HP StoreOnce B6000 Betriebsanleitung

Executive Summary .............................................................................................................................. 2

Scenario Summary ....................................................................................................................... 4

Introduction: Issues Associated with Remote Office/Branch Office Backup.................................................. 5

Solution Scenarios ............................................................................................................................... 7

Scenario 1 –Client based backup over the WAN using HP Data Protector synthetic full functionality.......... 7

Scenario 2 –Low Bandwidth Replication using HP D2D and HP Data Protector for up to 24 remote sites .... 9

Scenario 3 –Low Bandwidth Replication using HP VLS and HP Data Protector for Regional data centers... 11

Summary....................................................................................................................................... 13

Glossary of Terms .......................................................................................................................... 14

Appendix A – HP VTL Family with Deduplication and Low Bandwidth replication ...................................... 18

Appendix B – HP Data Protector Synthetic Full Backup ........................................................................... 19

Appendix C – Deduplication is the enabler for Low Bandwidth replication. .............................................. 21

Appendix D – HP Data Protector Product Structure & Support Matrix........................................................ 23

Call to action .................................................................................................................................... 25

ROBO and regional data centre data protection

solution scenarios using HP Data Protector software,

HP VTL systems and Low Bandwidth replication

Executive Summary

Protecting data across all corporate locations is critical for business, legal and regulatory compliance

purposes in today’s information age. Too often, business critical data at remote locations is

inadequately protected, exposing the business to the risk of lost data and lost productivity. A study

conducted by industry analyst Enterprise Strategy Group found that the top three IT priorities for

remote office / branch office (ROBO) locations were driven by business priorities: Improve

information security, ensure regulatory compliance, and improve disaster recovery1.

Some of the biggest challenges in remote office data protection cited by organizations are:

-Limited IT staff and limited backup & recovery skill set

-High capital and operating costs of remote office backup & recovery

-Inability to complete backup jobs within scheduled backup window

-Improving the time it takes to recover data

Centralizing the control, management and policies of remote location backup and recovery

1Enterprise Strategy Group Research Report: Branch Office Optimization, 2007

This whitepaper shows how recent developments in the HP data protection portfolio can overcome

these obstacles through the use of centralized management with HP Data Protector software and the

use of Deduplication and Low bandwidth replication on HP’s virtual tape library products. The

whitepaper examines three scenarios which cover a wide range of possible implementations.

Figure 1: Enterprise deployment with small and large ROBOs

Figure 1 shows the HP Vision for “Protecting data anywhere” using these technologies.

The HP Vision for ROBO based data protection is that backup data should be accessible wherever it

is required which in some cases requires it to be in 3 locations as well as on physical tape. This gives

maximum flexibility in restore options or DR options. When managed through a single backup

application this allows the personnel with relevant expertise to recover the data from multiple

locations , be it recovering data at the ROBO site from the ROBO appliance but managing the

recovery from the data centre or regional data centre, or even recovering at the ROBO site itself if the

relevant expertise is present. The HP vision also realizes that backup appliance demands for ROBO’s

and data centers are very different both in terms of price and performance which is why the HP vision

uses different technologies appropriate to these different customer requirements. Multi-hop replication

and further combined appliance storage consolidation in the data centre are possible future

enhancements to this vision. As we discuss various scenarios below it is worth noting some unique

functionality enhancements between HP data protector and HP D2D & VLS appliances to allow this

vision to be delivered today.

Scenario Summary

Scenario 1 Scenario 2 Scenario 3

Typical sizing

200+ ROBO’s with full

backup size of 100GB

& incremental backups

of 10%

100+ ROBO’s with

200-500GB full

backups

100+ ROBO’s with

200-500GB full

backups

PLUS

Up to 4 regional data

centres with 7.5TB to

300TB backups

requiring DR solution

Problem

Large number of ROBO

sites with small backup

volumes

Significant backup

volume at remote sites

and a requirement for

local recovery at the

ROBO site.

All above data

requiring to be

consolidated at main

data centre

Solution

HP Data Protector

Synthetic full backups

over WAN to HP D2D

with NAS Emulation

Up to 24:1 fan-in from

small D2D units in

ROBO to larger

consolidated single

D2D in data centre

Offload to Physical

tape if required

HP D2D for ROBO’s,

HP VLS for Regional

Data Centres

D2D to VLS copies at

regional data centre

using HP data protector

and onward replication

to main data center

Why HP

Synthetic full

functionality allows

object consolidation

and ensures only small

volumes of data

transmitted over WAN.

Scalable up to 100s of

ROBO sites

Recovery to ROBO

from data centre under

data centre control

Only HP offers a low

cost entry point to

deduplication and low

bandwidth replication

for ROBO’s ( sub

$3000 )

Target D2D can be

tape to tape copied to

physical tape using

special functions in HP

Data Protector

End to End control

from HP data protector

Only HP offers both a

low cost entry point to

deduplication and low

bandwidth

replication(D2D) AND

a highly scalable, high

performance

deduplication

appliance (VLS) for

Enterprise

environments.

