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Backup and Recovery

Module 3.2

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Backup/Recovery 

pon co!pletion o" this !odule# you $ill %e a%le to& 'escri%e Backup(Recovery considerations

'escri%e Backup(Recovery operations

'escri%e Backup topologies

'escri%e %ackup technologies

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Lesson: Backup/Recovery Overview 

pon co!pletion o" this lesson# you %e a%le to& 'e"ine Backup and %ackup consideration

'escri%e purposes o" %ackup

E*plain %ackup granularity and restore

+ist %ackup !ethods

'escri%e %ackup(recovery process and operation

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What is a Backup? 

Backup is an additional copy o" data that can %e used "orrestore and recovery purposes

he Backup copy is used $hen the pri!ary copy is lost or

corrupted

his Backup copy can %e created %y&

 – i!ply coping data /there can %e one or !ore copies

 – Mirroring data /the copy is al$ays updated $ith $hatever is $ritten to

the pri!ary copy

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It’s All About Recovery 

Businesses %ack up their data to ena%le its recovery incase o" potential loss

Businesses also %ack up their data to co!ply $ith

regulatory reuire!ents

Backup purposes&

 – 'isaster Recovery

Restores production data to an operational state a"ter disaster 

 – 3perational

Restore data in the event o" data loss or logical corruptions that !ay

occur during routine processing

 –  Archival

4reserve transaction records# e!ail# and other %usiness $ork products

"or regulatory co!pliance

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Backup/Recovery Consierations

Custo!er %usiness needs deter!ine& – 6hat are the restore reuire!ents 7 R43 8 R3

 – 6here and $hen $ill the restores occur

 – 6hat are the !ost "reuent restore reuests

 – 

6hich data needs to %e %acked up – :o$ "reuently should data %e %acked up

hourly# daily# $eekly# !onthly

 – :o$ long $ill it take to %ackup

 – 

:o$ !any copies to create – :o$ long to retain %ackup copies

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Other Consierations: !ata

+ocation – :eterogeneous plat"or!

 – +ocal and re!ote

0 "iles o" >MB si=e ?s >0000 "iles o" >@B si=e

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Backup "ranularity 

Full Backup

Su Su Su Su Su

Incremental Backup

Su Su Su Su SuM T TW F S M T TW F S M T TW F S M T TW F S

Cumulative (Differential) Backup

Su Su Su Su SuM T TW F S M T TW F S M T TW F S M T TW F S

Amount of data backup

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Restorin# $ro% Incre%ental Backup

@ey eatures

 –  iles that have changed since the last %ackup are %acked up

 –  e$est a!ount o" "iles to %e %acked up# there"ore "aster %ackup and less

storage space

 –  +onger restore %ecause last "ull and all su%seuent incre!ental %ackups

!ust %e applied

ncre!ental

Tuesday

ile ,

ncre!ental

Wednesday

pdated ile )

ncre!ental

Thursday

ile 1 iles ># 2# )# ,# 1

4roduction

Friday

iles ># 2# )

Monday

ull Backup

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Restorin# $ro% Cu%ulative Backup

@ey eatures

 –  More "iles to %e %acked up# there"ore it takes !ore ti!e to %ackup

and uses !ore storage space

 –  Much "aster restore %ecause only the last "ull and the last cu!ulative

%ackup !ust %e applied

Cu!ulative

Tuesday

ile ,iles ># 2# )

Monday

ull Backup Cu!ulative

Wednesday

iles ,# 1

Cu!ulative

Thursday

iles ,# 1# 5 iles ># 2# )# ,# 1# 5

4roduction

Friday

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Backup &ethos

Cold or o""line :ot or online

3pen "ile

 – 

Retry – 3pen ile Agents

4oint in i!e /4 replica

Backup "ile !etadata "or consistency Bare !etal recovery

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Backup Architecture an 'rocess

Backup client

 –  ends %ackup data to

%ackup server or storage

node

Backup server 

 – Manages %ackup operationsand !aintains %ackup

catalog

torage node

 –  Responsi%le "or $riting data

to %ackup device

Backup erver(

torage

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Backup Operation

1

 Application erver and Backup Clients

Backup erver  torage

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Restore Operation

 Application erver and Backup Clients

1

$

#

"

"

