Explanation:

Lets understand RAID (Redundant Array of Independent Disks) LEVELS:

RAID 0 is also called a “stripe set” or a “stripped volume”. This is because data is spitted (striped) between discs – without parity information for redundancy. In other words, RAID 0 does not provide data redundancy. Inter-leveling of data between the disks causes a significant acceleration of read and write operations – due to the paralleling of these operations on all the discs in the array.

RAID 1 (NESTED RAID) is also called a “mirroring” The basic idea of such a solution is the replication (mirroring) of two or more discs. It means that while using RAID 1, an exact copy (or mirror) is created on two or more discs.

RAID 0+1 means arrays implemented as RAID 1, whose elements are RAID 0 arrays. Such implementation has the benefits of RAID 0 speed and RAID 1 fault tolerance with easy recovery.

RAID 1+0 (RAID 10) array is implemented as RAID 0, whose elements are RAID 1. It combines the same advantages of RAID 0 (speed) and RAID 1 (Fault tolerance with easy recovery), but in different way. RAID 1+0 creates a large stripe of small mirrors. After failure of a disk, while it is being replaced, only the small fragment of a whole array is rebuilt.

Explanation:

To uninstall PHP

sudo apt-get remove –purge php*
sudo apt-get purge php*
sudo apt-get autoremove
sudo apt-get autoclean
sudo apt-get remove dbconfig-php
sudo apt-get dist-upgrade
Note: The output of the below command will provide you with information the installed package software, version, architecture and short description about the package. grep command is used to find the PHP package
sudo dpkg --get-selections | grep php | cut -f 1
sudo apt-get remove --purge <package name from the previous command output>
sudo whereis php
sudo rm -rf <directory/file path from the previous command output>

To uninstall Apache

sudo service apache2 stop
sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
sudo apt-get autoremove
The output of the below command will provide you with information the installed package software, version, architecture and short description about the package. grep command is used to find the MySQL package
sudo dpkg --get-selections | grep apache | cut -f 1
sudo apt-get remove --purge <package name from the previous command output>
sudo whereis apache
sudo rm -rf <directory/file path from the previous command output>

To uninstall MySQL

sudo apt-get remove –purge mysql*
sudo apt-get purge mysql*
sudo apt-get autoremove.
sudo apt-get autoclean.
sudo apt-get remove dbconfig-php.
sudo apt-get dist-upgrade.
The output of the below command will provide you with information the installed package software, version, architecture and short description about the package. grep command is used to find the MySQL package
sudo dpkg --get-selections | grep mysql | cut -f 1
sudo apt-get remove --purge <package name from the previous command output>
sudo whereis mysql
sudo rm -rf <directory/file path from the previous command output>

Explanation: