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and modules that are orchestrate in different fashions, the data processing activities
are to be developed, tested, debugged and deployed on an application-basis. To
support the users in these challenges, HELIOGate has set up a set of test nodes in its
cluster that users can use to debug and test their applications. Experience has
suggested that users who are accustomed to developing and executing their
application in a more traditional fashions, as an example, through an ssh login, have
dif
culties doing so through the workflow-oriented interfaces of SCI-BUS. This has
suggested reserving ssh access to test nodes for application developers to allow
them use a familiar environment for the testing of their applications. This solution
was made possible by the small size of the Heliophysics community and cannot be
scaled for larger groups. The infrastructure of HELIOGate has been managed with
the de
nition of the worker nodes of the PBS
cluster and the server head-nodes for the storage, while the virtual machines that
host the gateway instances are managed and backed up manually.
nition of puppet pro
les for the de
14.8 Conclusions
Although the solutions adopted both for propagation models and data processing
have proven useful to the community so far, there is still a significant number of
objectives that are being tackled to improve the usability and sustainability of
HELIOGate. These activities deal with two main areas. First, to foster sustainability
and to reduce the dependency of the HELIOGate services on the aging PBS cluster
managed in Trinity College Dublin, an effort is under way to upgrade the gateway
to 3.6.1 and to connect it to cloud resources. Technical details on how to adapt the
current infrastructure (especially as concerns the storage and the IDL7.1 and SSW
current installations) to the cloud are currently under investigation. The second
main area of improvement of HELIOGate will be to implement a SHIWA sub-
mission service on the PBS cluster that allows the execution of TAVERNA
workflows from the gateway substituting the GEMLCA service. The successful
completion of these steps will offer to the Heliophysics community a powerful and
flexible environment where scientists will be able to cooperate in the investigation
of the relationship between the Sun and the other bodies of the Solar System by
building workflows and assembling metaworflows, regardless of the workflow
language of choice.
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