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Using nearline storage: Difference between revisions
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(A note about Globus access) |
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When a file has been moved entirely to tape (that is, when it is ''virtualized'') it will still appear in the directory listing. If the virtual file is read, it will take some time for the tape to be retrieved from the library and copied back to disk. The process which is trying to read the file will block while this is happening. This may take from less than a minute to over an hour, depending on the size of the file and the demand on the tape system. | When a file has been moved entirely to tape (that is, when it is ''virtualized'') it will still appear in the directory listing. If the virtual file is read, it will take some time for the tape to be retrieved from the library and copied back to disk. The process which is trying to read the file will block while this is happening. This may take from less than a minute to over an hour, depending on the size of the file and the demand on the tape system. | ||
== Transferring data from Nearline == | == Transferring data from Nearline == <!--T:53--> | ||
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Before starting [[Transferring_data|any transfer]] with [[Globus]] or else, make sure all the data is back to disk. Otherwise, transfers will constantly hang and probably overload the tape storage system. | Before starting [[Transferring_data|any transfer]] with [[Globus]] or else, make sure all the data is back to disk. Otherwise, transfers will constantly hang and probably overload the tape storage system. | ||