Question

a) RAID is a method to create live backups of physical hard disks but creating RAID will decreases the usable capacity of the hard drive. Would you prefer to have backup at the cost of half of your disk space? What type of RAID would be better for a home based computer setup that has frequent power failures that could cause hard disk failures?

Answer 1

Answer:Answer:

RAID 1 (YES !)

Explanation

RAID 1 have the disadvantage of disk space but over all its the best Option in the times of power failure .because remaining RAID does not support for a quick back up as RAID 1.

Advantages of RAID 1

1. RAID 1 offers excellent read speed and a write-speed that is comparable to that of a single drive.
2. In case a drive fails, data do not have to be rebuild, they just have to be copied to the replacement drive.
3. RAID 1 is a very simple technology.

Disadvantages of RAID 1

1. The main disadvantage is that the effective storage capacity is only half of the total drive capacity because all data get written twice.
2. Software RAID 1 solutions do not always allow a hot swap of a failed drive. That means the failed drive can only be replaced after powering down the computer it is attached to. For servers that are used simultaneously by many people, this may not be acceptable. Such systems typically use hardware controllers that do support hot swapping.
3. Ideal use

RAID-1 is ideal for mission critical storage, for instance for accounting systems. It is also suitable for small servers in which only two data drives will be used.

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