Disaster Recovery Research PowerPoint
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Transcript Disaster Recovery Research PowerPoint
Connie Murphy
Disaster Recovery - Techniques and Topologies
February 26, 2004
Abstract
Resiliency/ Backup Services
Introduction
NAS/SAN Topologies
RAID Systems
Backup Software
Disk Striping
Vendor Support Services
Performance Indicators
Conclusion
Introduction
Disaster Recovery is the
coordinated process of
restoring systems, data,
and infrastructure
required to support key
ongoing business
operations.
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Introduction (continued)
Previous
•
Systems includes both hardware and
software
•
Data includes true data, log files, and
audit information, as well as business
procedures and rules
•
Infrastructure includes phones, office
space, remote access, intranets, web
space, firewalls, etc.
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Business operations are whatever things
the business does on a daily basis to
generate revenue
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Hardware-based Raid
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Hardware arrays also do not
occupy any host system memory,
nor are they operating system
dependent.
Hardware arrays are also highly
fault tolerant.
Provide true hardware multitasking .
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Software-based Raid
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software arrays often fail to
boot if the boot drive in the
array fails
Some software-based
implementations require a
separate boot drive
RAID arrays may be created
without swapping out hardware
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Raid Fault Tolerance
OR
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All RAID systems should be
supplemented with some other form
of protection against failures,
RAID is the first step toward DRP
RAID arrays offer flexibility and
protect against hardware failure.
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Disk Striping
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Technique by which data spans
multiple hard drives
All hard drives involved in the
stripe set are simultaneously
read or written to
Several levels of RAID use disk
striping for fault protection
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Performance Indicators
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Provide the means by
which one can measure the
success of a DRP
Are a blend of project
status and test runs of
infrastructure
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Performance Indicators
Measurements for success:
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Intervallic reports from the planning
group to senior management.
Representation of the network design
team on the DRP team.
Intervallic tests authenticate
performance of the disaster recovery
plan, including noticed gaps and risks.
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Performance Indicators (cont.)
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An evaluation process that
includes deploying new solutions.
Final analysis of the disaster
recovery testing, and effect on
the business (after a disaster
occurs) (Cisco White Paper, 1).
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Pre-planning Management Awareness
Identify Possible Disaster Scenarios
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How much of the organization's
resources could be lost?
What are the total costs?
What efforts are required to rebuild?
How long will it take to recover?
What is the impact on the overall
organization?
How will customers be affected?
What is the impact on them?
How much will it affect the share price
and market confidence?
Pre-planning Management Awareness
(cont.)
Build Management Awareness
Obtain Management Sign-Off
and Funding
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Disaster Recovery Planning Process
Establish a planning group to
manage the development
2. Perform risk assessments and
audits
3. Establish priorities for
network and applications
- Mission critical
- Important
- Minor
1.
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Disaster Recovery Planning Process
4.
5.
6.
7.
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Develop recovery strategies
Prepare an up-to-date
inventory and documentation
of the plan
Develop verification criteria
and procedures
Implement the plan
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Resiliency and Backup Services
Assess the resiliency of your
network
1. Network links
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Carrier diversity
Local loop diversity
Facilities resiliency
Building wiring resiliency
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Power, security and disaster
Redundant hardware
Mean time before replacement (MTTR)
Network path availability
2. Hardware resiliency
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Resiliency and Backup Services
3. Network design
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Layer 2 WAN design
Layer 2 LAN design
Layer 3 IP design
4. Network services resiliency
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DNS resiliency
DHCP resiliency
Other services resiliency
Review and Implement Backup
Services
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High-speed local backup
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Filer-to-tape Backup an NAS appliance
(also called a filer) directly
to a SCSI-attached or Fibre
Channel-attached tape drive
or robotic tape library
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High-speed backup (filer-to-tape)
N
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Three-way backup
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Y
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Filer-to-filer Backup a secondary NAS
appliance through the LAN
to a tape device or library
that is attached to a
separate, primary NAS
appliance
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Three-way backup (filer-to-filer)
N
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Y
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Filer-to-server backup
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Y
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Filer-to-server Backup an NAS appliance
through the LAN to a tape
device or library connected
to a server
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Filer-to-server backup
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Y
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Server-to-filer backup
N
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Y
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Server to filerBackup data on a
server through the
LAN to a tape device
or library that is
SCSI-attached or
Fibre Channel-attached
to a NAS appliance
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Server-to-filer Backup
N
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Y
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Backup through multi-hosting
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Servers and NAS appliances
in any combination are
directly connected by SCSI
or Fibre Channel to one or
more drives in a single or
multi-drive tape library
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Backup through multi-hosting
N
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Y
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Backup through Fibre Channel SAN
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Y
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Servers and NAS appliances
in any combination are
connected to one or more
tape libraries through a
Fibre Channel switch.
