Burke, S (Stephen) wrote:
If the storage system needs to keep more than one instance of a file to ensure a certain storage quality of service then I don't feel this should be published into the grid information system.
Well, maybe - but for the standard LCG custodial/online (Disk1Tape1) we *are* publishing both copies, at least assuming we publish the tape sizes at all. Secondly there's an accounting issue, the VO is probably going to be asked to pay for multiple permananent copies. Also there
The cost is mostly determined by the RP being Custodial; 3 copies at one site may be cheaper than 1 copy at another, so we would rather have to publish the actual pricing. Something for 2.1 maybe.
could be an impact on the meaning of the free space - you may think you have 100 Tb free but it may only be 50Tb if all files are duplicated. At least I think we need a clear and consistent definition so people know what to publish in a given case, e.g. if file sizes are published only once as used space then the free space should be divided by any duplication factor.
One could argue that the info provider should do that division for you!