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VMware vSphere 4 User Manual

VMware vSphere 4
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VMware vSphere 4 Fault Tolerance:
Architecture and Performance
W H I T E P A P E R
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VMware vSphere 4 Specifications

General IconGeneral
BrandVMware
ModelvSphere 4
CategorySoftware
LanguageEnglish

Summary

VMware Fault Tolerance Architecture

Deterministic Record/Replay

Technology for capturing and replaying virtual machine execution by recording non-deterministic inputs for later injection.

Fault Tolerance Logging Traffic

Describes the high-level architecture of FT, where primary VM's external inputs are captured and sent to the secondary.

Transparent Failover

Ensures no data or state loss during failover by committing actions only after secondary acknowledgement.

Performance Aspects and Best Practice Recommendations

FT Operations: Turning On and Enabling

Explains the performance implications of turning FT on/off and enabling/disabling FT for virtual machines.

Secondary Virtual Machine Execution Speed

Discusses reasons why the secondary VM might run slower and how the hypervisor manages this.

Network Link

Highlights the importance of network link speed and latency for FT performance.

Fault Tolerance Performance

Oracle 11g

Analyzes FT's impact on Oracle 11g database performance using the Swingbench workload.

Microsoft SQL Server 2005

Evaluates FT performance on Microsoft SQL Server 2005 using the DVD Store benchmark.

Microsoft Exchange Server 2007

Measures FT's impact on Microsoft Exchange Server 2007 latency using the Loadgen workload.

VMware Fault Tolerance Performance Summary

Conclusion

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