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FYI CERN schedule on SLC5 migration. Let me highlight one paragraph that says majority of worker nodes across the Grid are expected to be on SL5 (equivalent) one month from now. > ... we will announce via the internal CERN > channels next week that LXPLUS will switch to SLC5 on Monday 5th > October. I hope that in the intervening month will be sufficient time > for SL5 to become the majority worker node system across the Grid---a > clear message to plan this migration was sent out in August after > discussions at the WLCG MB. -- Charles C. Young M.S. 43, Stanford Linear Accelerator Center P.O. Box 20450 Stanford, CA 94309 [log in to unmask] voice (650) 926 2669 fax (650) 926 2923 CERN GSM +41 76 487 2069 Begin forwarded message: > From: "Tony Cass" <[log in to unmask]> > Date: 4 September 2009 8:18:50 GMT+02:00 > To: "project-lcg-gdb (LCG - Grid Deployment Board)" <[log in to unmask] > > > Subject: Migration of LXPLUS service at CERN to SLC5 > > Dear all, > > For some months we have said that the migration of LXPLUS to SLC5 > would > happen when the majority of the Grid worker nodes were running an > RHES5/SL5 based system. This is no longer a tenable position for at > least two reasons: > > - Firstly, we need to have a stable period in the new configuration > before LHC operation restarts. This needs a fixed date for the > migration > some time in advance of mid-November. > > - Secondly, there is still a little of a "chicken and egg" situation: > reluctance to migrate to SLC5 without clear demand lest batch > resources > sit idle (a reasonable concern: SLC5 capacity at CERN, for example, is > underutilised) and no clear demand for SLC5 as users aren't aware of > the > resource situation. > > To address these two concerns, we will announce via the internal CERN > channels next week that LXPLUS will switch to SLC5 on Monday 5th > October. I hope that in the intervening month will be sufficient time > for SL5 to become the majority worker node system across the Grid---a > clear message to plan this migration was sent out in August after > discussions at the WLCG MB. > > Please note that SLC4 based interactive capacity will remain. Users > connecting simply to LXPLUS, however, will connect to SLC5 based > systems. > > Regards, > Tony >