Commit a0426a03 authored by Maiken's avatar Maiken

In progress of reviewing instructions. Not finalized yet.

parent a5b10833
Pipeline #5412 passed with stage
in 3 minutes and 24 seconds
......@@ -10,12 +10,13 @@ PREREQUISITES
Choosing the host
-----------------
It is assumed that ARC CE is installed on top of an existing Linux computing cluster.
Many Linux distributions `are supported <http://download.nordugrid.org/repos.html>`_.
Many Linux distributions `are supported <http://download.nordugrid.org/repos-6.html>`_.
ARC works well also on a complete virtual computing cluster environment in a cloud.
ARC is non-intrusive towards existing systems. We suggest to deploy ARC CE on a dedicated (virtual) machine connected to the cluster network and filesystem.
If needed, it is even possible to communicate with the cluster over SSH from a completely independent remote ARC node.
If needed, it is even possible to communicate with the cluster over SSH from a completely independent remote ARC node. [If we mention this we should link to documentation... Where do we have this?]
ARC software is very lightweight and does not require powerful machines to run, however if ARC CE will perform data transfers the requirements are higher.
As a minimum, a production CE with 4 cores and 8GB of RAM should be capable of handling up to 10,000 concurrent jobs without problems.
......@@ -26,13 +27,10 @@ Plan for storage areas
Several storage areas are necessary for job submission, execution and data storing. You should mount/export following directories:
* session directory
* data staging cache directory (if planned)
* decide to what extent to use NOT cross-mounted scratch directory on the worker nodes
* :ref:`session directory <reference_sessiondir>`
* :ref:`data staging cache directory <reference_cachedir>` (if planned)
* decide to what extent to use NOT cross-mounted :ref:`scratch directory <reference_scratchdir>` scratch directory on the worker nodes
[TODO: what is session dir]
[TODO: what is cache]
[TODO: local scratch]
Local resource management system (LRMS)
---------------------------------------
......@@ -62,9 +60,8 @@ Plan for local account(s) (or account pools) that will be used to execute jobs o
These accounts should be also available on the ARC CE node.
Please note that ARC services are ran as root on the ARC CE node and switch to an appropriate local account when processing job data staging and job execution.
This process is called *mapping*.
This process is called :ref:`mapping <reference_mapping>`.
[TODO: link to instructions - account pools and mapping]
INSTALLATION
......
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