run
dd if=/dev/zero of=/root/testfile bs=1G count=1 oflag=direct
you will get result like this
SSD dedicated server speed from https://royalclouds.net
to test Disk Speed in UBUNTU
run this commond
dd
if
=
/dev/zero
of=
test
bs=64k count=16k conv=fdatasync
SSD KVM VPS from https://royalclouds.net