## 4 Results
### Infrastructure  
AZON platform uses multimedia infrastructure offered by the Wroclaw University of Science and Technology, Wroclaw Centre for Networking and Supercomputing (which is a base for local services implementation). It runs on-premise services along with services offered by an external cloud. It can offer a presentation layer built on the OTT (over-the-top) platform features, enabling media content delivery to users equipped with any device running a compatible Internet browser. In Figure 1 the used infrastructure is outlined. The meaning of the depicted blocks is as follows:  
* _virtual servers_--a virtual servers farm managed by VMware virtualizer;
* _ffmpeg_--web service deployed on one of the virtual servers, used mainly for video transcoding, build on the base of ffmpeg tool;
* _image server_--web service deployed on one of the virtual servers, used for user-friendly multimedia presentation, build on iipsrv (IIPImage--High Resolution Streaming Image Server);
* _disk array_--a system built from multiple disk drives and a cache memory offering storage capacity for numerous hosts;_tape library_--a high-capacity storage system, also called a tape robot, preserving data on many tape cartridges;
* _Lustre file system_--an efficient file system, optimized for access (write, read) to temporary data generated during calculations on the cluster, with a dedicated communication network--Infiniband;
* _BEM cluster_--a supercomputer, with 22 thousand computing cores and a total output of 860 TFLOPS. The cluster has 720 24-core computing nodes (Intel Xeon E5-2670 v3 2.3 GHz, Haswell) and 192 28-core computing nodes (Intel Xeon E5-2697 v3 2.6 GHz, Haswell). It has 74.6 TB of RAM (64, 128, or 512 GB per node). The exchange of data files between BEM and its clients takes place through the enabled disk shares. * _OZONE_--an on-premises platform for multimedia processing (deployed in the existing infrastructure);
* _Limerraft_--a cloud-based platform for multimedia processing (deployed in the external infrastructure). The blocks with a white fill represent managed parts of the infrastructure. The greyed and darkened blocks represent unmanaged parts of the infrastructure serving as bases for external services deployment. Such external services work, respectively, on-premise or on an external cloud. Some of the blocks have dashed contours (_ffmpeg, image server_). Such blocks are not really infrastructure's parts but represent services deployed on virtual servers. The _virtual servers_ farm, annotated with an icon representing \"virtual web servers\", acts as an accessible infrastructure. Such a solution enables the migration of virtual machines from the original environment to other locations (to different physical devices or blade shelves) ensuring redundancy. The monitoring of _virtual servers_ farm performs at the following levels: power supply and air-conditioning in the server room, status and parameters of the blade shelves, status and parameters of individual blade servers, status and parameters of the operating system of the virtual machine host, status and parameters of the operating system inside the virtual machines (in particular the status and parameters of AZON platform services). _Disk array_ serves mainly as a data storage system. Its shares are made available through various protocols on the cluster and, through the virtualizer, to virtual machines performing multiple AZON platforms' functions. In this way, the number of copies can be minimized, and the data transfer over the network can be limited. From there, archiving takes place, following established policy, using a dedicated FibreChannel (FC) network. Figure 1: An outline of the infrastructure on which the AZON platform has been deployed. The Wroclaw University of Science and Technology, Wroclaw Centre for Networking and Supercomputing maintains the core infrastructure characterized by calculation power: 860 TFlops, operating memory: 74.75 TB, disk space: 2.7 PB, tape memory: 5.6 PB. AZON platform uses part of it.