I need help with these questions: Please provide a step by step explanation on t
ID: 3725565 • Letter: I
Question
I need help with these questions:
Please provide a step by step explanation on the calculation
Given two (2) 500 GB hard drives configured as RAID Level 0, how much usable drive space exists?
Given two (2) 500 GB hard drives configured as RAID Level 1, how much usable drive space exists?
Given three (3) 500 GB hard drives configured as RAID Level 5, how much usable drive space exists?
Which RAID Level (0, 1 or 5) would create the maximum amount of usable drive space and provide data redundancy and fault tolerance?
Thanks
Explanation / Answer
RAID - Redundant Array of Inexpensive disc
Case 1 : Two (2) 500 GB hard drives configured as RAID Level 0
Raw Storage: 1.0 TB / 1000.0 GB
Usable Storage: 1.0 TB / 1000.0 GB (Practically - 0.9 TB / 931.3 GB Approx.)
RAID0 offers no redundancy, all disks are utilized for storage, and requires at least two drives to be used.
Speed gain : 2x read and write speed gain
Fault tolerance : None
Case 2 : Two (2) 500 GB hard drives configured as RAID Level 1
Raw Storage: 1.0 TB / 1000.0 GB
Usable Storage: 0.5 TB / 500 GD (Practically - 0.5 TB / 465.7 GB)
RAID1 Mirrors your data from one disk to the other disk for redundancy (2 Disks Maximum)i.e. Double Data redundancy
Speed gain : Up to 2x read speed, no write speed gain
Fault tolerance : 1-drive failure
Case 3 : Three (3) 500 GB hard drives configured as RAID Level 5
Raw Storage: 1.5 TB / 1500.0 GB
Usable Storage: 1 TB / 1000 GB (Practically - 0.9 TB / 931.3 GB)
RAID5 uses one disk for Parity and requires at least three drives to be used.
Speed gain : 2x read speed, no write speed gain
Fault tolerance : 1-drive failure
All parameters already stated.
Note : Usable storage varies practically because the actual post-format amount where kilo = 1024, not 1000
RAID 0 would create the maximum amount of usable drive space.
RAID 1 would provide data redundancy and fault tolerance