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 … Read more

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 … Read more

Sample Cloud Server Benchmark

Customers frequently ask us to run the bench.sh 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:~$ ./bench.sh Benchmark started on Mon Nov 14 13:16:33 UTC 2016 … Read more