DOCSLIB.ORG

Hitachi Virtual Storage Platform Provisioning Guide for Open Systems

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Hitachi Virtual Storage Platform Provisioning Guide for Open Systems Hitachi Virtual Storage Platform Provisioning Guide for Open Systems FASTFIND LINKS Document Organization Product Version Getting Help Contents MK-90RD7022-14 © 2010-2014 Hitachi, Ltd. All rights reserved. Legal Disclaimer No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or stored in a database or retrieval system for any purpose without the express written permission of Hitachi, Ltd. (hereinafter referred to as "Hitachi") and Hitachi Data Systems Corporation (hereinafter referred to as "Hitachi Data Systems"). Hitachi, Ltd., reserves the right to make changes to this document at any time without notice and assumes no responsibility for its use. This document contains the most current information available at the time of publication. When new or revised information becomes available, this entire document will be updated and distributed to all registered users. Some of the features described in this document might not be currently available. Refer to the most recent product announcement for information about feature and product availability, or contact Hitachi Data Systems Corporation at https://portal.hds.com. Notice: Hitachi, Ltd., products and services can be ordered only under the terms and conditions of the applicable Hitachi Data Systems Corporation agreements. The use of Hitachi, Ltd., products is governed by the terms of your agreements with Hitachi Data Systems Corporation. Notice on Export Controls: The technical data and technology inherent in this Document may be subject to U.S. export control laws, including the U.S. Export Administration Act and its associated regulations, and may be subject to export or import regulations in other countries. Reader agrees to comply strictly with all such regulations and acknowledges that Reader has the responsibility to obtain licenses to export, re-export, or import the Document and any Compliant Products. Hitachi is a registered trademark of Hitachi, Ltd., in the United States and other countries. Hitachi Data Systems is a registered trademark and service mark of Hitachi, Ltd., in the United States and other countries. Archivas, Essential NAS Platform, HiCommand, Hi-Track, ShadowImage, Tagmaserve, Tagmasoft, Tagmasolve, Tagmastore, TrueCopy, Universal Star Network, and Universal Storage Platform are registered trademarks of Hitachi Data Systems Corporation. AIX, AS/400, DB2, Domino, DS6000, DS8000, Enterprise Storage Server, ESCON, FICON, FlashCopy, IBM, Lotus, MVS, OS/390, RS/6000, S/390, System z9, System z10, Tivoli, VM/ESA, z/OS, z9, z10, zSeries, z/ VM, and z/VSE are registered trademarks or trademarks of International Business Machines Corporation. All other trademarks, service marks, and company names in this document or website are properties of their respective owners. Microsoft product screen shots are reprinted with permission from Microsoft Corporation. ii Hitachi Virtual Storage Platform Provisioning Guide for Open Systems Contents Preface . xvii Intended audience. xviii Product version . xviii Document revision level . xviii Changes made in this revision . .xix Referenced documents. .xix Document organization . xx Document conventions. xx Convention for storage capacity values . .xxi Accessing product documentation . xxii Getting help . xxii Comments . xxii 1 Introduction to provisioning . 1-1 About provisioning. 1-3 Basic provisioning . 1-3 Fixed-sized provisioning . 1-3 Disadvantages . 1-5 When to use fixed-sized provisioning. 1-5 Custom-sized provisioning . 1-5 Expanded LU provisioning . 1-6 When to use custom-sized provisioning . 1-7 When to use expanded-LU provisioning . 