RAID Q & A PAGE - 1

     RAID INTERVIEW QUESTIONS AND ANSWERS

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1..What is RAID?

RAID means Redundant Array of Independent Disks configuration to further protect against multiple failures

2..Does Linux Support Virtualized File Systems Like RAID?

The most recent Linux kernels support software RAID, and they will work with RAID disk controllers

3..What is software RAID?

Software RAID means that an array is managed by the kernel, rather than by specialized hardware

4..What is hardware RAID?

Hardware RAID means that arrays are managed by specialized disk controllers that contain RAID firmware

5..Some disk controllers internally support RAID and can manage disks without the help of the CPU

6..What are the different RAID levels?

There are total 10 types of RAID levels:

RAID level 0

RAID level RAID level 1

RAID level 2

RAID level 3

RAID level 4

RAID level 5

RAID level 6

RAID level 10

RAID level 50

RAID level 0+1

7..What are all the  different capabilities in the hardware and software  levels IN RAID?

RAID-0

Often called stripe mode, volumes are created in parallel across all of the devices that are part of the RAID array, allocating storage from each in order to provide as many opportunities for parallel reads and writes as possible.

RAID-1

known as mirroring, volumes are created on single devices and exact copies (mirrors) of those volumes are maintained in order to provide protection from the failure of a single disk through redundancy.

RAID-4

RAID-4 is a fairly uncommon RAID level that requires three or more devices in the RAID array.

RAID-5

One of the most popular RAID levels, RAID-5 requires three or more devices in the RAID array and enables you to support mirroring through parity information without restricting the parity information to a single device

RAID-10

A high-performance modern RAID option, RAID-10 provides mirrored stripes, which essentially gives you a RAID-1 array composed of two RAID-0 arrays.

8..Why we want  to use RAID?

System Administrators and others who manage large amounts of data would benefit from using RAID technology.

Enhances speed
Increases storage capacity using a single virtual disk 
Minimizes disk failure

9..What are the commonly used RAID types?
RAID 0
RAID 1
RAID 5

10..How to check which disk is fault in hardware Raid level?
#  watch cat/proc/mdstat  

11..Can  we use LVM with  RAID?

We can also redirect the log files path, so we can store log files on any other partition or on any other system