RECOVERY OF OPERATING SYSTEM USING CLOUD STORAGE

RECOVERY OF OPERATING SYSTEM USING

CLOUD STORAGE

Prerna Malik, Poonam Rawat

(IT-II)dronacharya college of engineering

Abstract:Cloud storage is a service model in which data is maintained, managed and backed up remotely and made available to users over a network.Cloud storage has several advantages over traditional data storage that are accessibility, availability, authenticity, firm safety for data retrieval fast data recovery, and lower economic cost factors as we do not need having to purchase, operate and maintain valuable hardware devices. We are able to retrieve our data from any location that has Internet access instead of carrying a physical storage device with us. This research paper proposes a data recovery process for an operating system of a computer in which, Instead of storing information to the computer's hard drive or other local storage device, we can save it to a cloud storage space which can be easily retrieved through an internet connection.

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The demand for reliable computer systems continues to increase. Every computer user wants the more reliable computer to us. The reliability of computer is more important in these days.Operating system failure causes various problems, including loss of temporary data on the main memory. As a result, files are broken or the data of applications are lost. The general method for restoring an OS facing failure is rebooting the computer. However, the computer is not available for users for tens of seconds during the rebooting process. In this paper, we resolve these problems by making the restoration process faster and protecting files caches from OS failure.

Cloud backup ("cloud computer backup") refers to backing up data to a remote, cloud-based server. Rather than storing the data locally on a physical disk, such as a hard drive or tape backup, cloud backup data is stored in and is accessible from multiple distributed and connected resources that comprise a cloud.A Cloud backup service is not a one-size-fits-all solution. Keeping track of cloud backup trends, white papers and research gives small

businesses knowledge and a solid foundation to get the most value from cloud services. Could stores offside database backup sending backups over the Internet. To be stored in the Cloud benefits from the elasticity in capacity and operational expenses typical of Cloud services. It can also simplify your own infrastructure as you no longer need to provide and manage storage. When most operating systems encounter some critical errorsinhardwareorsoftware applications,theyshutthemselvesdown and have to be rebooted, resulting in a loss of currently runninguserapplicationsanddata. This behavior is unacceptable because the user is only concerned with application or data, which might still be intact and recoverable. This failsto behaviortoallow forrecoveryofthesystem,atleastpartially,

inordertopreventlossofuserdata. In this paper we use the cloud to recovery of system

Our goal is to recover an operating system(OS) transparently to user applications after an internal failure. In this paper, we present a set of some recovery error management techniques that can be easily implemented to improve the reliability of an OS. In this paper we also discuss the about error control over error handling using language supported exception handling, code reloading, OS component isolation, component micro-reboots, automatic system service restarts and watchdog based recovery allow an OS to recover from a wide variety of errors. A process-level recovery procedure which recovers individual user process state can be used as a last resort when all other attempts at transparent recovery fail.

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restore is actually for restore.Details on the use of the restore command are provided in the UNIX System Administration Handbook.

In some cases, a simple restore will not suffice. The data storage media may have physical damage. There are only two major companies in the United States who specialize in recovery of data from physical storage media. DriveSavers (www.driversivers.com) specializes in salvaging data damaged by fire, floods or hard-disk crashes. This company also maintains a museum of bizarre disk disasters on their website which is worth reading. Ontrack Data International (www.ontrack.com) also offers a remote data recovery service for cases where the physical media is not destroyed.

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 Backup- to create a copy of data

 Archive-move data with low usages patterns to slower media for historical or other purpose

 Restore-copy a file or group of files for backup or primary storage location

 Recover-rebuilt a system or data center backup

4.

Preventing data loss is one of the most critical issues involved in managing database systems. Data can be lost as a result of many different problems:

 Hardware failures  Viruses

 Incorrect use of UPDATE and DELETE statements

 Software bugs

 Disasters, such as fire or flood

To prevent data loss, you can implement a recovery strategy for your databases.

4.1 Full Database Backups:-A very common backup

strategy is to back up the whole database in a predefined time series (once each night, for instance). With such a backup strategy, it is possible to recover a database to the state it had when the last backup occurred. This strategy is implemented by using full database backups. A full database backup contains all

data and database Meta information needed to restore the whole database, including full-text catalogs. When you restore a full database backup, it restores all database files yielding data in a consistent state from the time the backup completed.

4.2 Using Differential Backups:-The advantage of a full database backup is that it contains all the data needed to restore the entire database. But this advantage can also be a disadvantage. Consider a database where full database backups are performed each night. If we need to recover the database, you always have to use the backup from the previous night, resulting in the loss of a whole day’s work. One way to reduce the potential period of time that can be lost would be to perform full database backups more often. But this itself can be a problem. Because all data and parts of the transaction log are written to the backup device, it can be very time-intensive to make a backup. Also, you need a lot of storage space to hold these backups, and a full backup can decrease the performance of your database as a result of the large amount of I/O it requires.

4.4 LAN Based recovery:LAN-free backup is the process of backing up server data to a centralized storage device rather than moving it across a local-area network (LAN). Transmitting all such data over the LAN can slow down the network.LAN-free backup can be conducted through a storage area network (SAN) or with a tape device directly attached to the storage subsystem. Advantages of LAN-free backup include shorter backup and recovery times and less disruption to other systems and applications.