1-7 Basic provisioning workflow . 1-7 Dynamic Provisioning Overview. 1-8 Dynamic Provisioning. 1-8 Dynamic Provisioning concepts . 1-8 When to use Dynamic Provisioning . 1-9 Dynamic Provisioning advantages . 1-10 Dynamic Provisioning advantage example . 1-10 Dynamic Provisioning work flow . 1-11 Dynamic Tiering . 1-11 Contents iii Hitachi Virtual Storage Platform Provisioning Guide for Open Systems Tiers concept . 1-12 When to use Dynamic Tiering. 1-13 Data retention strategies . 1-13 Resource groups strategies . 1-13 Complimentary strategies. 1-14 Key terms. 1-14 Before you begin. 1-15 About cache management devices . 1-16 Calculating the number of cache management devices required by a DP-VOL . 1-16 Maximum capacity of cache management device . 1-17 Calculating the number of cache management devices required by a volume that is not a DP-VOL. 1-17 Viewing the number of cache management devices . 1-17 2 Configuring resource groups . 2-1 System configuration using resource groups . 2-3 Resource groups examples. 2-3 Example of resource groups sharing a port . 2-3 Example of resource groups not sharing ports . 2-5 Meta_resource . 2-7 Resource lock . 2-7 User groups . 2-7 Resource group assignments . 2-7 Resource group license requirements . 2-8 Resource group rules, restrictions, and guidelines . 2-8 Creating a resource group . 2-9 Adding resources to a resource group . 2-10 Removing resources from a resource group . 2-11 Managing Resource Groups . 2-11 Changing the name of a resource group . 2-11 Deleting a resource group . 2-12 Using Resource Partition Manager and other VSP products . 2-12 Copy-on-Write Snapshot . 2-13 Dynamic Provisioning. 2-13 Encryption License Key . 2-14 High Availability Manager . 2-14 LUN Expansion . 2-15 LUN Manager . 2-15 Performance Monitor . 2-16 ShadowImage. 2-17 Thin Image. 2-17 TrueCopy . 2-17 Universal Replicator . 2-18 Universal Volume Manager . 2-19 Open Volume Management . 2-21 iv Contents Hitachi Virtual Storage Platform Provisioning Guide for Open Systems Virtual Partition Manager . 2-22 Volume Migration. 2-22 Volume Shredder . 2-22 Configuration File Loader . ..
Load more

Recommended publications
  • Networker Jukebox Control Command Nsrjb
    Maintenance Procedures NSRJB ( 8 ) NAME nsrjb − NetWorker jukebox control command SYNOPSIS nsrjb [ −C ][−j name ][−s server ][−v ][−f device ][−S slots | −T Ta gs | volume names ] nsrjb −L [ −j name ][−s server ][−gimnqvG ][−Y | −N ][−R | −B ][−b pool ][−f device | −J hostname ][−e forev er ][−c capacity ][−o mode ][−S slots | −T tags | volume names ] nsrjb −l [ −j name ][−s server ][−nvqrG ][−R [ −b pool ]][−f device | −J hostname ][−S slot | −T tags | volume names ] nsrjb −u [ −j name ][−s server ][−qv ][−f device ][−S slot | −T tags | volume names ] nsrjb −I [ −j name ][−s server ][−Evpq ][−I | −f device ][−S slots | −T tags | volume_names ] nsrjb −p [ −j name ][−s server ][−vq ][−f device ][−S slot | −T tag | volume name ] nsrjb −o mode [ −j name ][−s server ][−Y ][−S slots | −T tags | volume names ] nsrjb −H [ −j name ][−s server ][−EHvp ] nsrjb −h [ −j name ][−s server ][−v ] nsrjb −U uses [ −j name ][−s server ][−S slots | −T tags ] nsrjb −V [ −j name ][−s server ] nsrjb −d [ −j name ][−s server ][−v ][−N ][−Y ][−P ports ][−S slots ][−T tags ][volume names ] nsrjb −w [ −j name ][−s server ][−v ][−N ][−Y ][−P ports ][−S slots | −T tags | volume names ] nsrjb −a [ −j name ][−s server ][−vd ][−T tags |[−T tags ] volume names ] nsrjb −x [ −j name ][−s server ][−vwX ][−T tags | −S slots ] nsrjb −F [ −j name ][−s server ][−v ] −f device DESCRIPTION The nsrjb program manages resources in two broad classes of jukeboxes, remotely managed jukeboxes and locally managed jukeboxes. Remotely managed jukeboxes are controlled through an external agent.
