On Thu, Apr 9, 2009 at 11:35 AM, Douglas J. Trainor<trai...@transborder.net> wrote: > Rahul, > > I think Greg et al. are correct. Does your SC1435 have a Delta Electronics > switching power supply? I bet you have a 600 watt Delta. > > Intel recently had problems with outsourced 350 watt "FHJ350WPS" switching > power supplies that apparently affected 5% of some server lines. These were > loading imbalance problems between the 3.3 volt and 12 volt lines. The > affected power supplies had a minimum loading requirement that was not met. > The over-voltage protection circuit would kick in on the 3.3V line. > However, in these cases, the Intel machines would not reboot. Intel is > modifying the 3.3 volt minimum loading from 1.2 amps to 0.2 amps to fix the > problem.
A while ago I had posted about these crashing SC1435's that I had. I received lots of good suggestions on this group. Thanks all! A lot of persistence with the vendor succeed in making their Engineering team do long-run tests on one of our captured machines. It needed to be tested for over one month and then they finally replicated the failure. Whew! (In the past they had aborted tests way before this time period) They won't give me many internal details but apparantly it is caused by an "hardware issue more likely caused certain motherboards with Opterons" [sic] So, thank again and it does seem that we finally got down to the cause of this irritating problem! Just posted this in case it helps any other SC1435 admins in a similar boat! Cheers! -- Rahul _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
