HHVM, MariaDB and Nginx Make WordPress fly (seriously). This site is running on what may the fastest possible software stack for WordPress. That stack is HHVM, MariaDB 10.1, Nginx and Ubuntu 14.04. As you are browsing this site you may notice that it is graphically intensive. It also leverages many CPU hungry plugins that would make it take 6-10 seconds to load on even good shared hosting. With this aforementioned software stack pages up to 5MB on this site still load in under a second, end-user pipe permitting.

Sometimes it is necessary to copy Ceph pool objects from one Ceph pool to another - such as when changing CRUSH/erasure rule sets on an expanding cluster. There is a built-in command in RADOS for doing this. However the command in question, rados cppool , has some limitations. It only seems to work with replicated target pools. Thus it cannot copy Ceph pool objects from a erasure pool to a replicated pool, or between erasure pools.