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《Pro Data Backup and Recovery_Steven Nelson》介绍
Introduction to Backup andWho Should Read this Book?Pro Data Backup and Recovery has come from the many views of people that T have interacted withdung mycareer as a systems admin it l or systems engineer.and consul ant.This books prar iyFeared toward the systems enine ers and arch teets win an organiza on.but it wi lao be us fl fori he day today func tons of systems admins tal or sandie managers of both teams.Systemthat they are responsible for providing on their systems， as well as helping to fashion systems andalso use the inform nation in this book to influence users of their systems to protect their data.create datastructures that are cas y to backup， and identify data that is most cric alto be backed up and how itshould be protected.Line managers will find this book useful for understanding some of the technical trade-offs in dataprotect n， heping them make betrdeciionsrcgadinghe recommend at ins that their sytemsengineers are making and system administrators are implementing for backup and recovery.The bookmanager help to ask the hard questions and be able to answer them when their team asks them. backups yi ems have severi cha actes is.o.m.aoPro Data Backup and Recovery is primarily for systems eng neers and architects(and administratorsin many cases l who are respon ible for the des in implement in， and op eai on of backup andrecovery systems.Backup is the one of those“invisible jobs in systems-if people know who you are itsome ties thankless to le to design， modify.and optimize your backup systems； to make those timeswhere you are visible as short as possible， and to give you the tools to help make the recoveriesThey are not inexpensive over the lifecycle of the backup solutionLarge am no unts of resources can be consumed in terms of：People timeOperational and e apital expenses
CHAPTER 1INTRODUCTONTOBACKLP AND RECOVERYyour organization.Although these configurations can be applied to many different brands of backupsoftware， this book focuses only on the two major backup vendors：Symantec NetBackup andmau tsmpahactieaoedaseepighe a miaa proaches dpriligBrdkupsbutfrdit le rente ustomer organizational size.u espen c command and a.oayopaoltnctosthat are executed dire et ly by system adr ins trators.I make some assumptions about the familar y of.b.i.o.onsThis book is more concerned with the“why of using various components as well as the“how ofcommands used will already be familiar to the reader.Backup and Recovery Conceptsto many people.Backups and archives tend to be used interchangeably， representing some type of dataNote Where the di frence between backups and archives get spa ric ularly confusing is when backups arestored for long periods of time， on the order of years.Such backups can be mistakenly referred to as archivesbecause the data the backup contains might indeed be the only copy of the data in existence at any particularpoint in time.This is part c ularly common in organizations that contain both open systems(UNIX/Linux andWindows) and mainframe environments because of terminology differences between the two platforms.BackupsBackups are snapshot copies of data taken at a particular point in time， stored in a globally commonmaintained independently of the first.Multiple levels of backups can be created.Full backups represente omp ece snapshot o the data that is intend ddobeproteeceaFalBidkups pro vdc the base iRe ipall other levels of backupoccurred since the last full backup.This type of backup is typically used in environments that do notdata to backup.Each day5percentorlTB of data changes in the environment.Assuming that this is atad tional backup envi onment fa die rental backup methodology s used.the ist day IT B of data isbacked up(the first day's change rate against the previous full backup l.The second day， 2TBis backedimages required to perform the restore.A differential restore requires only the full backup plus the latestThe different il backup f see Figure 1-l) must be used with care because it can grow quickly t