[glue-wg] RetentionPolicy definitions

[Sergio Andreozzi]

thanks. Added in draft 37:
http://forge.ogf.org/sf/go/projects.glue-wg/docman.root.drafts

- Sergio

Maarten.Litmaath at cern.ch wrote:
>   
>> 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.
> ----------------------------------------------------------------------
>
>   


-- 
Sergio Andreozzi
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