    [Show full text]
  • Silicon Graphics, Inc. Scalable Filesystems XFS & CXFS
    Silicon Graphics, Inc. Scalable Filesystems XFS & CXFS Presented by: Yingping Lu January 31, 2007 Outline • XFS Overview •XFS Architecture • XFS Fundamental Data Structure – Extent list –B+Tree – Inode • XFS Filesystem On-Disk Layout • XFS Directory Structure • CXFS: shared file system ||January 31, 2007 Page 2 XFS: A World-Class File System –Scalable • Full 64 bit support • Dynamic allocation of metadata space • Scalable structures and algorithms –Fast • Fast metadata speeds • High bandwidths • High transaction rates –Reliable • Field proven • Log/Journal ||January 31, 2007 Page 3 Scalable –Full 64 bit support • Large Filesystem – 18,446,744,073,709,551,615 = 264-1 = 18 million TB (exabytes) • Large Files – 9,223,372,036,854,775,807 = 263-1 = 9 million TB (exabytes) – Dynamic allocation of metadata space • Inode size configurable, inode space allocated dynamically • Unlimited number of files (constrained by storage space) – Scalable structures and algorithms (B-Trees) • Performance is not an issue with large numbers of files and directories ||January 31, 2007 Page 4 Fast –Fast metadata speeds • B-Trees everywhere (Nearly all lists of metadata information) – Directory contents – Metadata free lists – Extent lists within file – High bandwidths (Storage: RM6700) • 7.32 GB/s on one filesystem (32p Origin2000, 897 FC disks) • >4 GB/s in one file (same Origin, 704 FC disks) • Large extents (4 KB to 4 GB) • Request parallelism (multiple AGs) • Delayed allocation, Read ahead/Write behind – High transaction rates: 92,423 IOPS (Storage: TP9700)
    [Show full text]
  • Oracle® Linux 7 Managing File Systems
    Oracle® Linux 7 Managing File Systems F32760-07 August 2021 Oracle Legal Notices Copyright © 2020, 2021, Oracle and/or its affiliates. This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license, transmit, distribute, exhibit, perform, publish, or display any part, in any form, or by any means. Reverse engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is prohibited. The information contained herein is subject to change without notice and is not warranted to be error-free. If you find any errors, please report them to us in writing. If this is software or related documentation that is delivered to the U.S. Government or anyone licensing it on behalf of the U.S. Government, then the following notice is applicable: U.S. GOVERNMENT END USERS: Oracle programs (including any operating system, integrated software, any programs embedded, installed or activated on delivered hardware, and modifications of such programs) and Oracle computer documentation or other Oracle data delivered to or accessed by U.S. Government end users are "commercial computer software" or "commercial computer software documentation" pursuant to the applicable Federal Acquisition Regulation and agency-specific supplemental regulations. As such, the use, reproduction, duplication, release, display, disclosure, modification, preparation of derivative works, and/or adaptation of i) Oracle programs (including any operating system, integrated software, any programs embedded, installed or activated on delivered hardware, and modifications of such programs), ii) Oracle computer documentation and/or iii) other Oracle data, is subject to the rights and limitations specified in the license contained in the applicable contract.
    [Show full text]
  • Command Control Interface Command Reference
    Command Control Interface Command Reference Hitachi Virtual Storage Platform G1000 Hitachi Unified Storage VM Hitachi Virtual Storage Platform Hitachi Universal Storage Platform V/VM FASTFIND LINKS Contents Product Version Getting Help MK-90RD7009-19 © 2010-2014 Hitachi, Ltd. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or stored in a database or retrieval system for any purpose without the express written permission of Hitachi, Ltd. Hitachi, Ltd., reserves the right to make changes to this document at any time without notice and assumes no responsibility for its use. This document contains the most current information available at the time of publication. When new or revised information becomes available, this entire document will be updated and distributed to all registered users. Some of the features described in this document might not be currently available. Refer to the most recent product announcement for information about feature and product availability, or contact Hitachi Data Systems Corporation at https://portal.hds.com. Notice: Hitachi, Ltd., products and services can be ordered only under the terms and conditions of the applicable Hitachi Data Systems Corporation agreements. The use of Hitachi, Ltd., products is governed by the terms of your agreements with Hitachi Data Systems Corporation. Notice on Export Controls. The technical data and technology inherent in this Document may be subject to U.S. export control laws, including the U.S. Export Administration Act and its associated regulations, and may be subject to export or import regulations in other countries.
