View source for Euler maintenance (September 2017)

CSCS informed us that the data centre will be undergoing maintenance on '''Wednesday 27 and Thursday 28&nbsp;September 2017''', which will require a '''complete shutdown''' of Euler.

We will take this opportunity to do some additional maintenance on Euler itself the days '''before''' and '''after''' the CSCS maintenance. In particular, we will complete the '''upgrade of Euler to CentOS&nbsp;7''' and '''prepare for the installation of Euler&nbsp;IV''' later this year. The network at CSCS will also be updated on this occasion.

As a consequence we plan that:

* Euler compute nodes, login nodes, and storage systems will be '''off-line from 09:00, Tuesday 26 until the evening of Friday 29&nbsp;September'''; we will do our best to bring them back on-line ASAP.

* Batch queues will remain '''inactive throughout the weekend until Monday 2&nbsp;October 2017'''.

As usual, batch queues will be progressively inactivated in the days and hours prior to the maintenance, to ensure that no jobs get killed when the cluster is shut down.

''Sorry for the inconvenience.''

==Updates==

;'''2017-09-29 17:15'''

:'''The Euler cluster will remain unavailable until Tuesday 3 October 2017 to fix a critical security vulnerability disclosed during the maintenance ([https://access.redhat.com/security/vulnerabilities/3189592 CVE-2017-1000253])'''

;'''2017-10-02 16:20'''

:Our system administrators have '''fixed the security vulnerability''' in most of the nodes of the Euler cluster. We therefore decided that the '''login nodes of the Euler cluster will already be opened today'''. Users can login and access their files, but the '''queues stay inactivated''' due to further testing.

;'''2017-10-04 08:00'''

:We start to progressively open the batch queues starting with the 4h queue.

;'''2017-10-05 15:00'''

:All queues open again, Euler is back in production.