As you can see, VirtualBox satisfies the greater number of IOPS for the three low sized benchmark, while it is only slight behind the leader (VMware) on the 1024 KB sized test.Īt last, we want to see the disks total access time (seek time + read latency) This time, we are not measuring performances on KB/s, but on IOPS (I/O operations per second) terms. Another point of view for the same that is the following: However we can isolate the virtualizer speed, and we can see that Xen and KVM are considerably slower that Vmware, which in turn is slight slower that VirtualBox across the board. This is the main reason while flash-based SSD are so fast ) Let see the results (please keep in mind that the HDTune benchmarks are read only tests):Ĭan you ever see the 512 byte and 4 KB results? This graph is typical for a server equipped with mechanical disks: the lowest-sized benchmarks are dominated by seek time (which is a constant time, not related to chunk size).
Generally, the low-sized fragment benchmarks are access-time bound, while the 1024 KB sized benchmark is peak bandwidth bound.
The second test is HD Tune Benchmark Pro, which let us examine the bandwidth and access time of the primary disk reading 512 byte, 4 KB, 64 KB and 1024 KB sized chunks.
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