Target VLS can be tape

to tape copied to

physical tape using

special functions in HP

data protector

End to End control

from HP data protector

The key learnings from a study of these scenarios are:-

Using physical tape at ROBO’s and performing daily off-siting of physical media will become a

thing of the past, physical tape will be replaced by WAN based backup or a HP virtual tape

libraries so that the whole process is automated and managed from a regional centre or main data

centre. The automation will vastly improve the reliability of backup in the most remote offices where

there are typically no trained IT staff.

Deduplication technology is the key enabling technology for Low bandwidth replication which is

revolutionizing ROBO backup. Deduplication enables the “unique” pieces of data to be identified

and replicated, in turn this means much smaller inter-site links are required to effectively transmit

large apparent quantities of data. Up to 95% bandwidth saving is achievable. Low bandwidth

replication now ensures we can cost effectively “protect data anywhere”. Low bandwidth

replication can be “throttled” to use a percentage of an existing link, so as not to affect applications

performance running on the same link. One key advantage for HP is its ability to provide “scale

down” deduplication devices that are very cost effective and an ideal fit for ROBO’s.

Consolodation of replicated data from many ROBOs onto a single device at the regional data

center or main data center allows for further cost efficiencies.

Physical tape does still have a role to play in larger regional centres and main data centres, as a

long term archive media for customers that have a need to keep data for years. It is relatively

simple to integrate physical tape into a virtual tape environment because all backup software

supports tape to tape copy. Certain compliance regulations also demand additional copies of data

be made to physical tape.

Close integration of HP D2D & VLS devices with HP data protector software allow for complete end

to end solutions to be realized. Features such as synthetic full backup, Object copy and the ability

for HP Data protector to detect replicated cartridges and incorporate them into its internal catalog

database ensure the solution is always “Disaster recovery ready”. Management of the whole

process from anywhere in the network ensures a tight integration and expeianced IT staff access to

all the relevant components.

Introduction: Issues Associated with Remote Office/Branch

Office Backup

For many years remote office/branch office backup and restore has been an issue with IT managers.

Some of the challenges they faced were:-

Having to implement physical tape infrastructure and operators at what could be a large

number of sites.

Paying service providers to pick-up store and retrieve tapes to and from an off-site facility.

Data in transit (physical tapes) are prone to being lost, and the company relies entirely on a

3rd party for their ability to recover from a disaster.

Untrained IT personnel at the most remote sites, who may have been responsible for changing

physical tapes, and then off-siting the tapes. A very manual but important process which may

not always have been executed well.

Reliability of the process – more prone to errors because it was manual and required regular

human intervention. Physical tape drive cleaning and tape rotation added to the complexity.

Errors and failures not always accurately diagnosed. Low restore success rate at a local level

was probably a major issue.

If the backups were large or slow and only a single backup device was available – the

backup window could be large and extend into the normal business hours affecting critical

business applications.

Backup over the company WAN to a central site was restricted because of the relatively high

volumes of data that needed to be backed up over a relatively low speed link.

It was very difficult to prove to auditors that a comprehensive site disaster recovery plan was

in place and effective.

The solution to these issues is:-

To automate the process End to End with a single management console across the entire

estate.

Extensive use of virtual tape libraries with deduplication and low bandwidth replication to

automate the process. This allows flexible provisioning of backup resources to meet changing

customer needs, and offer more effective storage utilization, ability to reduce backup

windows and provide faster single file restores.

Make the best use of existing WAN links from ROBO sites to Regional data centres and from

regional data centers into main data centers by using Synthetic full backups and Low

Bandwidth replication.

Perform backup object consolidation by using technologies such as HP data protector

synthetic full backups ( See Appendix B): Only one initial full backup; no file is stored

multiple times, and therefore, can reduce required backup space/media.

Only changed files need to be backed up, this enables fast backup of file servers hosting

millions of files allowing more frequent backup.

Spend Less time on physical tape management: There is no tedious tape management with

synthetic full backups or virtual tape libraries..

To be able to maintain and manage Backup copies in multiple locations depending on

retention policies and disaster recovery (DR) policies

Solution Scenarios

The scenarios discussed below cover a wide range of implementations that are possible using HP

Virtual Tape Libraries and HP Data Protector software, from a small business that has several outlets to

a major corporation that has hundreds of remote/branch offices, several regional data centres and

multiple main data centers.

Scenario 1 –Client based backup over the WAN using HP Data

Protector synthetic full functionality.

Figure 2: Client based backup over the WAN using HP Data Protector Synthetic Full functionality

Key Message: Cost effective Remote Office Backup with low WAN traffic

In this first scenario we follow a basic client agent backup process, suitable for a large number of

ROBO sites where relatively small amounts of data need to be protected. In order to minimize the

amount of data that needs to be transmitted over the WAN we can use the “synthetic full” feature of

HP Data Protector. After the initial full backup we only need to perform incrementals thereafter. The

backup data is sent to a “File Library” device ( in this case a NAS share with deduplication on the

D2D4000 unit), where a “synthetic full” can be created at any time for a restore. Alternatively there is

another feature in HP Data Protector called virtual full that is similar to synthetic full but uses less

storage space, but can only be implemented on a file library device such as an HP MSA2000 disk

array. Finally again under data protector control the synthetic fulls can be copied to physical tape for

long term archiving.

