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Remote Access Review. HDice Michael Lowry December 1, 2010 . HDice. Identify Lab systems in your area that are remotely accessed or will be in the near future
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Remote Access Review HDice Michael Lowry December 1, 2010
HDice • Identify Lab systems in your area that are remotely accessed or will be in the near future • HDiceDF – a Windows pc monitoring and controlling an Oxford Instruments dilution refrigerator that polarizes (at 12 mK and 15T) and then ages (for 3 months) our HD targets. • HDiceSD – a Windows pc monitoring and controlling a Janus dewar that stores previously polarized and aged targets. • HDiceIBC – a Windows pc monitoring and controlling a cryostat, currently under construction, that will hold an HD target in the photon or electron beam inside CLAS and will undergo testing in the HDice area in the TestLab Annex.
HDice • Explain how your systems are remotely accessed • All the pc’s use LabView program modules, called Virtual Instruments (VI’s), for monitoring and control. LabView provides a limited, specialized, web server that can generate a web page displaying a snapshot of the current front panel of a requested VI, viewable in any web browser. • on-site (e.g. office) One would use a browser to pop up the index page of one of the machines directly and follow the links on that page to view a selected VI front panel. • off-site (e.g. home) One would apparently do the same but now one is actually contacting a CC firewall computer maintaining three HTTP (port 80) tunnels to and from the three pc’s.
HDice • Engineered solutions, policies, procedures, operations and QA/performance measures • The pc’s would operate and be maintained as ordinary behind-the-firewall machines except • No automatic updates. The forced re-boot kills LabView and thus leaves the cryostats un-controlled and without monitoring. It is the responsibility of the HDice group to implement the updates in a timely manner, when it is safe to do so. • No power saving or screen locking. • Network scans exemption. Our experience at BNL was that the internal network scans would cause LabView to hang. • The CC firewall-tunnel machine would remain their responsibility.
HDice • Describe future plans or needs for enhancing/upgrading remote access, e.g. changed systems, different controls, access for PDAs, etc. • No changes or enhancements are planned or anticipated. • Note that the third machine is not yet implemented but is expected within the next couple months.
HDice • Comments • Thank you for your attention and your help.
