Dealing with orphans: catalogue synchronisation with SynCat
Presented by Dr. Paul MILLAR on 26 Mar 2009 from 08:00 to 08:20
Session: Poster session
Track: Grid Middleware and Networking Technologies
Board #: Thursday 020
In the gLite grid model a site will typically have a Storage Element (SE) that has no direct mechanism for updating any central or experiment-specific catalogues. This loose coupling was a deliberate decision that simplifies SE design; however, a consequence of this is that the catalogues may provide an incorrect view of what is stored on a SE. In this paper, we present work to allow catalogue re-synchronisation. This shows how catalogues can be more certain that the files are stored on the SE and how more transitory metadata may be propagated with low latency; for example, whether a file stored on tape is currently available on disk.