S U M B E R K E P U S TA K A A N : C D N . T T G T M E D I A . C O M / . . . / S T OR A G E _ M A N A G E M E N T _ J A M I E _ G R U E N E R . P P T

7 MUST-KNOW DISASTER RECOVERY STRATEGIES

J A M I E G R U E N E R

S E N I O R A N A LY S T , E N T E R P R I S E I N F R A S T R U C T U R E

T H E Y A N K E E G R O U P

S U M B E R D A R I : C D N . T T G T M E D I A . C O M / . . . / S T O R A G E _ M A N A G E M E N T _ JA M I E _ G R U E N E R . P P T

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S U M B E R K E P U S TA K A A N : C D N . T T G T M E D I A . C O M / . . . / S T OR A G E _ M A N A G E M E N T _ J A M I E _ G R U E N E R . P P T

WHAT YOU WILL LEARN IN THIS SESSION . .

1.The Main Goal: Bullet-proofing Disaster Recovery Strategies

2.Remote Replication vs. Mirroring Strategies 3.Disaster Recovery and Virtualization: A New

Angle4.Integrating Mirroring and Replication into

Disaster Recovery Strategies5. Metro SANs: Options for Remote Mirroring And

Replication6.Your Network Options: Questions to Guide You7.The Outsourcing Alternatives: Things to

Consider

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THE GOAL: BULLET-PROOFING DISASTER RECOVERY STRATEGIES

You’ve heard the statistics ~ $5 billion in computing infrastructure lost in 9-11

tragedy Close to 100 businesses declaring disasters in NYC

You’re here for a reason 9-11 was a call to action for all of us Disaster Recovery and Business Continuity Strategies

must be done – this is only one leg of a multi-leg strategy

You’re entering a new era It is now about Business Continuance and Risk

Management Preserving data is an imperative

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DEFINING TERMS: REMOTE MIRRORING AND DATA REPLICATION

Remote Mirroring generates a mirrored image of data on two or more disks

Data Replication scans data periodically for changes and copies new data to the other disk or file system on another system

Factors to considerValue of data (and lost data) being backed upCosts for network bandwidth and softwareYour existing infrastructureProduct features (OS, File System, Disk or Application)

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Checklist

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MEASURING DATA PROTECTION: POINT-IN-TIME TO SYNCHRONOUS

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Data Protection

Network Bandwidth Consumed

Point In Time

Asynchronous

Synchronous

Tip

There will be a need formultiple tools to protect data

Lost Transactions Line of Tolerance

More

Less More

Semi-Synchronous

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QUESTIONS TO CONSIDER WHEN LOOKING AT REMOTE MIRRORING AND REPLICATION

What are you protecting? (applications, transactions, files, disks) What level of protection do you need?

(We’ll come back to this!) What are your network requirements? What is your expected budget for this project? Is the ROI greater than acquisition costs? What will best fit your larger business continuity strategy?

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Best Practice

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THE LUXURY SEDAN: DISK-TO-DISK REMOTE COPY

Key advantagesOperates at the disk level Can be (not always) less complex to set up and administer than host-based approaches

Can offer the benefit of capturing all application changes. . .

Key Disadvantages: CostlyLacks transaction knowledge or what the data representsCan be wasteful of network bandwidth if not properly set up

If operating in synchronous mode, can degrade application performance

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THE RISING ALTERNATIVE: BLOCK-AND-FILE REPLICATION

Fundamentals Makes comparisons and only copies changes (at disk or

file level)

Key Advantages Can be less expensive Can be flexible to replicate all enterprise data regardless

of disk system Copies only the most important files/data Many-to-one replication architectures available Limits amount of data transferred, reducing network load

and cost

Key Disadvantages Isn’t 100% availability of data

8Warning

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BLOCK AND FILE REPLICATION DETAILS YOU NEED TO CONSIDER

Less expensive, host-based (or array-based) file and block replication

Specific to storage vendor, OS or file system

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File WAN Replication

Block WAN Replication

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DATABASE REPLICATION

Typically done by replicating or mirroring log files

A number of variations:Continuous Mirroring: updates DBMS as changes(adds, updates, deletes) occur

Change Data Capture: captures DBMS changes and stores them until a predetermined replication time

Full Copy Refresh: replicates entire DBMS copy to target systems (done to resynchronize DBMS after outage)

Trigger-based native DBMS is not usually appropriate for DR because of high system and network overhead

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SNAPSHOTS: THE HOTSHOTS OF BACKUP

Establishes a separate identifiable storage entity and run operations against it

Primary purpose: backup, testing, conversion and batch process

Is dependent on OS, host and array support…Advantage: it takes up less network

bandwidth than mirroringDisadvantage: resynchronization of data is

an art If you do not resynchronize, you must build snapshot mirror totally from scratch

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NEW KID ON THE BLOCK: VIRTUALIZATION AND DISASTER RECOVERY

Virtualization software offers a new alternative Data replication (over both IP and Fibre Channel) Snapshot High Availability Fail-over A cost-effective approach to disaster recovery

Key Challenges Recreating the virtualization system can be difficult Specifying file level information for replication can be

difficult Still a relatively new technology, so test well Research virtualization players thoroughly

Ask hard questions about number of customers doing this How are issues of network performance and security handled?

