Storage management in operating system
- 1. T.DEEPIKA M.SC(INFO-TECH) NADAR SARASWATHI COLLEGE OF ARTS AND SCIENCE
- 2. storage management in operating system Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between mainmemoryanddiskduringexecution. Memory management keeps track of each and every memory location, regardless of either it is allocated to some process or it is free.
- 3. File Management System A file management system is a type of software that manages data files in a computer system. It has limited capabilities and is designed to manage individual or group files, such as special office documents and records. It may display report details, like owner, creation date, state of completion and similar features useful in an office environment. file management system is also known as a file manager.
- 4. FILE MANAGEMENT IN OS: File management is one of the basic and important features of operating system. Operating system is used to manage files of computer system. All the files with different extensions are managed by operating system. Introduction to Operating System and their Types. A file is collection of specific information stored in the memory of computer system.
- 5. File management is defined as the process of manipulating files in computer system, it management includes the process of creating, modifying and deleting the files. The tasks performed by file management of operating system of any computer system:
- 6. It helps to create new files in computer system and placing them at the specific locations. It helps in easily and quickly locating these files in computer system. It makes the process of sharing of the files among different users very easy and user friendly.
- 7. It helps to stores the files in separate folders known as directories. These directories help users to search file quickly or to manage the files according to their types or uses. It helps the user to modify the data of files or to modify the name of the file in the directories
- 8. The file management of function in operating system File Attributes It specifies the characteristics of the files such as type, date of last modification, size, location on disk etc. file attributes help the user to understand the value and location of files. File attributes is one most important feature. It is uses to describe all the information regarding particular file. File Operations It specifies the task that can be performed on a file such as opening and closing of file.
- 9. File Access permission It specifies the access permissions related to a file such as read and write. File Systems It specifies the logical method of file storage in a computer system. Some of the commonly used files systems include FAT and NTFS.
- 10. MEMORY MANAGEMENT IN OS: Memory management is the functionality of an operating system which handles or manages primary memory and moves processes back and forth between main memory and disk during execution. Memory management keeps track of each and every memory location, regardless of either it is allocated to some process or it is free. It checks how much memory is to be allocated to processes. It decides which process will get memory at what time. It tracks whenever some memory gets freed or unallocated and correspondingly it updates the status.
- 11. THREE TYPES OF ADDRESSES USED IN MEMORY Symbolic addresses The addresses used in a source code. The variable names, constants, and instruction labels are the basic elements of the symbolic address space. 2Relative addresses At the time of compilation, a compiler converts symbolic addresses into relative addresses. 3Physical addresses The loader generates these addresses at the time when a program is loaded into main memory.
- 12. Memory Allocation Main memory usually has two partitions − Low Memory − Operating system resides in this memory. High Memory − User processes are held in high memory.
- 13. CACHING Caching (pronounced “cashing”) is the process of storing data in a cache. A cache is a temporary storage area. For example, the files you automatically request by looking at a Web page are stored on your hard disk in a cache subdirectory under the directory for your browser. When you return to a page you've recently looked at, the browser can get those files from the cache rather than the original server, saving you time and saving the network the burden of additional traffic.
- 14. I/O(INPUT/OUTPUT)OPERATING SYSTEM The three major jobs of a computer are Input, Output, and Processing. In a lot of cases, the most important job is Input / Output, and the processing is simply incidental. For example, when you browse a web page or edit any file, our immediate attention is to read or enter some information, not for computing an answer. The primary role of the operating system in computer Input / Output is to manage and organize I/O operations and all I/O devices. In this chapter, you will learn about the various uses of input output devices concerning the operating system.
- 15. OVERVIEW OF INPUT OUTPUT The controlling of various devices that are connected to the computer is a key concern of operating-system designers. This is because I/O devices vary so widely in their functionality and speed (for example a mouse, a hard disk and a CD-ROM), varied methods are required for controlling them. These methods form the I/O sub-system of the kernel of OS that separates the rest of the kernel from the complications of managing I/O devices.
- 16. I/O HARDWARE Computers operate many huge kinds of devices. The general categories of storage devices are like disks, tapes, transmission devices (like network interface cards, modems) and human interface devices (like screen, keyboard, etc.). A device communicates with the operating system of a computer by transferring signals over cable or even through the air. The peripheral devices communicate with the machine through a connection point also called ports— (one example is a serial port). When devices use a set of wires or cables, that connecting cables are called a "bus." A bus is a collection of wires and a firmly defined protocol which specifies a set of messages that can be sent on the wires.
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