On Thu, 7 Jul 2005, 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).
Yes - but does the data still remain accessible via its old SURL, which
may be in various file catalogs and which we keep being reminded that we
shouldn't break?
The subtext to my question (and the relevance to Jamie's point) is really
"will I need another machine, host certificate etc. for the upgrade?"
Thanks
Henry
> dCache DOES needs data migration as its data is stored in its own
> format.
>
> 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
> > ==============================================================
> > =========
--
Dr. Henry Nebrensky [log in to unmask]
http://people.brunel.ac.uk/~eesrjjn
"The opossum is a very sophisticated animal.
It doesn't even get up until 5 or 6 p.m."
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