Redundancy: Raid and Large Logical Disk

Topics: RAID, Standard RAID levels, Meaning of life Pages: 1 (304 words) Published: January 23, 2014
1. What does RAID mean?
RAID mean Redundant Array of Independent Disks or Redundant Array of Inexpensive Disks. 2. When would we use RAID?
RAID can be used when there’s a lot of important data that we are constantly changing and need to back up often. 3. Define the following types of RAID:
a. RAID 0- Has Stripped Blocks and has no Redundancy. Has to have two disks b. RAID 1- Is a mirrored blocks and is the best performance of the four because it isn’t striped and has no parity. It also needs two drives. c. RAID 5- It has striped blocks that spreads across three or more disks. d. RAID 6- RAID 6 is RAID 5 except it can recover from two failed disk. 4. Why is RAID 0 of any use if it offers no redundancy?

It can be of use to improve performance through concurrent access and or create large logical disk out of multiple physical disks. 5. Why do you think that RAD 1 can be the most expensive? Why would people utilize it if it’s so costly? RAID 1 is expensive because its disk overhead requires all of its drives to be running. It’s also 100% redundancy meaning that data will not be lost. 6. If you, as a home computer user, were to purchase a form of RAID, which would you choose and why? I would choose RAID 1 because it makes a mirror file on a second disk and also because it increases the safety of both disk. Plus it can also depend on what purpose I would need it for. 7. What is the difference between software RAID and hardware RAID? The difference between software RAID and hardware RAID are:

Hardware RAID requires specialized hardware to handle the drivers unlike Software RAID. Software RAID takes ups a portion of the host processor unlike hardware RAID.
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