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Using nearline storage: Difference between revisions
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This is useful because the capacity of our tape libraries is both large and expandable. When a file has been moved to tape (or ''virtualized''), it still appears in the directory listing. If the virtual file is read, the reading process will block for some time, probably a few minutes, while the file contents is copied from tape to disk. | This is useful because the capacity of our tape libraries is both large and expandable. When a file has been moved to tape (or ''virtualized''), it still appears in the directory listing. If the virtual file is read, the reading process will block for some time, probably a few minutes, while the file contents is copied from tape to disk. | ||
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You can tell that a file is on tape or still on disk with the <code>lfs hsm_state</code> command: | You can tell that a file is on tape or still on disk with the <code>lfs hsm_state</code> command: | ||
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<source lang="bash"> | <source lang="bash"> | ||
# Here, <FILE> is still on the disk | # Here, <FILE> is still on the disk | ||
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<FILE>: [...]: exists archived, [...] | <FILE>: [...]: exists archived, [...] | ||
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# Here, <FILE> is archived on tape, there will be a lag when opening it. | # Here, <FILE> is archived on tape, there will be a lag when opening it. | ||
$ lfs hsm_state <FILE> | $ lfs hsm_state <FILE> | ||
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</source> | </source> | ||
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"HSM" stands for "hierarchical storage manager". If you wish to ensure that the file is brought in from tape, you can use | "HSM" stands for "hierarchical storage manager". If you wish to ensure that the file is brought in from tape, you can use | ||
lfs hsm_restore <FILE> | lfs hsm_restore <FILE> | ||