On 9/30/2015 3:12 AM, Bernd Fehling wrote: > while setting up some new servers (virtual machines) using XEN I was > thinking about an alternative like KVM. My last tests with KVM is > a while ago and XEN performed much better in the area of I/O and > CPU usage. > This lead me to the idea to start a poll about virtualization platform and > your experiences.
I once had a virtualized Solr install with Xen where each VM housed one Solr instance with one core. The index was distributed, so it required several VMs for one copy of the index. I eliminated the virtualization, used the same hardware as bare metal with Linux, still one Solr instance installed on the machine, but with multiple Solr cores. Performance is much better now. General advice: Don't run virtual machines. If a virtual environment is the only significant hardware you have access to and it's used for more than Solr, then you might need to. If you do run virtual, then minimize the number of VMs, don't put multiple replicas of the same index data on the same physical VM host, give each Solr VM lots of memory, and don't oversubscribe the memory/cpu on the physical VM host. Thanks, Shawn
