Data Replication Options: Common Usages: Data Replication Architectures: Options

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Enterprise Data Replica

Yılmaz Çankaya, Uzman Araştırmac

BSG (Information Systems Security), Tüb BSG (Information Systems Security), Tüb

ation and Security

cı

bitak UEKAE bitak UEKAE

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Definition of Enterpr

Data

Options implem li t replicat Host-B Transa

Comm

For wh techno Di t Disaste

Data

There a along w Single

rise Data Replication

Replication Options:

s you may need to consider during a

mentation decision process. They can co-exist in

ti i

tion scenario.

Based, Appliance-Based, Storage-Based , action-Aware, Mirroring or Shadowing

mon Usages:

hich usages could we utilize data replication logies.

R M i t B k

er Recovery, Maintenance, Backup

Replication Architectures:

are a few implementation architectures available with their pros and cons.

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Data Replicatio

Host-Based:

Host based rep to have its data

Appliance-Ba

Unlike the host the replication i path between th pat bet ee t

Storage-Base

Storage-based based and app Definition of Enterprise Data Replication

pp

Transaction-A

Transaction-aw

Mirroring or S

Shadowing is a network bandw

on Options

plication resides on the application server that needs a replicated.

ased:

-based solutions, all intelligence needed to perform is housed in an appliance that resides in the I/O he host and the storage.e ost a d t e sto age

ed:

replication combines the best aspects of host-liance-based solutions

Aware:

ware replication offers transaction-level replication.

Shadowing:

an asynchronous process, thus requiring less width than synchronous mirroring.

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Common Usag

Disaster Recovery:

Remote replication can be implemented from the one or more remote sites.

Maintanance:

Various servers may need periodic maintenance that can take hours to complete.a ca a e ou s o co p e e

Backup:

Backing up data is frequently the biggest daily challenge for an IT manager. Backup windows g g p have been shrinking while data has been growing

es

production site to

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Data Replicatio

Single Datace

Minimum Ava

disasters. Ge

Single Master

There is a ma

sites replicate

services.

Multi-Master.

Definition of Enterprise Data Replication

All clustered s

is consistent.

on Architectures

enter.

aibility. No protection in case of natural

ographical scalability is not an option.

r.

aster datacenter that writes go to and other

e to The replicate sites provide read-only

e to. The replicate sites provide read only

servers are serving reads and writes. All data

NASDAQ follows this strategy.

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Data Replication a

Di t ib t d S

t

Distributed Systems

Distributed DBMS

Peer-To-Peer (P2P) Systems

Data Grids / Grid Computing

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Distributed DBMS

ROWA and

The most sim All (ROWA) p to read an ite convenient lo convenient lo

Quorum Ba

An interesting of replicas an correctness a quorums

Commit Pr

Two-phase c commit proto achieving rep achieving rep

Distributed

Strategies

A history of s

Data Replication

and

A history of s Data Storage

Distributed Systems

d ROWA-Available

mple replica control protocol is the Read-One-Write-protocol. In ROWA protocol, a transaction requests em and the system fetches the value from the most ocation

ocation.

ased

g proposal to update only a subset nd still not compromise with

and consistency is based on

rotocol in Distributed DBMS

ommit (2PC ) protocol is the most widely accepted ocol in distributed DBMS environment that helps in

plica synchronisation plica synchronisation

d Data Storage Systems and Replication

strategies used to achieve replication in Distributed strategies used to achieve replication in Distributed

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Data Grids / Grid C

Data Replication

and

Distributed Systems

The Grid

is a heteroge

Computing

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Data Replication

Dist

Distr

parti

t

natu

Enc

As th

tran

(i.e.

n and Security

tributed Systems and Security

ributed systems make security assurance

icularly difficult, as these systems

ll

d i i t ti

d t

t b

d i

urally cross administrative and trust boundaries

cryption

he modest precaution, encryption of the

nsfer wire should be provided.

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Security of B

Encryptio

But while en and managin workable ha workable ha

Backups

What if som What if som steal your co

Host-Bas

Remote A

Any compan i l requires solu protection

Stay Up-t

y

p

ackup Data

on Key Management

ncryption is proliferating, the means for tracking ng the keys that make encryption schemes as not kept up

as not kept up.

eone were to break into your office and not only eone were to break into your office and not only omputers but also your external drives

sed vs. Appliance-Based Tape Encryption

pp

p

yp

And Branch Offices

ny with remote offices or branch offices

ti th t t t d t

utions that can support corporate data

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Challenges in Da

Read-on

U d t t

Update t

Managin

Data Consi

High precisio consistency (

D

ti

Downtime

If strict data c is severely af

Maintenanc

If the files are storage spac

Lower write

Performance İn application environment environment, update multip

ata Replication

nly queries

t

ti

transactions

ng mobile clients

istency:

on applications may require strict

(i.e 1SR) of the updates made by transactions.

d

i

li

ti

during new replica creation:

consistency is to be maintained,performance ffected if a new replica is to be created

.

ce overhead:

e replicated at more then one sites, it occupies ce and it has to be administered.

e performance:

e of write operations can be dramatically lower ns requiring high updates in replicated

because the transaction may need to , because the transaction may need to ple copies.

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Today’s Technolo

Dis

DC

da

Vir

hig

Mo

fre

ogy in Data Replication

stributed Cache Products:

CPs, so called in-memory data grids,

ta fabrics.

rtualization:

rtualization is quickly becoming one of the most

ghly utilized technologies in business today.

obile Environments:

obile environments are characterized by a

equent change in their resources

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Summary

Definition of Data Replication

p

Data Replication Options Common Usages

Data Replication Architectures

Data Replication and Distributed Sys

Distributed DBMS

ROWA and ROWA-Available Quorum Based

Commit Protocol in Distributed DBMS Distributed Data Storage Systems and Re Peer-To-Peer (P2P) Systems