1. Small Office Home Office Continuous Data Protection (SOHO CDP)
Sponsored By: SYMANTEC
Domain :Systems Applications ( Data Protection )

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Agenda
What is Continuous Data Protection (CDP)?
Overview Of Continuous Data Protection (Concept)Overview Of Continuous Data Protection (Concept)
Problem definition
Technological SpecificationsTechnological Specifications
Modules in CDPModules in CDP
CDP Software FeaturesCDP Software Features
ConstraintsConstraints
Future DevelopmentsFuture Developments

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What is Continuous Data Protection (CDP)?
A methodology that continuously captures or tracks data
modifications
All data changes are stored independent of the primary data
Enables recovery points from any point in the past corresponding to
modifications
CDP Systems provide fine granularities of restorable objects to many
variable recovery points

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Overview Of Continuous Data Protection (Concept)Overview Of Continuous Data Protection (Concept)

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Problem DefinitionProblem Definition
To design a Small Office/Home Office oriented Continuous DataTo design a Small Office/Home Office oriented Continuous Data
Protection SoftwareProtection Software
The software must be able to store changes and backup continuouslyThe software must be able to store changes and backup continuously
data folders specified by the userdata folders specified by the user
The software must support remote browser based access, retrieval andThe software must support remote browser based access, retrieval and
efficient storage, search and retention management.efficient storage, search and retention management.

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CDP Software FeaturesCDP Software Features
VersioningVersioning
Search by version and filename/contentSearch by version and filename/content
Access control for Administrator and clientAccess control for Administrator and client

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Technological SpecificationsTechnological Specifications
Client-server architecture with windows XP on both client and serverClient-server architecture with windows XP on both client and server
Mini Filter Driver on client side using WDKMini Filter Driver on client side using WDK
Backup – Using service in VC++Backup – Using service in VC++
Retrieval – Using GUI in ASP .NETRetrieval – Using GUI in ASP .NET

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Modules in CDPModules in CDP
1. Filtering1. Filtering
User modifies the active file.User modifies the active file.
Minifilter filters the specific IRPs.Minifilter filters the specific IRPs.
Gets information of the file that is modified.Gets information of the file that is modified.
A copy of the file is made, renamed and stored at a temporaryA copy of the file is made, renamed and stored at a temporary
location.location.

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...Other Legacy Filters AND Filter Manager Instances...
I/O Path with The Filter ManagerI/O Path with The Filter Manager
NtReadFile() / NtWriteFile(), ...
I/O Manager
CacheManager
FAT NTFS RDR
Filter Manager Instance
IRP + Fast-I/O Interfaces
Legacy 3rd
Party Filter Driver(s) (e.g. Replication)
Filter Manager Instance
Mini-Filter
Mini-Filter
Mini-Filter
Mini-Filter
Mini-Filter
Consistent Invocation
(packet/call-back mechanism)
Other legacy & filter manager instances...

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Client Active files Client saves the changes
to an active file
Various IRPs are
released
Specific IRPs are
captured by mini
filter
A renamed copy of file is
stored in a temporary location
for transfer
Filtering

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Modules in CDPModules in CDP
2. Backup2. Backup
The renamed file is sent to the server from the temporary location.The renamed file is sent to the server from the temporary location.
The temporary copy on client side is deleted.The temporary copy on client side is deleted.
The server stores the versions of files corresponding to the clients.The server stores the versions of files corresponding to the clients.

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Files from temporary
location
File name, location and time
stamp are sent to the server
A file with same name is
created at a similar
location on the server
File content is sent to
the server
The file on the server is
updated and saved as a
new version
The temporary copy on
client is deleted
Continuous Backup Process

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Modules in CDPModules in CDP
3. Retrieval3. Retrieval
Through a GUI, the client can view, search and select file versionsThrough a GUI, the client can view, search and select file versions
for retrieval.for retrieval.
Client can search file versions by name and/or timestamp.Client can search file versions by name and/or timestamp.
Files can be viewed or retrieved as per choice.Files can be viewed or retrieved as per choice.

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ConstraintsConstraints
 The size of storage volume.The size of storage volume.
 No protection against server crashNo protection against server crash

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Future DevelopmentsFuture Developments
Disaster Recovery (Client and Server)Disaster Recovery (Client and Server)
Incremental BackupIncremental Backup

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Thank YouThank You