RAID Implementations

a. What will be the storage capacity of our system is we are using:

i. RAID 0

ii. RAID 1

iii. RAID 5

iv. RAID 6

v. Raid 50 with 2 raid 5 sets

vi. Raid 10

b. How many disks can fail without losing data if we are using

i. Raid 0

ii. Raid 1

iii. Raid 5

iv. Raid 6

v. Raid 50 with 2 raid 5 sets

vi. RAID 10

2. Which RAID type or types would you recommend in the following situations:

a. Storage of database files and transaction logs for a crucial database where the primary server room is in an earthquake prone area.

b. Storage of a large archive of pictures and videos that will not change, but where rapid reading of the files is critical.

c. Storage of a large volume of files of varied types where there is a moderate amount of updating of the data where:

i. The system will require 3 Terabytes of storage and we are planning to use 750 GB drives in our RAID array

ii. The system will require 6 Terabytes of storage and we are planning to use 500 GB drives in our RAID array

3. Indicate the values of the missing bits. Assuming each row represents a set of corresponding blocks across the 4 disks and we are writing a block to 3 of the disks and parity data to the 4th with rotation of the disk writing the parity bit. Disk 3 died and we must reproduce its contents. Indicate The values required:

a. Parity bits for 1st block __ __ __ __

b. Reconstructed data for block 2 __ __ __ __

RAID 5