Ceph deep scrubbing and I/O saturation

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.

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Fix OpenStack / RDO / Havanna network

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 …

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