> What is annoying is that dcache even when it knows that all pools are
> online and it knows very well that we don't have a tape it will hapilly
> report that the file is there and wait forever for the tape (what bloody
> tape?) to deliver the file.
The problem is that dCache was designed to run at sites that have some
form of MSS backend. Running in "disk only" mode is something that is
relatively new.
> That's the price you pay for having two independent databases keeping
> information about the same data. Sooner or later they *will* get out of
> sync. We *are* going to loose files, if it's a hadrware or a software error
> isn't important. At the moment there is no way to sync the databases and
> I don't expect it to ever happen either :(
I agree that it is likely that the SRM databases and file catalogs will
get out of sync, but this is the system that we have to work with at the
moment. I think sites (where their resources allow) are already trying to
minimise the effect of failures by having some form of resiliency built in
(database backups, RAID, file replicas, redundant power supplies...).
Greig
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Dr Greig A Cowan http://www.ph.ed.ac.uk/~gcowan1
School of Physics, University of Edinburgh, James Clerk Maxwell Building
TIER-2 STORAGE SUPPORT PAGES: http://wiki.gridpp.ac.uk/wiki/Grid_Storage
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