Good to know hypomania2.
Was also curious about the ye old dd test on my servers...but one test would not yield accurate results since there are many VMs in use so I ran it multiple times and on different versions.
Ubuntu Server 16.04.4 LTS on VMware ESXi (SAS RAID5) (shared by many VMs)
Command:
Code:
dd if=/dev/zero of=/bak/test bs=1M count=3240 oflag=direct
Results after multiple runs:
Code:
3397386240 bytes (3.4 GB, 3.2 GiB) copied, 17.7719 s, 191 MB/s
3397386240 bytes (3.4 GB, 3.2 GiB) copied, 14.3560 s, 237 MB/s
3397386240 bytes (3.4 GB, 3.2 GiB) copied, 18.6472 s, 182 MB/s
3397386240 bytes (3.4 GB, 3.2 GiB) copied, 17.3100 s, 196 MB/s
Ubuntu Server 18.04 LTS on VMware ESXi (SAS RAID5) (shared by many VMs)
Command:
Code:
dd if=/dev/zero of=/bak/test bs=1M count=2240 oflag=direct
Results after multiple runs:
Code:
2348810240 bytes (2.3 GB, 2.2 GiB) copied, 18.4878 s, 127 MB/s
2348810240 bytes (2.3 GB, 2.2 GiB) copied, 11.4518 s, 205 MB/s
2348810240 bytes (2.3 GB, 2.2 GiB) copied, 9.59828 s, 245 MB/s
2348810240 bytes (2.3 GB, 2.2 GiB) copied, 9.40841 s, 250 MB/s
Ubuntu Server 18.04 LTS on a Win10 PC via VirtualBox (SATA) (No other VMs running which means more consistent results)
Command:
Code:
dd if=/dev/zero of=/bak/test bs=1M count=2000 oflag=direct
Results after multiple runs:
Code:
2097152000 bytes (2.1 GB, 2.0 GiB) copied, 31.7891 s, 66.0 MB/s
2097152000 bytes (2.1 GB, 2.0 GiB) copied, 31.9287 s, 65.7 MB/s
2097152000 bytes (2.1 GB, 2.0 GiB) copied, 28.8840 s, 72.6 MB/s
2097152000 bytes (2.1 GB, 2.0 GiB) copied, 28.4221 s, 73.8 MB/s
LHammonds
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