<diagram goes here>

General purpose computing cluster (three nodes).

  • Hardware: all machines are based on IBM x3750M4 and each has:
    • 4 sockets with 8-core CPU-s (Intel Xeon E5-4640), 32 cores per node.

    • 128GB of RAM (16 x 8GB), upradable to 1.5TB per node.

    • 4x Gigabit 10/100/1000 interfaces.

    • 2x 10Gbit SFP+ interfaces.

      • Redundant connections to two 10GbE switches.
      • VLAN-s for iSCSI, internal network and Internet connectivity
    • Integrated Lights out Managemnt (fully featured).

    • 6 free PCIe 3.0 x8 expansion slots (3 high-profile and 3 low-profile).

    • Next Business Day warranty coverage.

    • Integrated RAID controller ServeRAID M5110e SAS/SATA.

      • Only used for virtualization host OS installation with two SAS drives in RAID1 configuration.

    • 2 redundant high-efficiency power supply units and redundant cooling fans.

  • Software: all machines are running CentOS 6 and provide KVM virtualization


SAN (Storage Area Network) system - IBM Storwize V3700.

  • Fully redundant system with 48 3TB 7.2k SAS disk drives providing 125TB of RAID6 protected storage to the computing cluster.
  • Multipath iSCSI connectivity to all computing nodes (no single point of failure).


Backup servers (3 in total).

  • Two identical servers in Tartu, Estonia. In two separate University of Tartu datacenters.
  • Hardware
    • 2 sockets with 6-core CPU-s (Intel Xeon E5-2609v3).
    • 64GB of RAM,  4x 16GB DDR4 RDIMM.
    • 2x GbE interfaces
    • 2x 10GbE SFP+ interfaces
      • End-to-end redundant 10GbE connectivity to the compute cluster.
    • RAID controller Supermicro AOC-S3108L-H8IR-O-P
    • Redundant power supply

    • 2x 120GB SATA3 SSD for system and cache.

    • 48 4TB SAS3 7,2k RPM hot-swap disk drives.

  • Third similar server (24 8TB disks) in Tallinn, Estonia for geographic diversity (not in production yet)
  • All servers use different RAID technologies and software versions to avoid a theoretical simultaneous software failure on all three machines.


Network switches.

  • Two IBM RackSwitch G8124-R switches with 24 10GbE SFP+ slots each.
  • Lights out Management network is provided separately over University of Tartu network.

Virtual machines.

  • Main web server for sites with PHP and static content
  • Second web server for Python / Plone based sites
  • Central database server (PostgreSQL and MySQL)
  • Metashare production server (
  • Metashare testserver
  • Docker host
  • GDEF (Grand dictionnaire estonien-français -
  • GitLab code repository
  • SSO Service Provider service
  • Corpus search
  • Corpus computation/transformation (question)
  • Speech recognition server
  • Server for Computational Linguistics student homework
  • (question) "Avatud keeletehnoloogia pilvetaristu struktureerimata avaandmete väärindamiseks" test- and development machines.
  • "Applying Spatial Data in Linguistics" - test- and development server and public webserver (
  • (question) Estonian Wordnet test- and development server
  • Internal services, environments for student assignments, development environments, etc.
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