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Master the Diving Catch: Storage Recovery Challenges & Prospects. Jon William Toigo Independent Consultant and Author Toigo Productions. Introduction and Welcome. “Masters of the Diving Catch” Topics for Discussion Fundamentals of Fielding the Ball How Free Agency is Wrecking the Game

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master the diving catch storage recovery challenges prospects

Master the Diving Catch: Storage Recovery Challenges & Prospects

Jon William Toigo

Independent Consultant and Author

Toigo Productions

introduction and welcome
Introduction and Welcome
  • “Masters of the Diving Catch”
  • Topics for Discussion
    • Fundamentals of Fielding the Ball
    • How Free Agency is Wrecking the Game
    • The Importance of Spring Training
  • Q&A
slide3
Then…
  • Early DR planning and storage recovery
    • Comparatively simple, “secretary-friendly”
    • Bolt-on to existing applications and host platforms
    • 1-for-1 replacement of mainframe and DASD
    • 24 to 72 hour recovery timeframe
and now
…and Now
  • DR in the Internet Era
    • 7x24x365
    • Lots of players — heterogeneous storage platforms supporting heterogeneous client-server hosting configurations
    • Faster, harder, and…
fundamentals for fielding the ball
Fundamentals for Fielding the Ball
  • Data is a irreplaceable asset
  • Goal: Avoid preventable data disasters…
    • Corruption of asset (security, virus protection, backups)
    • Interrupted availability (fault tolerance, meshed links, effective monitoring and management)
  • While minimizing impact of events that just can’t be prevented.
all disaster recovery strategies consist of
All Disaster Recovery Strategies Consist of…

- EITHER -

  • Redundancy
    • Duplicating assets on a “1-for-1” or consolidated basis
    • Deploying redundant assets at a sufficiently distant location to avoid regional disaster events

- OR -

  • Replacement
    • Fielding new assets within recovery timeframe requirements
with data redundancy is the only option
With Data, Redundancy is the Only Option…
  • Restoring data from damaged media (time consuming…)
  • Re-building data from original source materials (difficult or impossible…)
  • Recovering storage requires copies of current or near current data, suitable data hosting platform, and pre-planned strategy
characteristics of many storage environments raise challenges
Characteristics of Many Storage Environments Raise Challenges
  • Data growth is poorly managed in most shops (lack of tools, lack of time, lack of open management standards, lack of strategic planning)
  • Knee-jerk acquisitions of popular storage products leads to platform heterogeneity

Free Agency is Killing the Game…(Ask any Storage Vendor)

why effective storage recovery requires a diving catch
Why Effective Storage Recovery Requires a Diving Catch…
  • 1-for-1 replacement is increasingly costly
  • Consolidation strategies are more complex
    • Cross-platform data re-hosting takes time
    • Lack of software tools for data re-hosting requires use of tape as medium
    • Large (and growing) data volume calling efficacy of tape into question in some settings
cross platform data re hosting
Cross-Platform Data Re-Hosting

Production

Environment

Recovery

Environment

1-for-1

Storage Platform

Restoral

$$$

ideal approach
Ideal Approach

Production

Environment

Recovery

Environment

Re-host Data

On Consolidated

Minimum Equipment

Configuration

(e.g., Large Array or SAN)

reality
Reality

Software Tools for Mirroring

(e.g., EMC SRDF)

Only Work with

Same-Type Arrays

what about 3 rd party volume managers
What about 3rd Party Volume Managers?
  • Limited platform support
  • Vicissitudes of Host-Based Mirroring
  • Warranty hassles
the continuing need for tape
The Continuing Need for Tape

Production

Environment

Recovery

Environment

Tape provides the

Only Reliable

means for

Data Re-Hosting

To Arrays

or Zoned Fabrics

OR

FC SW

ironies
Ironies…
  • “Tape is dead, and SANs have killed it.” (?!?)
    • Tape accounted for nearly 75% of SAN deployments through 2000, and sharing tape continues to be a leading SAN deployment motivator
  • “Tape is too slow for high volume, mission-critical data. You need mirroring.” (?!?)
    • Ignores tape automation, increasing capacity and speed of tape drives, and multi-stream capabilities
    • Ignores nature of most databases: 80% static, 20% active
    • Ignores cost of mirroring
who s the fairest one of all
Who’s the fairest one of all?

