Advice: Network switch problem within Polaris: 2016-05-13

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We experienced some network related problems within Polaris between about 11:40 and 12:10 that affected a limited number of machines. For example, some of the Euramoo login nodes were rejecting logins.

The problems have stopped for now. Engineers are investigating to determine the root cause.

UPDATE - The diagnosis of the problem is that there are hardware / firmware problems with the pair of DataIO network switches.  This has been causing intermittent problems for some services including (at various times) Flashlite and the "QRIScloud-rdc" ceph cluster.

UPDATE -The problems were resolved by updating the firmware.

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