Okeanos – GRNET’s cloud service, for the Greek Research and Academic Community

GRNET has developed its own IaaS cloud solution which is providing virtualized computing resources for free to the Greek Universities and public Research Centres that already utilize GRNET’s network infrastructure and services. The cloud service called ~okeanos is operated using an in-house developed software stack called Synnefo. The software builds on top of existing proven open source software (e.g. Google Ganeti), enhanced and expanded in order to provide a robust and complete IaaS cloud solution. ~okeanos is currently used on daily basis by thousands of users, university students, researches and members of the academia.

GRNET operates ~okeanos via the company-owned data center which currently comprises 22 racks, 400+ servers and 4 Petabytes of storage. The servers were ~okeanos is hosted have the following characteristics:

  • CPU: dual AMD Opteron 6172, 2100MHz, 12cores
  • Memory: 192GB (24x8GB)
  • Disk: 8x600GB SAS
  • Network: 4x1G + IPMI (iLO)
  • Size: 2RU

This infrastructure is currently being extended with additional hardware and different architectural configurations (SSDs, GPUs etc), in order to satisfy the increasing and diversifying demand for computing resources. Technical details are given in the table below.

Administrative data

System Name Okeanos
Short Description GRNET’s cloud service, for the Greek Research and Academic Community
Owner GRNET S.A.
Country Greece


Dedication to VI-SEEM

Dedication % of max VMs 2%
Dedication storage % 2%
Dedication in VM hours 1,752,000
Dedication storage in TB 100


Cloud system operational since 2010
Expected date system to be available to the project PM01
Expected date to be phased -
Interface to be provided Okeanos


Computational Power

Number of servers 400 Server specification HP DL385G7 CPU per server 2
RAM per server 192 Total number of CPU cores 5520 Max number of VMs 10,000
Smallest VM CPU cores 1 Smallest VM RAM 1 Largest VM CPU cores 8
Largest VM RAM 8 Total storage 300 TB Cloud environment type synnefo.org
Interfaces Standart Openstack User access Academic Login, Classic Accounts (API Based, Web UI)