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Microsoft SQL 2000 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.
With SANRAD DR Solution there is no need to use Log shipping (which requires extra recovery steps) or Microsoft SQL's built in replication mechanism (which requires the configuration of a publisher and a subscriber). SANRAD DR makes the data and transaction log available to the SQL server on the remote site for immediate use. Even if there is no SQL server on the remote site, once built after a disaster, it will be able to access the data immediately with minimum recover time. SANRAD DR solution is a "hot standby solution" when there is a server on the remote site and a "warm standby solution" when there is no SQL server on the remote site (which will be built after a disaster).
This guide will help you design Disaster Recovery plan for Microsoft SQL 2000 in conjunction with .
The guide assumes that you have basic knowledge of SANRAD V-Switch and MSSQL 2000 Administration.
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Disaster Recovery Planning For Microsoft SQL 2000
This section discusses both general and MSSQL specific considerations that need to be addressed when designing a disaster recovery solution combining and Microsoft SQL 2000.
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Debt Management Services General Considerations
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solution allows for flexibility with Microsoft SQL 2000 disaster recovery design.
The most influential factors affecting design consideration are:
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Consolidation Counseling . Recovery Time Objective (RTO) requirements (the time until the data is back online)
Credit Card Debt . Recovery Point Objective (RPO) requirements (the amount of data that can be lost)
Debt Free Solution . Network bandwidth between the local site and remote site
Debt Negotiation Services . Replication method: Synchronous versus Asynchronous
Debt Solution Company . Replication frequency (only for Asynchronous replication)
Debt Elimination Services . Initial volume synchronization
Debt Reduction RTO (Recovery Time Objective)
Debt Solution Inc . With high level RTO, duplicate hardware is required to allow quick recovery making the solution more costly.
Debt Settlement Services RPO (Recovery Point Objective)
Debt Relief RPO requirements are best defined by the amount of data that the company is willing to lose.
Christian Debt Solution . High level RPO requires more bandwidth for both Synchronous and Asynchronous replication.
Counseling Credit Debt . Low level RPO requires less frequent replication and smaller bandwidth.
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Network Bandwidth between the Local and Remote sites
Debt Reduction Solution Credit Bandwidth between the sites is generally the most crucial factor affecting the replication component of a solution.
Debt Collection Services . T1 (1.5Mb) links impose less frequent data replication and the use of asynchronous replication methods.
Credit Card Debt Solution . T3 (45Mb) links or a 1Gb links allow frequent replication and the flexibility to choose between synchronous replication or asynchronous replication methods.
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Replication method
Debt Help When considering which replication method to choose it is important to remember:
Com Debt Solution . 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.
Christian Consolidation Debt . 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 Microsoft SQL 2000 replication is 1.5 Mb).
Debt Counseling . For Asynchronous replication, you must decide the data replication frequency. There are three factors that must be considered:
Debt Settlement Solution 1. The size of the network bandwidth between the sites.
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Consumer Debt Solution Initial Volume Synchronization
solution can be used to protect existing production Microsoft SQL 2000 data. solution supports both online and offline synchronization. When using with existing Microsoft SQL 2000 data, an Initial synchronization of the Microsoft SQL 2000 volumes on the local site to the remote site must be performed.
The initial volume sync method depends on:
Debt Reduction Services . The size of the volumes needed to be synchronized.
Debt Settlement . The network bandwidth between the sites. For example, the bigger the volume size, the longer it will take to synchronize over a T1 link.
American Debt Solution Online synchronization starts immediately when replication is started and uses the same network link that will be used during the replication.
Credit Debt Counseling Offline synchronization is a manual process where 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.
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Microsoft SQL 2000 Considerations
Green Path Debt Solution Any Microsoft SQL 2000 Disaster Recovery planning should (at the very least) consider the following requirements:
Consolidation Debt Debt Free . Quick access to the most recent copy of the Microsoft SQL 2000 database and the transaction logs. In a disaster situation provides fast access to the most recent replicated data on the remote site.
Debt Free . The Microsoft SQL 2000 database and its related transaction logs must be replicated together to the remote site. uses consistency groups to ensure simultaneous replication of all volumes assigned to a consistency group.
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This article 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 Microsoft SQL 2000 Disaster Restore Models, restore Microsoft SQL 2000 with a Standby Server
and restore by Rebuilding Microsoft SQL 2000 Server.
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