It is obvious as you are overestimating me!
-----Original Message-----
From: LHC Computer Grid - Rollout [mailto:[log in to unmask]]
On Behalf Of Burke, S (Stephen)
Sent: Tuesday, January 18, 2005 11:00 AM
To: [log in to unmask]
Subject: Re: [LCG-ROLLOUT] [ATLAS-LCG] Disk failure at Prague
> [mailto:[log in to unmask]] On Behalf Of Jules Wolfrat
said:
> That's true, but you must make a distinction between the database that
> RLS is and the physical file itself. The file itself can be destroyed
> while the RLS itself still thinks that the file is present. What you
> need is some mechanism to check the integrity of the RLS, e.g. run
> every night a consistency check on the RLS!
I certainly agree that we should be checking consistency, but you can't
recreate the catalogues just from what's on disk, you don't know the
guid or LFN, or indeed which files are replicas of each other without
doing something fairly elaborate with checksums. If the catalogues are
corrupted and the experiment doesn't keep its own record the files are
effectively lost even if they still exist.
Stephen
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