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Exchange Disaster Recovery with SANRAD V-Switch Planning Guide
Introduction
Debt Management Designing a disaster recovery system requires planning and
consideration of the
available options that will best fit your company's needs, SLA and
budget.
This guide will help you design an
Exchange Disaster Recovery plan in
conjunction with
SANRAD Replication. The guide assumes that you have basic knowledge
of SANRAD V-Switch and Exchange
Administration.
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Debt Relief Solution Note: It is recommended to read Microsoft's Exchange
Server 2003 Disaster
Recovery Planning Guide available from
http://www.microsoft.com/downloads/details.aspx?FamilyId=784BBE
A2-28DD-409A-8368-F9914E993B28&displaylang=en.
Exchange Disaster Recovery Planning
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Debt Management Services This section discusses both general and Exchange specific
considerations that need to
be addressed when designing a disaster recovery solution combining
SANRAD
replication and Microsoft Exchange Server.
General Considerations
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Bad Credit Debt Consolidation SANRAD replication solution allows for flexibility with Exchange Disaster Recovery design.
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Credit Debt Solution The most influential factors affecting design consideration are:
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Consolidation Counseling . Budget limitations
Credit Card Debt . Recovery Time Objective (RTO) requirements (the time until the data is back online)
Debt Free Solution . Recovery Point Objective (RPO) requirements (the amount of data that can be lost)
Debt Negotiation Services . Network bandwidth between the local site and remote site
Debt Solution Company . Replication method: Synchronous versus Asynchronous
Debt Elimination Services . Replication frequency (only for Asynchronous replication)
Debt Reduction . Initial volume synchronization
Debt Solution Inc RTO (Recovery Time Objective)
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. With high level RTO, duplicate hardware is required to allow
quick recovery making
the solution more costly.
Debt Relief RPO (Recovery Point Objective)
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RPO requirements are best defined by the amount of data that the
company is willing to
lose.
Counseling Credit Debt . High level RPO requires more bandwidth for both Synchronous
and Asynchronous
replication.
Debt Consolidation Program . Low level RPO requires less frequent replication and increases
the risk of losing
more data.
Debt Reduction Solution Credit Network Bandwidth between the Local and Remote sites
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Bandwidth between the sites is generally the most crucial factor
affecting the replication
component of a Disaster Recovery solution.
Credit Card Debt Solution . T1 (1.5Mb) links impose less frequent data replication and the
use of asynchronous
replication methods.
Card Counseling Credit Debt . T3 (45Mb) links or a 1Gb links allow frequent replication and
the flexibility to choose
between synchronous replication or asynchronous replication
methods.
Debt Help Replication method
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When considering which replication method to choose it is important
to remember:
Christian Consolidation Debt . In Synchronous Replication the I/O commands are written
to the local disk and to
the remote volume at the same time. Every IO command requires
an
acknowledgment from both the local and remote sites before the next
command.
Consequently, synchronous replication is best deployed with a high
bandwidth
connection in order to allow the remote acknowledgment to arrive
back to the local
site as fast as possible and the replication can run faster.
Debt Counseling . In Asynchronous Replication the I/O commands are
written to the local volume and
local journal volume which in turn is replicated periodically to
the remote volume as
periodically defined by the user. Consequently asynchronous
replication can work
well with lower bandwidth (minimum recommended for Exchange
replication is 1.5
Mb) since both acknowledgements are local (from the primary volume
and the journal
volume) and thus the replication is fast by default.
Debt Settlement Solution . For Asynchronous replication, you must decide the data
replication frequency. There
are three factors that must be considered:
Consolidation Debt Free Iowa 1. The size of the network bandwidth between the sites.
Consumer Debt Consolidation 2. The amount of data changes that need to replicate each
time.
For example, large amounts of data changes take longer to replicate
using T1
links.
Consumer Debt Solution 3. The RPO requirements.
Debt Reduction Services Initial Volume Synchronization
Debt Settlement
SANRAD replication solution can be used to protect existing
production Exchange data.
SANRAD Disaster Recovery solution supports both online and offline
synchronization.
When using SANRAD replication with existing Exchange data, an
Initial synchronization
of the Exchange volumes on the local site to the remote site must
be performed.
The initial volume sync method depends on:
American Debt Solution . The size of the volumes needed to be synchronized.
Credit Debt Counseling . The network bandwidth between the sites. For example, the
bigger the volume size,
the longer it will take to synchronize over a T1 link.
Student Loan Debt Online synchronization starts immediately when
replication is started and uses the
same network link that will be used during the replication.
Green Path Debt Solution Offline synchronization is a manual process where SANRAD
replication prepares the
volumes on the primary site and the user must copy the data to the
remote site. It is the
user's responsibility to make sure the volumes on the remote site
are synchronized.
Exchange Considerations
Any Exchange Disaster Recovery planning should (at the very least) consider the following
requirements:
Debt Free . Quick access to the most recent copy of the Exchange database
and the transaction
logs. In a disaster situation SANRAD replication provides fast
access to the
replicated data on the remote site.
Nonprofit Debt Solution . The Exchange database and its related transaction logs must be
replicated together
to the remote site. SANRAD replication uses consistency groups to
ensure
simultaneous replication of all volumes assigned to a consistency
group.
Debt Service Non Profit . Exchange is integrated into Active Directory. An Active
Directory domain controller
(running Global Catalog) which is part of the same Active Directory
domain that
exists in the primary site, must exist in the remote site as well
(or at least the
capability to rebuild one and reconnect it to the existing Active
Directory Domain).
Debt Consolidation Services . The most up to date replicated copy of the Windows backup set
(which includes
system state) to expedite Exchange Server recovery.
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Note: for detailed information about Exchange 2003 disaster
recovery considerations
please read Microsoft's article, "Exchange Server 2003 Disaster
Recovery Planning
Guide (http://go.microsoft.com/fwlink/?LinkId=21277)".
Federal Debt Consolidation This guide deals with designing a disaster recovery system while
planning and considering the
available options. It further discusses about suggested Disaster
Recovery Designs, fully Mirrored Remote Site, partially Mirrored
Remote Site,
small Remote Site, combining SANRAD Disaster Recovery Designs with
Exchange Disaster,
restore Models, restore Exchange with a Standby Server and restore
by Rebuilding Exchange Server.
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