londongrid.blogspot.com
LondonGrid: The art of cabling
http://londongrid.blogspot.com/2013/04/the-art-of-cabling.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Sunday, April 21, 2013. The art of cabling. The challenge of organising your cables behind your TV is nothing compared to that of a large computing cluster. However this does add cable complexity. The backup 1 gig switches connect to each other in a daisy chain using 10 Gb cx4 cables, left over from before our 10 Gb upgrade. Finally the ipmi switches con...The p...
londongrid.blogspot.com
LondonGrid: XrootD and ARGUS authentication
http://londongrid.blogspot.com/2014/10/xrootd-and-argus-authentication.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Wednesday, October 08, 2014. XrootD and ARGUS authentication. A couple of months ago, I set up a test machine running XrootD. Version 4 at QMUL. This was to test three things:. IPv6 (see blog post. Central authorisation via ARGUS (the subject of this blog post). For the new machine, I started by following ATLAS's Fax for Posix storage sites. Secprotocol /usr/lib...
londongrid.blogspot.com
LondonGrid: 08/01/2007 - 09/01/2007
http://londongrid.blogspot.com/2007_08_01_archive.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Tuesday, August 07, 2007. UCL-HEP APEL accounting fixed. After upgrading to gLite r27 on the 4th of July, APEL stopped publishing to the central RGMA registry. The apel-publisher failed with a not handled. To fix this, we had to update to the latest version of the APEL rpm's (2.0.5-1) on the MON and CE and re-run YAIM on both. Subscribe to: Posts (Atom).
londongrid.blogspot.com
LondonGrid: 06/01/2007 - 07/01/2007
http://londongrid.blogspot.com/2007_06_01_archive.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Tuesday, June 26, 2007. Promised to monitor the bdii. This is the plot of the bdii count a while ago. I'll have to redo it for a longer period. It seems clear that it is not the entire site bdii that disappear but only individual entries. Which is very probably correlated with load. We have seen it with the ce mds. Posted by Olivier van der Aa. From friday after...
londongrid.blogspot.com
LondonGrid: 03/01/2008 - 04/01/2008
http://londongrid.blogspot.com/2008_03_01_archive.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Wednesday, March 26, 2008. Our machine room aircon system broke down last week and the temperatures have been all over the place. It has been stable the last few days so I've just brought the cluster back up. The site will come out of downtime this evening. Subscribe to: Posts (Atom).
londongrid.blogspot.com
LondonGrid: Serial Consoles over ipmi
http://londongrid.blogspot.com/2013/06/serial-consoles-over-ipmi.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Tuesday, June 04, 2013. Serial Consoles over ipmi. To get Serial Consoles over ipmi working properly with Scientific Linux 6.4 (aka RHEL 6.4 / centos 6.4) I had to modify several setting both in the BIOS and in the OS. For Dell C6100 I set these setting in the BIOS. Remote Access = Enabled. Serial Port Number = COM2. Serial Port Mode = 115200 8,n,1. Serial - uni...
londongrid.blogspot.com
LondonGrid: virtualization performance hit
http://londongrid.blogspot.com/2013/04/like-rest-of-world-is-lot-of-discussion.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Monday, April 15, 2013. Like the rest of the world, there is a lot of discussion going about the use of clouds and virtualization in gridpp. Http:/ www.gridpp.ac.uk/gridpp30/mcnab-lhcb-vmclouds-march-2013.pdf. Http:/ www.admin-magazine.com/HPC/articles/the cloud s role in hpc. Http:/ www.altechnative.net/2012/08/04/virtual-performance-part-1-vmware/. This is not...
londongrid.blogspot.com
LondonGrid: 04/01/2008 - 05/01/2008
http://londongrid.blogspot.com/2008_04_01_archive.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Wednesday, April 16, 2008. Exercised space token creation at UCL-HEP. Thought it was neat to give it a try and created as a test a small reservation for dteam, following the instructions on the LCG Twiki. All went well and all the tweaks for SL3 / gLite 3.0 worked well. Only oddity was that:. Send2nsd: NS009 - fatal configuration error: Host unknown: UNUSED.
londongrid.blogspot.com
LondonGrid: RHUL 'Newton' cluster comes home
http://londongrid.blogspot.com/2010/02/rhul-newton-cluster-comes-home.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Friday, February 19, 2010. RHUL 'Newton' cluster comes home. After two years hosted by Imperial College, our 'Newton' Grid computing cluster has finally been relocated to Royal Holloway's new state-of-the-art computer centre. The move was carried out by Clustervision. Subscribe to: Post Comments (Atom).
londongrid.blogspot.com
LondonGrid: 07/01/2009 - 08/01/2009
http://londongrid.blogspot.com/2009_07_01_archive.html
LondonGrid is a regional Tier 2 of GridPP, distributed between the Universities of Queen Mary, Imperial College, Royal Holloway, Brunel and UCL. Friday, July 31, 2009. Comparing ATLAS analysis at RHUL using the file-staging and RFIO approaches. I have been looking at the performance of the Royal Holloway cluster during Hammercloud tests in which data was accessed directly from the DPM pool nodes using the RFIO protocol and comparing it to the recent UK-wide file-staging test ( 540. Posted by Duncan Rand.