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Storage latency performance benchmarks

Testing Methodology

The disk I/O latency is measured in a VM running Linux or Windows. The disk I/O latency measured in the VM indicates the disk I/O latency that could be happened to the workloads running in the same VM. The I/O operations in UNIX and Linux systems typically go through the file system cache. With direct I/O enabled the operations against raw devices automatically bypass the file system cache.

Testing Tool


Supported OS: Linux

The ioping is a simple disk I/O latency measuring tool.

Test Setup

ioping - Ubuntu 18.04

  • Prepare the VM to have proper irqbalance setting on Linux. (A script is available here).
  • Download the ioping tool.
sudo apt-get update -y
sudo apt-get install -y ioping
  • Run the ioping measurement with the parameters specifying the interval, request size, direct I/O enabled and read/write action.
sudo ioping -c 10000 -s 4k -i 0 -q -D /dev/xvdb
sudo ioping -c 10000 -s 4k -i 0 -q -D -WWW /dev/xvdb

The same ioping parameters are used when comparing a VM running on different environment. Make sure to change the configuration file to access the correct block device name that you wish to test, e.g. /dev/sda or /dev/xvda.


ioping - latency from different operating systems on Sunlight

Platform OS Number of cores Memory size (GB) Disk size (GB) Physical NVMe drive Latency - Read (us) Latency - Write (us)
Sunlight on premise (Intel BP) Ubuntu 18.04 16 64 80 Intel P4610 1.6TB 47.3 79.6