    [Show full text]
  • U.S. EPA, Pesticide Product Label, COMMAND 4E HERBICIDE, 09/02
    Don carlson, Ph.D. FMC corporation Agricultural Chemical Group 1735 Market street Philadelphia, PA 1910 3 Dear Dr. Carlson: Subject: Camand 4 EC Herbi,lde EPA Reg. No. 279-30~1 RE: Amended Labeling (tillage/nQ-tillage directions) Your Submission Dated August 13, 1992 ~he labeling refprred to above, submitted in connection with registration under the Federal Insecticide, Fungicide, and Rodenticide Act, as amended, is acceptable. A stamped copy is enclosed for your records. Sincerely yours, Robert J. Taylor Product I'anager (25) Fungicide-Herbicide Branch Registration Division (H7505C) CONCURRENCES SYMBOL;: l/7.)~.$P" ............... ... .................. ................. ................. ................................................... ::N£AM~, '%f:1; .... ........................................................................................................................ OFFICIAL FILE COPY _ i2 a a all a an a. .a $A 4SQS4 4t P ) ) Code 1139 Net Contents Command®4 E Herbicide For Agricultural or Commercial Use Only NOT FOR SALE OR USE IN CAUFORNIA EPA Reg. No. 279-3071 EPA Est. 279- Active Ingredient: By Wt. Clomazone: 2-(2-Chlorophenyl)methyl-4. 4-dimethyl-3-isoxazolidinone •...........••••..... 44.4% Inert Ingredients: .........•..............•......... 55.6% 100.0% Contains 4 pounds 01 active ingredient per gallon U.S. Patent No. 4.405,357 KEEP OUT OF REACH OF CHILDREN CAUTION FIRST AID " In SyH: Flush with plenty 0/ water. Get medical attention as AtlL.C OF CONTENTS 'Ossible. ' aI inlormations an pages 1-4 belore referring 10 specific ; swallowed: Drink prompUy large quatltities 01 crop use. alcohol. Do nol ind~'C8 vomiting. cau a physician, " Inh8led: Remove to fresh air. " Page lion. prelerably mouth·to-mouth.·. possible. ~~.::::::::::::::::::::::::::::::::::::::::::::: 1 Precautionary Statements ............................ ... 1 " on akin: Wash Skin Diredions lor Use ....................................... 1 allention. ~ and ~ ...............•.......•.......•... 2 For Emergency f!prayer CIeanuo ......................................
    [Show full text]
  • Weed Control Guide for Ohio, Indiana and Illinois
    Pub# WS16 / Bulletin 789 / IL15 OHIO STATE UNIVERSITY EXTENSION Tables Table 1. Weed Response to “Burndown” Herbicides .............................................................................................19 Table 2. Application Intervals for Early Preplant Herbicides ............................................................................... 20 Table 3. Weed Response to Preplant/Preemergence Herbicides in Corn—Grasses ....................................30 WEED Table 4. Weed Response to Preplant/Preemergence Herbicides in Corn—Broadleaf Weeds ....................31 Table 5. Weed Response to Postemergence Herbicides in Corn—Grasses ...................................................32 Table 6. Weed Response to Postemergence Herbicides in Corn—Broadleaf Weeds ..................................33 2015 CONTROL Table 7. Grazing and Forage (Silage, Hay, etc.) Intervals for Herbicide-Treated Corn ................................. 66 OHIO, INDIANA Table 8. Rainfast Intervals, Spray Additives, and Maximum Crop Size for Postemergence Corn Herbicides .........................................................................................................................................................68 AND ILLINOIS Table 9. Herbicides Labeled for Use on Field Corn, Seed Corn, Popcorn, and Sweet Corn ..................... 69 GUIDE Table 10. Herbicide and Soil Insecticide Use Precautions ......................................................................................71 Table 11. Weed Response to Herbicides in Popcorn and Sweet Corn—Grasses
    [Show full text]
  • Cheatsheet V2.4.Pdf
    ! ! 2.4!Edition! Cross!reference!processes!with!various!lists:! Scan!a!block!of!code!in!process!or!kernel!memory! psxview! for!imported!APIs:! ! impscan!! Show!processes!in!parent/child!tree:! !!!!Hp/HHpid=PID!!!!!!!!!Process!ID!! pstree! !!!!Hb/HHbase=BASE!!!Base!address!to!scan! & !!!!Hs/HHsize=SIZE!!!!!!!Size!to!scan!from!start!of!base! Process&Information& ! ! Logs&/&Histories& Specify!–o/HHoffset=OFFSET!or!Hp/HHpid=1,2,3!! ! ! Recover!event!logs!(XP/2003):! Display!DLLs:! evtlogs!! ! ! dlllist! !!!!HS/HHsaveHevt!!!!!!!!!!!!!!!!!!!!Save!raw!event!logs! Development!build!and!wiki:! ! !!!!HD/HHdumpHdir=PATH!!!Write!to!this!directory! github.com/volatilityfoundation!! Show!command!line!arguments:! ! ! cmdline! Recover!command!history:! Download!a!stable!release:! ! cmdscan!and!consoles!! volatilityfoundation.org!! Display!details!on!VAD!allocations:! ! ! vadinfo![HHaddr]! Recover!IE!cache/Internet!history:! Read!the!book:! ! iehistory!! artofmemoryforensics.com! Dump!allocations!to!individual!files:! ! ! vaddump!HHdumpHdir=PATH![HHbase]! Show!running!services:! Development!Team!Blog:! ! svcscan!! http://volatilityHlabs.blogspot.com!! Dump!all!valid!pages!to!a!single!file:! !!!!Hv/HHverbose!!!!Show!ServiceDll!from!registry! ! memdump!HHdumpHdir=PATH! ! (Official)!Training!Contact:! ! Networking&Information& Display!open!handles:! [email protected]!! ! handles!! ! Active!info!(XP/2003):! !!!!Ht/HHobjectHtype=TYPE!!!Mutant,!File,!Key,!etc…! Follow:!@volatility! connections!and!sockets!! !!!!Hs/HHsilent!!!!!!!!!!!!!!!!!!!!!!!!!!!Hide!unnamed!handles!
