a minimum of three disks, as it uses bit-level striping with ECC. At least one disk is needed for ECC information to detect and correct errors.
What are the two differnt types of disk storages ?
host-attached storage
Network attached storage
What is the rate at which data flows between the drive and the computer ?
Transfer rate
How are tracks subdivided ?
Sectors
What part of a disk is responsible for moving all heads as a unit ?
disk arm
Explain the minumium requirements for RAID 5.
RAID 5 requires at least three disks to distribute both data and parity information across all disks in the array, offering a balance of performance, storage efficiency, and reliability.