MAN/WAN

LAN/SAN

SYMMETRICAL

MIRROR

(LOCAL,

SHORT DISTANCE,

LOW LATENCY)

ASYMMETRICAL

MIRROR

(REMOTE, 2ND PROCESS,

DATA NOT

SYNCHRONIZED)

pros and cons of mirroring
PRO

Fast recovery of data access

Less vulnerability to outage

Demonstrated track record

Adjustable to recovery requirements

New technologies (e.g., Wave Division Multiplexing) reducing cost of WAN/MAN interconnect

CON

Another process to monitor

Vendor lock-in because of platform-specific mirroring software

Three-tier configuration required to avoid latency in production applications

High-cost solution suited only to most extreme data recovery requirements

Pros and Cons of Mirroring
pros and cons of tape
PRO

Media price lower than disk

Well-designed strategy optimized for time-to-data

Improving media management capabilities

Low latency solutions can be designed

Multi-streams make multi-TB restores feasible

CON

Tape subject to wear and exposed to damage in transit (tape vaulting a potential solution)

Potential conflicts with virtualization engines

Disk prices are falling, capacities growing

On-line data is “better” than near-line or off-line data

Pros and Cons of Tape
facts are facts
Facts are Facts…
  • Most IT architects embracing HSM
    • Enabled by evolving infrastructure view of storage
    • Leveraging cheaper disk platforms (IDE/ATA drives), tape or optical for “near-line” configurations
    • “Content Networking”
  • Problems with fault tolerance through load balancing in storage fabrics remain — no silver bullets
  • Server-free backup remains a holy grail
    • Where does the metadata go?
    • Lack of granularity in “bare metal” backups
the rise of near line
The Rise of Near-Line

LAN/SAN

IDE/ATA PLATFORMS

OR

TAPE (OR OPTICAL)

FOR NEAR-LINE/STATIC

STORAGE

SCSI/FC

DISK ARRAY

FOR

ON-LINE/ACTIVE

STORAGE

Select hosting platform

Based on data characteristics

And cost criteria

the trouble with load balancing
The Trouble with Load Balancing

User

Load Balancers

Storage Servers

Fabric Switch

Data

Storage

Zone B

E-mail

Zone C

Database

Zone A – User Files

big issue potential choke point in tape based data restore
Big Issue: Potential Choke Point in Tape-based Data Restore

Backups

(Reads)

From

“Virtual

Volumes”

To

Tape

OK

Restores

(Writes)

From

Tape

To

“Virtual

Volumes”

Choked

By

“Virtualization”

software

Storage Servers

“Virtual Volumes”

“Virtualization”

Engine

Data

Storage

tape and virtualization
Tape and “Virtualization”
  • Old software RAID write penalty…again
  • 100+ hours to restore 1 TB of files to virtualized environment
  • Concordance of backup & restore software and “virtualization engine” (LUN aggregation software) must be tested and verified
get to spring training camp
Get to Spring Training Camp
  • DR landscape complicated by burgeoning data and new technologies “When you come to a fork in the road, take it.”*
  • Proactive strategies required “You can’t think and hit at the same time.”*
  • Need for frequent and thorough testing underscored “You can observe a lot by watching.”*

* Storage Recovery a la Yogi Berra

the game goes on
The Game goes on
  • True storage networks coming soon to a theater near you…
  • DataCore and FalconStor pioneering platform-agnostic data re-hosting…
  • Work on standards-based management continues..
    • De-facto (EMC)
    • Open (CIMOM)
tips for staying in the game
Tips for Staying in the Game
  • Make recoverability a key criterion/consideration when selecting components, designing applications, architecting infrastructure, etc.
  • Filter through the market hype by becoming knowledgeable about technology and its limitations
    • SearchStorage.com
    • Drplanning.org
  • Join and attend a DR user group: learn from peers

And remember Yogi Berra’s greatest line:

“Baseball (like storage recovery) is 90% mental. The other half is physical.”

next year s topic hockey greats discuss winning virtualization techniques @
Next Year’s Topic: Hockey Greats DiscussWinning Virtualization Techniques (?!#@)
slide29
For further information…

And look for

Disaster Recovery Planning 3/e

and

The Holy Grail of Networked Storage Management

Coming from Prentice Hall PTR in Summer 2002

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