The key benefits to the customer of this solution are:-

Object consolidation using synthetic full backups to minimize WAN traffic

Variable Retention policies. Short term on D2D, Long term on tape for archive.

Fast recovery from D2D4000 with NAS* emulation

HP Data Protector manages the entire process from the main data centre.

Reduced WAN utilization (because small incremental backups)

This solution does not provide a local source of the data for recovery. A synthetic full created at the

regional centre is required and the necessary files to be restored need to be transferred over the

WAN. This could take some time depending on size.

*Available late 2009

Scenario 2 –Low Bandwidth Replication using HP D2D and HP Data

Protector for up to 24 remote sites

Figure 3 : End to End Low Bandwidth replication solution with regional centre consolidation, all under HP Data Protector

Control

Key message: Backup Consolidation & Cost effective Disaster Recovery for larger ROBO’s

In this next example the volumes of data on the remote sites are much larger; 500GB perhaps, and

the customer really needs to have local restore capability. So in this scenario each remote site has a

local D2D2500 with deduplication and the D2D is using virtual tape library emulation mode. A user

capacity of 1.5TB can yield up to 30TB of backup storage with a 20:1 deduplication ratio, after

several backups have been retained over 2-3 months. If long retention is not required then the

D2D2500 can support even larger backups but retained for shorter periods. Direct restore at the

ROBO from the D2D unit is always possible because each ROBO site contains a complete Data

Protector environment of cell manager and media server and is “self-sufficient” from a restore

perspective. The local D2D2500’s (sources) can also be configured to replicate only the changed

data across a low bandwidth link to the regional centre where a larger D2D4112 device resides. A

D2D4112 can support a fan-in of up to 24 D2D sources, and only requires a single licence to enable

replication. This allows major storage consolidation benefits at the regional data centre. The

replication process replicates the changes in virtual cartridges from the ROBO to the regional centre.

On a regular basis the HP data protector cell manager 1 polls the D2D4112 to detect replicated

cartridges so it can update its internal database (IDB) with their contents. This ensures that in the event

of a disaster at the ROBO the regional centre is immediately aware of which virtual tapes are

required for recovery. Finally data from the D2D4112 at the Regional centre can be easily copied to

physical tape at regular intervals using the “object copy” functionality within HP Data Protector.

The D2D4112 as well as acting as a replication target for the ROBO sites can also act as a source

for backups from the regional centre servers as can be seen in Figure 3.

This solution provides robust disaster recovery, should a total disaster occur at the source (ROBO), the

data is safely already offsite at the target ( regional data centre). The ROBO site can then be re-

constructed by either:-

a) Re-building a new ROBO server and restoring data at the regional centre using the

replicated data

b) Rebuilding the server at the ROBO site and reverse replicating the critical data from the

D2D4112 in the regional centre. Reverse replication involves the total contents of the backup

being copied back from the replication target to the source, and may take some time if larger

quantities of data are required to be reverse replicated over a low bandwidth link..

c) Offloading critical data to tape at the regional center and transporting back to the ROBO

with the necessary tape hardware for recovery.

The key new area of interest here is the Low Bandwidth link. For the majority of ROBO sites link

speeds as low as 2Mbit/sec can be used ( dependent on volumes of data to be replicated). The HP

suggested usage models for low bandwidth replication are

Use 100% of the link bandwidth to complete replication in a fixed window (12Hrs). This is for

businesses that are not necessarily 24x7 and can afford a window dedicated to replication.

Within the D2D unit it is possible to configure “throttling” of the link and allow the replication

to take place over a 24 hour period. This is for businesses that also use the WAN link for

applications, and where giving the whole link over to replication would affect application

performance.

To calculate the size of the regional centre D2D device and the size of the link required (either with

fixed window or with throttling) HP provides a comprehensive sizing tool available from:-

http://www.hp.com/go/storageworks/sizer

As for scalability - In the example above we show 24:1 fan-in, if we had > 24 ROBO sites we would

have multiple separate D2D4112 devices at the regional data centre.

The key benefits to the customer of this solution are:-

Backups performed and controlled locally, reliability of backups not dictated by WAN

availability and remote media server as in scenario 1

Fast local recovery when needed.

Ability to store several months of backups locally at ROBO with D2D deduplication.

Significant bandwidth reduction – up to 95% savings in bandwidth compared to all contents

being replication rather than just changed data detected by deduplication.

Cost effective consolidation in the regional centre up to 24 ROBO D2Ds (fan-in) AND

D2D4112 can be used for local regional centre backups as well.

Very Flexible Disaster recovery options.

Easy offload to tape with HP Data Protector Object copy.

HP Data Protector manages the entire process from the main data centre.

Option to manage single ROBO’S from the Regional Centre or Data Centre

Andere Handbücher für StoreOnce B6000

Inhaltsverzeichnis

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