Using the following descriptions, list all the RAID levels that would be conside
ID: 3688855 • Letter: U
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Using the following descriptions, list all the RAID levels that would be considered appropriate for the description. Explain/defend your choices (your defense is more important than the choice) a. Disks holding the primary server Operating System. b. Large amounts of user data saved, considered extremely important. Speed when accessing the data is extremely important. User data (nominal amounts) - considered important (can't be lost), but speed/access isn't a critical factor Large amounts of user data (considered important), many extra disks, some old, system needs to be able to handle (any) disk failure(s). Speed/access is important. High speed system - data loss is not critical factor, but high speed processing and access to data is paramount. c. d. e.Explanation / Answer
A) RAID 0 - Requires Minimum 2 disks. Provides Excellent performance ( as blocks are striped ). but provides No redundancy ( no mirror, no parity ). If downtime can be afforded , can use RAID 0 to install operating system but considering any crictical system where downtime cannot be think of, than in that case consider RAID 1 or RAID 5.
Another Costly option is to go for RAID 10 - Blocks Mirrored ( and Blocks Stripped )
B) RAID 1 because it synchronously mirror all data from each HDD to exactly duplicate HDD and it requires Minimum 2 disks .It provides Good performance ( no striping. no parity ) and Excellent redundancy ( as blocks are mirrored ). Typically Highest performing RAID but less on usable capacity
C) RAID 5 because its the Best cost effective option providing both performance and redundancy. Use this for DB that is heavily read oriented. Write operations will be slow. It provides maximum storage space 1/n , where n = number of disks along with Good redundancy ( distributed parity ) and Good performance ( as blocks are striped ).
Minimum 3 Disks are required for this .
Can consider RAID 6 also and the the added advantage is that it can sustain 2 drive failures instead of 1and can be achieved again with the help of parity.Double distributed parity is used to achieve this level of redundancy,
D) RAID 1 As the Availability of Disk is not a problem and can use any number of disks to protect data and achieve performance .Synchronously mirror all data from each HDD to exactly duplicate HDD and it requires Minimum 2 disks .It provides Good performance ( no striping. no parity ) and Excellent redundancy ( as blocks are mirrored ). Typically Highest performing RAID but less on usable capacity
e) RAID 0: Provides good performance but no redundancy and Data loss is not critical but performance is must .
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