Module-5 (Lesson 3) Backup and Recovery

8/12/2019 Module-5 (Lesson 3) Backup and Recovery

1/17

Module

5(Lesson-3)Backup and Recovery

By: Amit Wadhwa

1


2/17

Topics

Covered:

Backup granularity Backup method Backup

architecture Backup and

recoveryoperations

2


3/17

What is Backup?

Organization also takes backup to comply with regulatoryrequirements

Backups are performed to serve three purposes: Disaster recovery

Operational recovery Archive

3

It is an additional copy of production data that is created and retained forthe sole purpose of recovering lost or corrupted data.

Backup


4/17

Key Backup/Restore Considerations

Customer business needs to determine following: What are the restore requirements RPO & RTO? Which data needs to be backed up? How frequently should data be backed up? How long will it take to backup? How many copies to create? How long to retain backup copies? Location, size, and number of files?

These are rquired/helpful in selecting and implementing

a specific backup strategy. 4


5/17

Backup Granularity

Full Backup : corresponds to backup of complete data in production volumes Incremental backup : copies data that has changed

since last full or incremental backup, whichever isrecent. Cumulative Backup: copies data that has changedsince last full backup/most recent cumulative backup.

5


6/17

Backup Granularity

6

Full Backup

Su Su Su Su Su

Incremental Backup

Su Su Su Su Su M T Th W F S M T Th W F S M T Th W F S M T Th W F S

Cumulative (Differential) Backup

Su Su Su Su Su M T Th W F S M T Th W F S M T Th W F S M T Th W F S

Amount of Data Backup


7/17

Restoring from Incremental Backup

7

Incremental

Tuesday

File 4

Incremental

Wednesday

Updated File 3

Incremental

Thursday

File 5 Files 1, 2, 3, 4, 5

Production

Friday

Files 1, 2, 3

Monday

Less number of files to be backed up, therefore, it takes less timeto backup and requires less storage space

Longer restore because last full and all subsequent incremental backups must be applied

Full Backup


8/17

Restoring from Cumulative Backup

8

Cumulative

Tuesday

File 4Files 1, 2, 3

Monday

Full Backup Cumulative

Wednesday

Files 4, 5

Cumulative

Thursday

Files 4, 5, 6 Files 1, 2, 3, 4, 5, 6

Production

Friday

More files to be backed up, therefore, it takes more time to backup and requires more storage space

Faster restore because only the last full and the last cumulative backup must be applied


9/17

Backup client

Gathers the data that is to be backed up and send it tostorage node

Backup server Manages backup operations

and maintains backupcatalog

Storage node Responsible for writing data

to backup device Manages the backup device

Backup Architecture

Storage Node BackupDevice

Backup Client(Application Server)

Backup Data

Backup Server

TrackingInformation

Backup Catalog

Backup Data

9


10/17

Backup Operation

10

1

Application Servers(Backup Clients)

Backup Server Storage Node Backup Device

2

7

3b 4

5 3a

6

3a Backup server instructs storage node toload backup media in backup device.

Backup server initiates scheduled backup process. 1

Backup server retrieves backup-relatedinformation from the backup catalog.

2

Backup server instructs backup clients tosend data to be backed up to storage node.

3b

Backup clients send data to storage node andupdate the backup catalog on the backup server.

4

Storage node sends data to backup device.5

Storage node sends metadata and mediainformation to backup server.

6

Backup server updates the backup catalog. 7


11/17

Recovery Operation

11

Application Servers(Backup Clients)

2

6

3

5

4

4

Backup Server Storage Node Backup Device

2 Backup server scans backup catalogto identify data to be restored and theclient that will receive data.

3 Backup server instructs storage nodeto load backup media in backup device.

4 Data is then read and send to backup client.

5 Storage node sends restore metadatato backup server.

6 Backup server updates the backup catalog.

1

1 Backup client requests backup server fordata restore.


12/17

Backup Methods Two methods of backup, based on the state of the application when

the backup is performed Hot or Online

Application is up and running, with users accessing their dataduring backup

Open file agent can be used to backup open files Cold or Offline

Requires application to be shutdown during the backup process

Bare-metal recovery OS, hardware, and application configurations are appropriately

backed up for a full system recovery Server configuration backup (SCB) can also recover a server

onto dissimilar hardware12


13/17

Server Configuration Backup Creates and backs up server configuration profiles, based on user-

defined schedules Profiles are used to configure the recovery server in case of

production server failure Profiles include OS configurations, network configurations,

security configurations, registry settings, applicationconfigurations

Two types of profiles used Base profile

Contains the key elements of the OS required to recover theserver Extended profile

Typically larger than base profile and contains all necessaryinformation to rebuild application environment

13


14/17

Backup Topologies

14

Backup DeviceApplication Server/Backup Client/Storage Node

Backup Server

MetadataBackup

Data

LAN

Direct-Attached Backup


15/17

LAN-based Backup

15

LAN

Storage Node Backup Device

Backup Data

Application Server/Backup Client Backup Server

Metadata


16/17

SAN-based Backup

16

Backup DataMetadata

Backup DeviceBackup Server Application Server/

Backup Client

Storage Node

LAN FC SAN


17/17

Documents

Module-5 (Lesson 3) Backup and Recovery