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- Files on a data server are tarred independently from the other data servers.
- Using the file size to decide if a file should go into a tar. Size 500MB or 1GB? Are there files that should go directly into HPSS even if smaller?
- Files to be tarred should be sorted in order to increase the probability that a client might use more then one file from a tar.
- first sort by stem:
e.g.: /glast/mc/DC2/ChickenLittle-GR-v7r3p24-2 - sort by type: DIGI.root, MC.root, RECON.root, merit.root
Should types be mixed in a tar?
- first sort by stem:
- Create tar-file info (eventually this info should go into a database). Other values needed for a stat command (usser, permissions, file type) can be created on the fly.
- data file name
- size
- time put into tar (Could be the same for all files in a tar-file)
- Tar file size 2GB, 4GB ?
- How often should it run? Depends on how files should be sorted.
- Tar files are written to the local xrootd disks.
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