OVERVIEW OF VIRTUALIZATION
What is virtualization?
Virtualization: is
technology of run multiple same or different operating systems which is complete
isolated from each other.
Example runs both windows and Linux on the same machinelify data center management.
·
BTYPES OF VIRTUALIZATION
a.
Server virtualization
b.
Desktop virtualization
c.
Application virtualization
d.
Network virtualization
e.
Memory virtualization
f.
Data virtualization
g.
Storage virtualization
BENEFIT OF VIRTUALIZATION
·
Reduce capital and
operating costs.
·
Minimize or eliminate
downtime.
·
Increase IT
productivity, efficiency, agility and responsiveness.
·
Provision applications
and resources faster.
·
Enable business
continuity and disaster recovery.
·
Simplify data center
management.
What is DOS (Disk operating system)?
DOS was the first widely installed operating system of a personal computer
DOS control computer hardware and provide an environmental for program to run. The system program must always present when working with you computer.
DOS is a single user operating system. A single user operating system is most popular in microcomputer up mid in 1990s.
NOTE: It is also called DOS it is stored in disk of a computer.
Major Tasks of DOS is:-
I. To control input and output system.
II. To enable user to load and execute the program
III. To maintain orderly system of data on the disk.
DOS files
a. BAT(batch files)
b. COM(command files)
c. EXE(executable files)
DOS command consist three parts: File name, parameters, switches.
Types of DOS command
A. DOS Internal command: Are stored in the command.com file.
DOS internal command are load automatically in the memory (RAM) when you are start you system.
Some DOS Internal commands are:-
CLS – Used to clear the screen.
VER – Display the DOS version number
VOL – Display the volume label and serial.
TYPE – Display the content of a text
Exit – Exit the command processor
(COMMAND.COM program)
B. DOS External command: The command required less frequently. These are residing on disk. Load automatically in the memory (RAM) only when needed.
Some of DOS External commands are:-
CHKDSK – Check the validity of the disk and report the total space, number of the file and amount of free space.
COMP – Compare the content of the two set of the files.
COMMAND – Start the command processor.
SYS – Creates a bootable drive.
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