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On Mon, Apr 5, 2010 at 9:55 AM, Martin Bly <[log in to unmask]> wrote: > Tier1 Fabric and Tier1 Services are aware that the 5 top-level BDII servers at RAL are sporadically failing to respond with the required alacrity. The data shows that this is due in part to a local imbalance in requests to the servers but mostly the machines concerned are under-powered now that data taking has begun. Steps will be taken to remedy this issue during the week. > Just to check you are aware about a possible cause for the inbalence in requests. https://twiki.cern.ch/twiki/bin/view/LinuxSupport/GlibcDnsLoadBalancing working around that is operationally tricky. Putting the hosts in different subnets and/or sites is the best but hardly convenient. Some of lcg-bdii.cern.ch will be moving to different subnets shortly to try and help with this. > Martin. > > -- > Martin Bly > RAL Tier1 Fabric Manager > >> -----Original Message----- >> From: Testbed Support for GridPP member institutes [mailto:TB- >> [log in to unmask]] On Behalf Of John Bland >> Sent: Monday, April 05, 2010 1:46 AM >> To: [log in to unmask] >> Subject: lcg-bdii.gridpp.ac.uk problems >> >> Hi, >> >> Liverpool have failed a number of SAM tests over the last day or so, >> which seem to have all resulted from missing entries in BDII or being >> unable to connect to lcg-bdii.gridpp.ac.uk. >> >> Other sites have had a number of failed tests over the same period. >> We've also seen a number of temporary blips in our SAM tests over the >> past few weeks, resulting from a lack of entries for our SE in BDII. >> We've been unsure if this is anything to do with our glite 3.2 BDII or >> a >> flaky VM system. >> >> As some of the recent tests have included lack of entries for external >> systems as well I'm wondering if the GridPP BDII server is experiencing >> problems for other sites as well and if other Tier2 sites without >> problems are using a different top BDII. >> >> Should we all be using the same BDII or is there something to be gained >> from a *coordinated* distribution of external services to mitigate the >> otherwise single point of failure that BDIIs can represent within the >> UK >> cloud? >> >> John >> >> -- >> Dr John Bland, M.Phys.(Hons), Ph.D. (Liverpool) >> Email: [log in to unmask] >> Phone: 0151 256 7055, Mobile: 07794 935 213 >> Web : http://www.third-bird.co.uk/photography/ >> "Happy Happy Joy Joy Joy!" - Stimpy > -- Steve Traylen