A virtual machine can exist as a standalone machine or it can exist within a vApp.
A virtual machine is a software computer that, like a physical computer, runs an operating system and applications. The virtual machine consists of a set of specification and configuration files and is backed by the physical resources of a host. Every virtual machine has virtual devices that provide the same functionality as physical hardware are more portable, more secure, and easier to manage. Virtual machines can be standalone, or they can exist within a vApp. A vApp is compound object composed of one or more virtual machines as well as one or more networks.
The following figure shows the different options when creating a virtual machine. You can create a standalone virtual machine. In this case, the virtual machine is directly connected the organization VDC. Or, you can create a virtual machine within a vApp. Ceating a virtual machine inside of a vApp allows you to group together multiple virtual machines and their associated networks. vApps allow you to build complex applications, and save them for future use in a catalog.Virtual Machines are Standalone or within a vApp
What do you mean by operating system? Definition : An operating system is a program that act as an interface between the user of a computer and the Computer hardware. Operating system is a first program that gets loaded into the memory through a process called booting. Concepts of operating system : · The purpose of operating system is to provide an environment in which a user can execute program in a convenient and efficient manner. · Operating system is an integrated set of program that manages the various hardware resources such as processor, memory, I/O Devices , communication devices and overall operation of a computer system. · Operating systems also acts as a platform on which various applications programs such as word processor and excel are executed. · The most common operating system are the window family of operating system (windows 98, window
Direct Communication · Direct communication establishes a link between two processes. A communication link is a unidirectional path along which information flows. · two processes use single communication link to share information. · In this metod, there cannot be more that one link between two processes direct communication · Send and receive function used in direct communication are given below : · Send(process name , message ,(receive(process name , message) Send(A, message )- send a message to process A Receive(A, message )-receive a message from process B Indirect communication · In indirect communication , no direct communication link exists between two processes. · In this , messages are sent to and received from mailbox. · A mailbox is a specialized repository where message can be placed by processes and from
Multitasking system · Technically , multitasking is same as multi programming · In a multitasking operating system, s single user can execute multiple programs at the same time · We can also say, multitasking is the system capability to work on more than one job or process at the same time. · It means that whenever a job needs to perform I/O operation, the cpu can be used for execting some other job diagram of multi tasking · There are two type of multitasking : 1. Cooperative multitaskin g 2. Preemptive multitasking · Co operative multitasking in cooperative multitasking , program can aquire the cpu for the required amount of time a program canshare CPU with any other program that is executing simultaneously, if it does not currently require the CPU. · Preemptive multitasking . In preemptive multitasking the operating system allocat
ENTERPROCESS COMMUNICATION AND SYNCHRONIZATION · In multi programming environment multiple process co-exit . a single program may be broken into number of processes. · The process are classified into two categories : independent processes and cooperating processes. · An independent process is a standalone process that does not share any data with any other process. It cannot affect or be affected by the other processes executing in the system. In other words, the modification made to an independent process does not affect the functioning of other process. · A cooperating processes is a process that shares data with other processes in a system it can affect or be affectedly the other processes executing in the system · Cooperating processes can communicate in a shred memory environment . · The various reasons for using cooperating processes are: 1. Information sharing : when several users want to acce
What do you mean by operating architecture? SYSTEM CALLS · System calls provide the interface between a process and the operating system. · The purpose of system call is to request the operating system to perform some activity. The execution of a system call require the user process to save its current state and pass the control of the CPU to the operating system to perform some function. There are different system calls for performing different kinds of tasks: 1. FILE MANIPULATION SYSTEM CALLS , for example: open, close, read, write, reposition etc. 2. PROCESS CONTROL SYSTEM CALLS . For example : end, abort, load, execute, create process, terminate process, allocate and free memory, wait event, signal event. 3. DEVICE MANAGEMENT SYSTEM CALLS . for example: read write, reposition, request device, release device attributes, set device attributes etc. 4.
Comments
Post a Comment