Ciao Sergio,
ExpirationMode and its values
---------------------------------------------------------------------- The Expiration Modes of a container indicate if it supports files with infinite and/or finite lifetimes, and what actions the storage system may take upon the expiration of a file. The value NeverExpire indicates support for files with infinite lifetime: they can only be removed by authorized clients, not by the storage system itself. The value WarnWhenExpired indicates support for files that have finite lifetimes, but on expiration cannot be removed by the storage system itself. The data content of an expired file may be deleted if it can be recovered from an archive. New store operations may fail for certain clients until (some of the) expired files have either been removed by authorized clients, or have had their lifetimes increased. The value ReleaseWhenExpired indicates support for files that have finite lifetimes and on expiration will be removed by the storage system. ----------------------------------------------------------------------
AccessLatency and its values
---------------------------------------------------------------------- The Access Latency of a container indicates the maximum latency for a file stored in that container to be made available for reading. The latency ONLINE indicates that files are always on disk, hence cannot have their latency improved. The latency NEARLINE indicates that a file may have its only copies in a "nearly online" component of the storage system, typically a fully automated tape robot, but also a remote storage system could fit this qualification. Such a facility will need an unspecified amount of time to make a copy of the file available on the disk component of the container under consideration. When a file is not in use, its disk copies may be removed. Hence the system cannot guarantee that a file will be immediately available on disk. The latency OFFLINE indicates that a file may have its only copies in an offline component of the storage system, for example a tape library that is not connected to an automated tape robot. Hence an operator intervention may be needed to make a copy of a file available that has a lower latency. ----------------------------------------------------------------------