    [Show full text]
  • [D:]Path[...] Data Files
    Command Syntax Comments APPEND APPEND ; Displays or sets the search path for APPEND [d:]path[;][d:]path[...] data files. DOS will search the specified APPEND [/X:on|off][/path:on|off] [/E] path(s) if the file is not found in the current path. ASSIGN ASSIGN x=y [...] /sta Redirects disk drive requests to a different drive. ATTRIB ATTRIB [d:][path]filename [/S] Sets or displays the read-only, archive, ATTRIB [+R|-R] [+A|-A] [+S|-S] [+H|-H] [d:][path]filename [/S] system, and hidden attributes of a file or directory. BACKUP BACKUP d:[path][filename] d:[/S][/M][/A][/F:(size)] [/P][/D:date] [/T:time] Makes a backup copy of one or more [/L:[path]filename] files. (In DOS Version 6, this program is stored on the DOS supplemental disk.) BREAK BREAK =on|off Used from the DOS prompt or in a batch file or in the CONFIG.SYS file to set (or display) whether or not DOS should check for a Ctrl + Break key combination. BUFFERS BUFFERS=(number),(read-ahead number) Used in the CONFIG.SYS file to set the number of disk buffers (number) that will be available for use during data input. Also used to set a value for the number of sectors to be read in advance (read-ahead) during data input operations. CALL CALL [d:][path]batchfilename [options] Calls another batch file and then returns to current batch file to continue. CHCP CHCP (codepage) Displays the current code page or changes the code page that DOS will use. CHDIR CHDIR (CD) [d:]path Displays working (current) directory CHDIR (CD)[..] and/or changes to a different directory.
    [Show full text]
  • Command Control Interface Command Reference Error Codes
    Command Control Interface 01-43-03-01 Command Reference This document describes and provides instructions for using the Command Control Interface (CCI) software to configure and perform operations on the Hitachi RAID storage systems. Hitachi Virtual Storage Platform G series and F series Hitachi Virtual Storage Platform Hitachi Unified Storage VM Hitachi Universal Platform V/VM MK-90RD7009-33 October 2017 © 2010, 2017 Hitachi, Ltd. All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or stored in a database or retrieval system for commercial purposes without the express written permission of Hitachi, Ltd., or Hitachi Vantara Corporation (collectively, “Hitachi”). Licensee may make copies of the Materials provided that any such copy is: (i) created as an essential step in utilization of the Software as licensed and is used in no other manner; or (ii) used for archival purposes. Licensee may not make any other copies of the Materials. "Materials" mean text, data, photographs, graphics, audio, video and documents. Hitachi reserves the right to make changes to this Material at any time without notice and assumes no responsibility for its use. The Materials contain the most current information available at the time of publication. Some of the features described in the Materials might not be currently available. Refer to the most recent product announcement for information about feature and product availability, or contact Hitachi Vantara Corporation at https://support.HitachiVantara.com/ en_us/contact-us.html. Notice: Hitachi products and services can be ordered only under the terms and conditions of the applicable Hitachi agreements.
