What Type of RAID do you use at server , What is the essentials problems you meet and what is the real different between RAID and LVM ,with examples ?

RAID is used for Redundancy because Redundance provides the fault Tolarance and diffrent RAID levels doing this accouding to the need.

LVM is software level, so no data protection(redundancy), It is mainly used to manage logical volumes and disks in Linux environtment. 

RAID1 and RAID5

RAID and LVM are two concepts of storing data. Difference in these two is the way the data is stored.

 RAID is basically used for redundancy.LVM on the other hand provides more more disk space at any point .(you can increase the FS space by adding more disks at run time)

I'm use RAID 5 becouse give me best scenario to no fault of tolerance for my data and simple to migrate and restore from hardware to another 

In normal case I use RAID-5 in my servers as best scenario and if hardware resourse are limited I use RAID-1

It gives best hardware level redundacny with minimum 3 hard drives needed in RAID-5.   

while LVM is usrd in Linux and it a software and OS based Fault  tolerance

RAID V/S LVM

 A RAID device is a physical grouping of disk devices in order to create a logical presentation of one device to an Operating System for redundancy or performance or a combination of the two.RAID is NOT any kind of Data backup solution. Its a solution to prevent one of the SPOFs (Single Point of Failure) i.e. DISK failure. By configuring RAID you are just providing an emergency substitute for the Primary disk. It NEVER means that you have configured DATA backup.

V/S

 LVM is a software tool to manage large pool of storage devices making them appear as a single manageable pool of storage resource. LVM can be used to manage a large pool of what we call Just-a-bunch-of-Disk (JBOD) presenting them as a single logical volume and thereby create various partitions for software RAID. LVM is a logical layer that that can be anipulated in order to create and, or expand a logical presentation of a disk device to an Operating System.

We uae RAID 5 and RAID 60 (on HP Server). There are no issues except we might tend to loose some storgae space because of RAID parity.

The differences are,

RAID(5 /10/60 /1) , it provide data protection(redundancy), w can run server even if one or more disks fails(Hardware level RAID).

LVM is software level, so no data protection(redundancy), It is mainly used to manage logical volumes and disks in Linux environtment.

Hardware level RAID is expensive. v/s LVM comes with linux as default disk manager.

RAID1(Mirring) RAID5 (redundancy with parity)

RAID is used for Redundancy because Redundance provides the fault Tolarance and diffrent RAID levels doing this accouding to the need i.e better tolarance policy, make read fast make write fast etc.

LVM is basically similar to RAID but without redundancey and reliability. IT only provides you extara space if required by adding more disk.

Mostly   Server Administrator  Use RAID 5  some  company   those  who  have   good budget   they also use   RAID 10 

First you must read  this topic  RAID  0,1,5,10 difference .

than  configure  at your  environment .  RAID 5  is   Fault  Tolerance & Redundacny minimum   3 hard drive need to build  RAID   5 .   

Its more  better   you read  the below artical .

http://www.thegeekstuff.com/2010/08/raid-levels-tutorial

Thanks