Cisco Cisco UCS C250 M1 Extended-Memory Rack-Mount Server Libro blanco
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Sequential read I/O also demonstrates that the bandwidth scales linearly with additional nodes with acceptable response times
(less than 20 milliseconds). In a six-node setup, a peak bandwidth of 605 MBps was reached without exceeding acceptable
response times (Figure 64).
(less than 20 milliseconds). In a six-node setup, a peak bandwidth of 605 MBps was reached without exceeding acceptable
response times (Figure 64).
Figure 64. 256-KB Sequential I/O on One Virtual Machine per Blade: 100 Percent Read
Sequential write I/O also demonstrates that the bandwidth scales linearly with additional nodes with acceptable response times.
Sequential write bandwidth reached 190 MBps (Figure 65).
Sequential write bandwidth reached 190 MBps (Figure 65).
Figure 65. 256-KB Sequential I/O on One Virtual Machine per Blade: 100 Percent Write
The response time variations (the fourth and fifth nodes have longer response times than the sixth node) are the result of the
inherent random access levels at the disk, although write operations are sent sequentially at the application level, so caution must
be exercised when running 100 percent sequential write workloads.
inherent random access levels at the disk, although write operations are sent sequentially at the application level, so caution must
be exercised when running 100 percent sequential write workloads.