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Backup through Fibre Channel SAN
N
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Y
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Backup through iSCSI
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SCSI over IP –
Using iSCSI technology,
remote IP-attached
storage devices are seen
by a host computer as if
they are local devices
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Vendor Support Services
Key questions regarding vendor
support include:
– Are support contracts in place?
– Has the disaster recovery plan
been reviewed by the vendors,
and are the vendors included in
the escalation processes?
– Does the vendor have sufficient
resources to support the disaster
recovery?
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Completing the DRP
Decisions must be made about
“gray area” files (Corporate
standards, executive privileges,
and other factors create these
files)
– Backup or replicate?
– Save or ignore?
– Vital or non-vital?
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Conclusion
Understand the purpose of the DRP
Define specific requirements
Determine success criteria
Develop a plan to ensure that
success
The DRP can be a challenging and
expensive undertaking, but one that
will be well worth the effort as it
could determine the future of the
company in the event of a disaster.
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References
Previous
Seven Effective Strategies for Data Protection: A
Practical Guide to NAS and SAN Deployment.
White Paper from Syncsort 2002. Retrieved
February 15, 2004, from the World Wide Web.
http://www.syncsort.com
Disaster Recovery: Best Practices White Paper.
Cisco Systems updated Jan 27, 2004. Retrieved
February 18, 2004 from the World Wide Web.
http://www.cisco.com/warp/public/63/disrec.html#
topic16
“Raid defined.” ND. Retrieved February 16,
2004 from the World Wide Web.
http://searchstorage.techtarget.com/sDefinition/0
%2C%2Csid5_gci214332%2C00.html
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References
Previous
“Enterprise Data Protection Bill of Rights.”
Quantum Corporation, 2003. Retrieved March 1,
2004, from the World Wide Web.
http://quantum.treehousei.com/Surveys/publishing
/survey_148/graphics3/prod_pgs/whitepaper.pdf
Nueffer. “What is Raid?” Retrieved March 1,
2004, from the World Wide Web.
http://www.unimainz.de/~neuffer/scsi/what_is_raid.html
http://www.netapp.com/tech_library/ftp/3066.pd
f
Wold, Goeffrey, Robert Shriver. (2001)
Disaster Proof Your Business. New York:
McGraw-Hill Primis Custom Publishing.
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Software Resources
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Legato
http://www.hastorage.com/Backup
Software_Legato.htm
NetWorker
http://www.hastorage.com/Backup
Software_Legato_Networker.htm
Backup Express
http://www.hastorage.com/Backup
Software_SyncSort.htm
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Software Resources
Previous
Backup Report
http://www.hastorage.com/BackupSoft
ware_Bocada.htm
Veritas
http://www.veritas.com/Products/www
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Software Resources
Previous
Dantz
http://www.hastorage.com/BackupSo
ftware_Dantz.htm
Retrospect
http://www.hastorage.com/BackupSo
ftware_Dantz.htm
Bocada
http://www.hastorage.com/BackupSo
ftware_Bocada.htm
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