Posted: November 5th, 2015

RAID Implementations

RAID Implementations

CIS 320 Pencil & Paper Homework 6: RAID Implementations
1.    We have 8 disks each with a capacity of 1 Terabyte which we plan to use for storage in a RAID array
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 __ __ __ __

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