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In the case of the current mirroring architecture, it consists in checking that the index files are available on the mirrors, and that their signature matches the one of their homologous file on the reference server (hdlist and synthesis files in the case of Mandriva Linux). The indicator will be calculated on each mirror with a period in the order of 20 minutes.

In the P2P system, the index (a.k.a the metadata) is stored across the trusted peers. The index must be consistent against the index available on the publisher peer. Any change on the publisher peer has to be reflected in an update on the distributed index.

• Hierarchical mirroring infrastructure
  This indicator will be implemented by the EDOS mirror monitoring framework.
• WP4 P2P system infrastructure
  The consistency of the index will be checked at the application level, i.e at the KadoP layer in the system specification, by numbering and counting the index entries.