Ceph is a distributed storage system use in Cloud environment. Recently I’ve been facing an I/O congestion during night period.
This I/O saturation is impacting the application performance on OpenStack even if the system was really resilient to this activity level.
In this post I’ll explain why I had a such situation on the CEPH infrastructure and what are the settings to modify this I/O level.
After installing openstack on CentOS with RDO package (installation I recommand as it is really easy) I had some issue with network : the bridges were not connected to the physical network and well configured so I was not able to communicate with any VM created.
Here is how I solved this issue …
Following the excellent OpenStack tutorial for OpenSuse you can find here I made some modification to make it works …