    [Show full text]
  • LECTURE SCHEDULE 5 Operating System – Some Fundamental DOS
    LECTURE SCHEDULE 5 Operating System – Some Fundamental DOS Commands,Rules for naming files in DOS and Types of files Operating System Operating system is a set of software that controls and manages hardware and basic system operations for a computer. The operating system loads programs into the computer's memory, runs these programs, and manages peripherals like disks and printers. Example: Disk Operating System (DOS) Windows LINUX Mac UNIX Disk Operating System (DOS) • In the 1980s or early 1990s, the operating system that shipped with most PCs was a version of the Disk Operating System (DOS) created by Microsoft: MS-DOS. • MS-DOS is a disk-based, single-user, single-task and character based user interface (CUI) operating system. Goto MSDOS from Windows Operating System: Click Start Button Choose Program Choose Accessories Click Command Prompt as shown below: Or Click Start Button Choose Run Type cmd in the Open tab as shown below: Command Prompt will get displayed as shown: The DOS commands can be entered in the command prompt and executed. Some Examples of DOS commands DIR Command The dir command allows you to see the available files in the current and/or parent directories. Examples: 1. DIR Lists all files and directories in the directory that you are currently in. 2. dir /w If information on the date / time and other information on the files are not needed, then this command can be used to list just the files and directories going horizontally, taking as little as space needed. 3. dir /on List the files in alphabetical order by the names of the files.
    [Show full text]
  • Design and Implementation of the Spad Filesystem
    Charles University in Prague Faculty of Mathematics and Physics DOCTORAL THESIS Mikul´aˇsPatoˇcka Design and Implementation of the Spad Filesystem Department of Software Engineering Advisor: RNDr. Filip Zavoral, Ph.D. Abstract Title: Design and Implementation of the Spad Filesystem Author: Mgr. Mikul´aˇsPatoˇcka email: [email protected]ff.cuni.cz Department: Department of Software Engineering Faculty of Mathematics and Physics Charles University in Prague, Czech Republic Advisor: RNDr. Filip Zavoral, Ph.D. email: Filip.Zavoral@mff.cuni.cz Mailing address (advisor): Dept. of Software Engineering Charles University in Prague Malostransk´en´am. 25 118 00 Prague, Czech Republic WWW: http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/ Abstract: This thesis describes design and implementation of the Spad filesystem. I present my novel method for maintaining filesystem consistency — crash counts. I describe architecture of other filesystems and present my own de- sign decisions in directory management, file allocation information, free space management, block allocation strategy and filesystem checking algorithm. I experimentally evaluate performance of the filesystem. I evaluate performance of the same filesystem on two different operating systems, enabling the reader to make a conclusion on how much the performance of various tasks is affected by operating system and how much by physical layout of data on disk. Keywords: filesystem, operating system, crash counts, extendible hashing, SpadFS Acknowledgments I would like to thank my advisor Filip Zavoral for supporting my work and for reading and making comments on this thesis. I would also like to thank to colleague Leo Galamboˇsfor testing my filesystem on his search engine with 1TB RAID array, which led to fixing some bugs and improving performance.
    [Show full text]
  • Introduction: DOS (Disk Operating System) Is an Oldest Type of Operating System
    DOS (Disk Operating System) 1 Introduction: DOS (Disk Operating System) is an oldest type of Operating System. Disk Operating System is abbreviated as DOS. DOS is a CUI type of Operating System. In computer science, a generic term describing any operating system is system software which is loaded from disk devices when the system is started or rebooted. DOS is a single-tasking, single-user operating system with a command-line interface. DOS acts on commands. Because DOS is ready to perform when given proper command hence, it is also known as Command Prompt. Commands are certain words of English language or short form of English words. The meaning of these word or short form is already known to DOS. Since, DOS recognized these words and hence acts accordingly. These words and short forms of the English words are better known as commands. Internal Command:-Those commands which are already stored in the “Command.Com” file of DOS are known as internal commands. For example, CLS, VOL, TIME, DATE, COPY etc External Command:-Those commands which are not included in the command.com file of DOS rather included in other files of DOS are known as external commands. It is formatted according to programme. For example, TREE, FORMAT, MODE etc Some Internal Commands:- 1. CLS To clear the screen. \>cls 2. DIR To view the directory and files C:\>Dir 3. DATE To View and change the date C:\>Date Current date is: 01-01-2008 Enter new date (mm/dd/yy):21-03-2009 4. TIME To view and change the time.
    [Show full text]