• Introducing WebPros Cloud - a fully managed infrastructure platform purpose-built to simplify the deployment of WebPros products !  WebPros Cloud enables you to easily deliver WebPros solutions — without the complexity of managing the infrastructure.
    Join the pilot program today!
  • Support for BIND DNS has been removed from Plesk for Windows due to security and maintenance risks.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS.

Question VPS Disk Speed Using dd

WebHostingAce

Silver Pleskian
Hi,

I know dd command is might not be the best way to test hard disk speed.

I have this SSD VPS, When I do a restart it shows over 400 MB/s for couple of hours.

After couple of hours its goes down to under 200 MB/s.

I contacted the support but they ain't giving any direct answer than everything working fine.

Anyone know why its showing over 400 MB/s for couple of hours and then goes under 200 MB/s?

dd command I use,

# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

Thank you.
 
I would suggest you repeat you tests with Bonnie++ - disk and file system benchmarking tool for measuring I/O performance.
Just install it with

# yum install bonnie++

and then run with something like:

# bonnie++ -d /tmp -s 4G -n 0 -m TEST -f -b -u root

Most probably it will give you more relevant results.
Also note, that writing speeds tend to degrade on SSD because of wear-leveling by the SSD controller.
 
Back
Top