This category contains all posts that are general and not assigned to a more specific category or topic.

  • Eric Jones SPAM from

    We are receiving daily SPAM from Eric Jones (probably a fake name) from and if you are reading this, probably you are, too. If you haven’t done it yet, please report this abuse by contacting the abuse department of their domain registrar, Cloudflare: Email: Phone: +1.4153197517 That being said, it seems this SPAM-operation […]

  • Which (Software-)RAID for NVMe/SSD disks?

    Today we ran some tests and benchmarks and while in the past with mechanical hard drives the hit from the overhead of running checksums etc for RAID5 and/or RAID6 was negligible, with SSD it became a factor and with the latest generation Optane disks the difference is just huge. Compare the following numbers taken on […]

  • CloudStack MySQLIntegrityConstraintViolationException: Duplicate entry

    We have been seeing many variants of the MySQLIntegrityConstraintViolationException error message in CloudStack (CloudStack Duplicate entry). This can occur when creating or starting a VM or when deleting it, during account setup and during the startup of the management server. The causes can vary, from errors caused by MySQL STRICT_MODE changes to real duplicate entries […]

  • Sample Cloud Server Benchmark

    Customers frequently ask us to run the script to see the basic performance of our cloud instances. Well, here is the benchmark of a single cloud server with 1GB of RAM, 1 CPU Core and 10GB of Storage (SSD; connected using InfiniBand):   ubuntu@benchmark1:~$ ./ Benchmark started on Mon Nov 14 13:16:33 UTC 2016 […]