VMware vSphere Fault Tolerance 4 - Manual (Page 10)

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Figure 7. Netperf Latency Comparison
0
100
200
300
500
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600
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800
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FT Disabled
FT Enabled
Netperf - latency sensitive case
Mbits/sec
Receives Transmits
FT traffic
Rx: 500 Mbits/sec
Tx: 36 Mbits/sec
3.5. Filebench random Disk read/write
Filebench is a benchmark designed to simulate different I/O workload profiles. In this experiment, filebench was used to generate
random I/Os using 200 worker threads. This workload saturates available disk bandwidth for the given block size. Enabling FT did not
impact throughput; however, at large block sizes, disk read operations consumed significant networking bandwidth on the
FT logging NIC.
Figure 8. Filebench Performance
0
1000
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3000
5000
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6000
7000
8000
9000
FT Disabled
FT Enabled
Filebench
IOPS
2KB read 64KB read 2KB write 64KB write 2KB read/write
FT traffic
2K read: 155 Mbits/sec
2K write: 3.6 Mbits/sec
64K read: 1400 Mbits/sec
64K write: 1.96 Mbits/sec
2K read/write: 34 Mbits/sec