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Warning

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PRIORITIZING DATA: INTEGRATING MIRRORING OR REPLICATION TO YOUR STRATEGY

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Amount OfData

Recovery Time

DelayedImmediate

LessMore

More

Less

Importance Of Data

Hot SiteRemote Disk Mirroring

Data Replication

Campus Disk Mirroring

Snapshot

Electronic Vaulting

Tape Onsite

Tape-Backup Offsite

Tool

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OK, NOW WHAT? IT’S THE NETWORK, STUPID

Long-distance Remote Mirroring/Replication requires significant network integration

Mission: Connecting two or more islands of storage Could be SANs, hot sites, remote disk or tape

Myriad of network transport choices boil down to two fundamentals (from the POP out)

Fibre IP

Where to Start: Evaluate Network Requirements

Ask storage vendors for requirements Map that to service provider bandwidth services

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SPECIFIC NETWORK CHALLENGES FOR REMOTE MIRRORING AND REPLICATION

Enterprise network performance is many times slower than storage performance

Things You Could Consider What tools do the remote mirroring/replication vendor

provide for performance on a Metro SAN? Network throttling – adjusting data amounts sent over wire Compression – compressing data to take up less network

bandwidth Time-stamping – marking data at time saved or accessed

Latency isn’t your friend Measurable time it takes for an I/O transaction to reach destination Distance is a factor – especially when extending data native limit Storage traffic requires high bandwidth, low latency connections

not typical of IP

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Tip

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METRO SAN PUZZLE PIECES

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Headquarters

Remote Site

PrimaryDisk Storage

RemoteDisk Storage

RemoteTape Library

Mirroring/Replication Software

Edge of Network Equipment (Director, Router or DWDM)

Service Provider Connectivity Services

Key Features

ATM, T3/E3, OC3+or Fibre Optic (DWDM)

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METRO SAN NETWORK TRANSPORT OPTIONS

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Network Protocol

Performance Length of Distance

ESCON Full performance (200-M bits/sec. unidirectional)

8 km for full performance, 50% performance @ 20 km

FICON Bi-directional channel protocol, runs over at 1.063 G bit/sec.

100 km distance limitation

Dark Fibre Dedicated Fibre (depends on transport)

10 km without long-wave transceivers

iSCSI, iFCP, FCIP Still in proof-of-concept stage, but promise of 1 TB per hour over IP

Depends on applications, service, connection points – FCIP - primary for Metro SANs

DWDM - Gigabit (Optical) Ethernet (Most common)

Requires high-speed IP network to connect storage islands, OC3 or <

Depends on applications, service, connection points and routers used (DWDM)

Key Features

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IP NETWORK OPTIONS

Private Router BackbonesLeased, dedicated linesOptimized for performance (racing the sun)

xSP VPNsCustomer purchases edge routers and ISP provides shared backbone

Leverages Multiprotocol Layer Switching (MPLS) for better Quality of Service

Internet . . .Not a disaster recovery tactic I would trust

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TIPS TO CONSIDER WHEN SPEAKING WITH YOUR SERVICE PROVIDER

Ask your xSP to provide you what their expertise is in storage services

Consider how you could leverage your existing connectivity services to establish a cost-effective service contract for your backup services

Ask for a latency/network performance SLA Your primary xSP should have partners to assist with storage

services if they don’t

Consider leveraging storage vendor relationships to find service providers that can do integration

Do or have done a network analysis to determine requirements for your backup services

Determine if outsourcing is an option

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Checklist

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METRO SAN CHALLENGES: THINGS YOU NEED TO ASK ABOUT IP

Latency and Bandwidth SecurityComplexityQuality of Service (QoS)Dropped PacketsManageabilityNOTE: IP storage switch vendors are

trying to solve these things – so gauge them based on this

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Checklist

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DOES OUTSOURCING MAKE SENSE?

Determine if outsourcing disaster recovery services for Data Mirroring and Replication services

Do I have the skills, personnel and infrastructure?

Outsourcing provides a number of advantagesEnables enterprise to focus on core competenceSpeeds IT’s ability to maintain and return to business operationsLeverages expertise and more plentiful specialized resourcesOffers mirrored solutions for immediate recoveryProvides problem resolution expertise that speeds delivery of services related to backup, security and performance monitoring

Delivers professional services to assist in design of a customized business continuity plan

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Best Practice

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ASK FOR HELP FROM A PROFESSIONAL . . .

This is a complex proposition

Storage vendors will assist with best backup technologies

Service Providers will offer options for services

Integrators with storage and networking practices are best candidates for additional implementation

they are still rare in the world

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EVALUATE ROI FOR DISASTER RECOVERY

Come up with a ROI calculation for your data protection strategy

Guidelines to rememberCalculated over three-year termThe higher the ROI, the more favorable the projectTCO vs. ROI – ROI wins out

Key factors to be included in ROI analysisCosts: downtime, personnel, assetsReliability: data replication, mirroring, backupsSystem performance: how is systems and software utilized

Calculate savings: improved performance, revenue, processes 23

Best Practice

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CONCLUSIONS

Don’t forget the fundamental goal: Disaster Recovery

Consider your options for mirroring/replication and make a metric to measure them by

ROI analysis is one way of measuring options

Be cautious of new technologiesNew IP storage networking technologies and software offer new options – but you need to be savvy in deployment

There’s not one solution – strategize on ways to prioritize your data protection

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