Topic D3-Install and Configure RAID
You are configuring four 120 GB drives in a RAID 5 array. How much space will be available?
360 GB.
If you have a computer with three hard disks, what type of RAID fault tolerant configuration will make best use of them?
RAID 5 (striping with parity); RAID 0 is not fault-tolerant and RAID 1 and RAID 10 require an even number of disks.
What is RAID?
Redundant Array of Inexpensive Disks (RAID),
A user reports that some of his folders have begun disappearing and some folder and file names are scrambled with strange characters in their names. What is the most likely cause of the problem?
a virus, a bad hard
A user has reported that her computer cannot boot and is getting an error message at POST. Diagnose and correct the issue. a) Reproduce the problem by booting the computer and observing the error. Listen to determine if the drive is spinning up during POST. b) Access the firmware setup program to check that the drive port is enabled. c) Power off the computer, disconnect any cabling, and then open the case. Verify that the drive data cable and power cable are properly connected. d) If nothing else corrects the problem, replace the drive.
A
A RAID utility reports that the volume is degraded. What should you do? A degraded volume is still working but has lost one of its disks.
Back up and replace
When a user tries to access the hard drive containing his data, the system locks up and makes a clicking sound. From the command prompt, he can change to drive D, but when he tries to access a file or list the files on the drive, it locks up and begins clicking again. What is the most likely cause of the problem?
Bad hard drive
RAID 10 (1+0)
Combo of RAID 0 (Disk stripping) and RAID 1 (Mirroring). has redundancy, requires four discs and must always be an even number of discs, A logical striped volume is configured with two mirrored arrays
RAID 0
Disk stripping, no redundancy, requires two disks, data is divided into two blocks and spread in a fixed order among all disks
What does RAID do?
Many hard disks can act as backups for each other to increase reliability and fault tolerance, or they can act together as one very large drive
RAID 1
Mirroring, has redundancy, requires two hard disks, Mirror disk is the duplicate of the data disc. If one disc fails data is on the other disc
What is the minimum number of disks required to implement RAID 10 and how much of the disks' total capacity will be available for the volume?
RAID 10 requires at least four disks (two mirrored pairs) and comes with a 50% capacity overhead so the volume will only be half the total disk capacity.
Raid 5
Striping with Parity, has redundancy, requires at least three drives, stripes the data and adds a parity across the discs so that data can be reconstructed
Another user has reported that there are grinding noises coming from her computer case. Once you take a closer look, you suspect that it is the hard drive. What is the possible cause and solution to this type of issue?
The hard drive is physically damaged, A virus has attacked the hard drive, Data is corrupt on the drive,