Backup erver torage

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Lesson (u%%ary

@ey points covered in this lesson& 4urposes "or Backup

Considerations "or %ackup and recovery

Backup granularity – ull# Cu!ulative# ncre!ental

Backup !ethods

Backup(recovery process and operation

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Lesson: Backup/Recovery )opolo#ies * )echnolo#ies

pon co!pletion o" this lesson# you %e a%le to& 'escri%e %ackup topologies

 – 'irect %ackup

 – +A< and +A< "ree %ackup

 – Mi*ed %ackup

'etail %ackup in

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Backup )opolo#ies

here are ) %asic %ackup topologies&

 – 'irect Attached Based Backup

 – +A< Based Backup

 – A< Based Backup

 – 

Mi*ed %ackup

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!irect Attache Backups

Backup 'evice Application erver 

and Backup Client

and torage

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LA+ Base Backups

LAN

torage

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(A+ Base Backups ,LA+ -ree.

Data

Metadata

Backup 'eviceBackup erver   Application erver

and Backup Client

torage

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&ie Backup

Data

Metadata

Backup 'eviceBackup erver   Application erver 

and Backup Client

torage

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Backup in +A( 0nviron%ent 1 (erver Base 

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Backup in +A( 0nviron%ent 1 (erverless

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Backup in +A( 0nviron%ent 1 +!&' 23way 

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Backin# up a +A( !evice 1 +!&' 43way 

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Backup )echnolo#y options

Backup to ape

 – 4hysical tape li%rary

Backup to 'isk

Backup to virtual tape

 – ?irtual tape li%rary

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Backup to )ape

raditional destination "or %ackup

+o$ cost option

euential ( +inear Access

Multiple strea!ing – Backup strea!s "ro! !ultiple clients to a single %ackup device

Tape

'ata "ro!trea! > 'ata "ro!

trea! 2'ata "ro!trea! )

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'hysical )ape Library 

Drive&

Cartrid'e&

Import+

,-port

Mailbo-

.inear

/obotic&

S&tem

Front 0ie* Back 0ie*

I+ Mana'ement 2nit

Server Cla&& Main Controller

3o*er S&tem&

Drive&

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)ape Li%itations

Relia%ility

 – Restore per"or!ance

Mount# load to ready# re$ind# dis!ount ti!es

euential Access

Cannot %e accessed %y !ultiple hosts si!ultaneously

Controlled environ!ent "or tape storage

6ear and tear o" tape

hipping(handling challenges

ape !anage!ent challenges

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Backup to !isk 

Ease o" i!ple!entation

ast access

More Relia%le

Rando! Access

Multiple hosts access

Enhanced overall %ackup and recovery per"or!ance

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)ape versus !isk 1 Restore Co%parison

Typical Scenario: 00 users# ;1 MB !ail%o*

50 DB data%ase

Source: EM En!ineerin! and EM "T

otal ti!e "ro! point o" "ailure to return o" service to e-!ail users

0 >0 20 )0 ,0 10 50 ;0 0 90 >00 >20>>0

Recovery Ti#e in Minutes$

TapeBackup ( Restore

DiskBackup ( Restore

%&'Minutes

2(Minutes

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5irtual )ape Library 

Backup Server)

Stora!e *ode

Backup lients

E#ulation En!ine

   +   i  r   t  u  a   l   T  a  p  e   ,   i

   -  r  a  r  y   .  p  p   l   i  a  n  c  e

Stora!e /,0*s1

LAN

FC SAN

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)ape 5ersus !isk 5ersus 5irtual )ape

TapeDiskare

BackuptoDisk+irtual Tape

455site apa-ilities Fes

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Lesson (u%%ary

@ey points covered in this lesson&

Backup topologies

 – 'irect attached# +A< and A< %ased %ackup

 – Backup in

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&oule (u%%ary 

@ey points covered in this !odule&

Backup and Recovery considerations and process

Backup and Recovery operations

Co!!on Backup and Recovery topologies

Backup technologies

 – ape# disk# and virtual tape

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Concept in 'ractice 1 0&C +etWorker 

'ata ource

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  Check 6our 7nowle#e

6hat are three pri!ary purposes "or %ackup

6hat are the three topologies that support %ackup

operation

'escri%e three !aGor considerations o" %ackup(recovery.

6hat are the advantages and disadvantages in tape and

virtual tape %ackups

6hat are the three levels o" granularity "ound in

Backups

:o$ %ackup is per"or!ed using virtual tape li%rary