Breniac hardware
================

Breniac is the VSC's Tier-1 cluster hosted by KU Leuven.

.. include:: breniac_login_nodes.rst


Hardware details
----------------

- 408 skylake nodes

   - 2 Xeon Gold 6132 CPU\@2.6GHz, 14 cores each
   - 192 GB RAM (:ref:`memory bandwith and latency measurements <memory bandwidth and latency skylake tier1>`)
   - 75 GB SSD local disk
   - specific ``qsub`` :ref:`options <submit to Breniac skylake node>` apply

- 436 broadwell nodes

   - 2 Xeon E5-2680v4 CPUs\@2.4GHz, 14 cores each
   - 128 GB RAM (:ref:`memory bandwith and latency measurements <memory bandwidth and latency broadwell tier1>`)
   - 75 GB SSD local disk
   - specific ``qsub`` :ref:`options <submit to Breniac broadwell node>` apply

- 144 broadwell nodes

   - 2 Xeon E5-2680v4 CPUs\@2.4GHz, 14 cores each
   - 256 GB RAM
   - 75 GB SSD local disk
   - specific ``qsub`` :ref:`options <submit to Breniac 256 GB broadwell node>` apply

The nodes are connected using an Infiniband EDR network.


|Breniac hardware|


Breniac storage
---------------

Your ``$VSC_HOME`` and ``$VSC_DATA`` directory are mounted on the Breniac
login and compute nodes.  See your VSC institute's information on local
storage about policies and quota.  Also check the :ref:`VSC storage
guidelines <data location>` for information on what to store where.

.. note::

   ``$VSC_HOME`` and ``$VSC_DATA`` are mounted using NFS, so they can not
   be used for parallel I/O.  If your software benefits from using a
   parallel file system, please use ``$VSC_SCRATCH``.


+--------------------------+--------+----------+--------+----------------+
|Variable                  | Type   |  Access  |Backup  | Default quota  |
+==========================+========+==========+========+================+
|$VSC_SCRATCH              | GPFS   |  breniac |NO      | 1 TB           |
|$VSC_SCRATCH_SITE         |        |          |        |                |
+--------------------------+--------+----------+--------+----------------+
|$VSC_SCRATCH_NODE         | ext4   | breniac, |NO      | 75 GB          |
|                          |        | job only |        |                |
+--------------------------+--------+----------+--------+----------------+

The path names given below should be adapted to reflect your home
institution and VSC account number.

+--------------------------+------------------------------+
|Variable                  |Name                          |
+==========================+==============================+
|$VSC_HOME                 |/user/leuven/30X/vsc30XYZ     |
+--------------------------+------------------------------+
|$VSC_DATA                 |/data/leuven/30X/vsc30XYZ     |
+--------------------------+------------------------------+
|$VSC_SCRATCH              |/scratch/leuven/30X/vsc30XYZ  |
|$VSC_SCRATCH_SITE         |                              |
+--------------------------+------------------------------+
|$VSC_SCRATCH_NODE         |/local_scratch                |
+--------------------------+------------------------------+


.. |Breniac hardware| image:: breniac_hardware/breniac.png
  :width: 800
  :alt: Breniac hardware diagram