5.

system:-Cloud recovery is quickly becoming a very attractive data protection option for many IT corporate. Many have already made the move or are carefully considering moving data protection to a private, public, or hybrid cloud. A successful move to cloud backup requires ensuring data protection demand are met while overcoming or reduce the issues associated with traditional data protection process. This paper examines these problems and how cloud recover technology overcomes.

5.1 The Urgent Market Problems with Traditional Data Protection Technologies:-The most common form of data protection is restore a system. It is well known for failed recovery, difficult to management, check agent operation, upgrades, application interruption, failure to meet recover windows, difficult to impossible restores, inflexibility, and high total costs of ownership. These problems can be directly tied to its anachronistic architecture. IT starts with and admin or root privileged agent. The agent is installed on the operating system for backup.

Another agent is installed on each structured data application. A separate agent is typically installed for additional functionality such as archiving and CDP. Because of their admin/root privileges, each system must be rebooted upon agent installation or upgrade. This makes agents completely application disruptive forcing the data protection admin to schedule installs and upgrades for late nights, weekends, or holidays. That’s only part of the problems tied to these agents. 5.2 Server-to-Server via Proxy:-Other forms of data protection such as server-to-server replication and server-to-server replication via proxy have similar issues as traditional restore. Traditional server-to-server data protection is essentially mirroring between servers. It doesn’t protect against the rolling disaster, malware, human error, and data corruption. The newer server-to-server via proxy is functionally very similar to backup/restore with most of the same problems and recovery complexity. They have others as well including limited scalability

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deploy the technology. The main aim of this article is to provide an overview of the technology and to explore the snapshot capabilities in the most efficient way.

5.4 Private, Public, and Hybrid Cloud Recovery

Requirements:-1. Lower total cost of ownership 2. Smart use of IT resources

3. Reduced operating/administrative costs 4. Effective agent-less recovery.

5. Restore validation with autonomic data healing of “bad” data.

6. Improved reliability and speed of recovery 7. User enabled simple online one-pass restores. 8. Eliminates the shortcomings of tape backup. 9. Multi-tenancy.

10. Flexible backup and recovery RPO & RTO granularity options.

11. Private and public cloud integration.

5.4.1 Lower total cost of ownership:-A cloud backup, recovery and restore solution takes advantage of your existing infrastructure, so you don’t need to buy or install expensive equipment. Cloud backup software integrates with IT environments to locate and prioritize files for backup, and then securely transmits encrypted copies of those files to offsite data centers. This result in a lower total cost of ownership compared to the purchase and maintenance of complex tape backup systems. 5.4.2 Smart use of IT resources:-A cloud backup, recovery and restore solution allows your business to redirect IT resources to more pressing challenges or strategic initiatives within your organization. The built-in scalability of cloud backup makes it easy to evolve as your business data environment grows and changes.

5.4.3 Reduced operating/administrative costs:-Once you select a backup schedule, company data is saved automatically, providing an unobtrusive and transparent solution. This “set it and forget it” model results in less operational and administrative management for data backup.

5.4.4 Effective less recovery:-Effective agent-less recovery requires being able to provide the same or more data collection as agent-based recovery, but without agents. This includes both visible and hidden files. And effective agent-less backup/recovery cannot be application disruptive when implemented,

operated, managed, or upgraded meaning everything is done online.

5.4.5 Restore validation with autonomic data healing of “bad” data:-Provides the peace of mind that should there be a recovery event, that the data will be recovered. And it eliminates the massive headaches of actually having to run manual tests to see if the data is recoverable.

5.4.6 Improved reliability and speed of recovery:-Having a backup solution is meaningless without a rapid and reliable method of recovering and restoring data. A cloud backup and recovery system instantly restores data regardless of your location, including individual files, the most common type of data recovery. By working with a managed service provider, you can establish Recovery Time Objectives and Recovery Point Objectives that match your business requirements.

5.4.7 User enabled simple online one-pass restores:-No backup/restore admin would be required. It would also make restores relatively simple “point-and-click” affairs. If a Microsoft Windows Exchange server goes down, there would be no need to first restore the Exchange server and then spend hours, days, weeks restoring the individual mailboxes and messages. One pass restores would accomplish this all at the same time. 5.4.8 Eliminates the shortcomings of tape

backup:-Tape backups are often

expensive,vulnerable to obsolescence and can be lost or stolen when being transported off-site. Also, recovering data from a tape system can be slow process, especially if a tape needs to be retrieved from an off-site vault.

5.4.10 Flexible backup and recovery RPO & RTO granularity options:- Advanced data protection and recovery across physical and virtual storage heightens IT efficiency. Symantec™ Backup Exec™ 2012 software helps IT staff transition from managing backup tasks on individual devices to managing system wide strategies.

5.4.11 Private and public cloud integration:-There should be two levels of private public cloud integration. The first allows up the last backup to reside at each office on local storage. Both the latest and all other incremental backups continue to reside in the centralized backup/recovery vault. The second allows for the organization to provide complete cloud backup/restore, and allow them to replicate their vault to a public cloud backup supplier for offsite backup/restore and archive.

6. Conclusion: