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On Thu, Jul 07, 2005 at 10:38:30PM +0100 or thereabouts, Gordon, JC (John) wrote: > Maybe I am nitpicking Greg, but just to spell it out for the others: dpm > DOESN'T need the data migrating, just metadata adding (allegedly). > dCache DOES needs data migration as its data is stored in its own > format. For dCache we believe we could migrate an existing classic system with out to much difficulty. Though the file paths might end up being prefixed by /pnfs/gridpp.rl.ac.uk/data/cms or whatever. Steve > > John > > > -----Original Message----- > > From: Testbed Support for GridPP member institutes > > [mailto:[log in to unmask]] On Behalf Of Greig A Cowan > > Sent: 07 July 2005 19:44 > > To: [log in to unmask] > > Subject: Re: DPM source RPMS > > > > > My understanding is that one of the selling points for DPM > > is that it > > > allows pointers to files in the old SE to remain valid (so > > that sites > > > don't have to maintain classic_SEs in perpetuity) - which rather > > > undermines that assumption! > > > > DPM only requires metadata operations to migrate data stored on the > > classic SE into DPM (which has an SRM interface). The > > situation for dCache > > is more complex, but I believe (can anyone confirm?) that a fix is > > currently being worked upon to provide some sort of data > > migration tool > > from the classic SE to dCache. > > > > Greig > > > > > > > > Have I got this wrong? (_very_ possible!) Are we supposed > > to be thinking > > > in terms of moving to an SRM SE rather than upgrading the > > current one > > > (which DPM was supposed to allow)? > > > > > > Thanks > > > > > > Henry > > > > > > > > > > -- > > ============================================================== > > ========= > > Greig Cowan e: [log in to unmask] > > School of Physics t: +44 131 650 5300 > > The University of Edinburgh f: +44 131 650 7189 > > James Clerk Maxwell Building w: > > http://www.ph.ed.ac.uk/~gcowan1 > > Mayfield Road > > Edinburgh > > EH9 3JZ, UK > > ============================================================== > > ========= > > -- Steve Traylen [log in to unmask] http://www.gridpp.ac.uk/