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Using nearline storage: Difference between revisions
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*Files larger than 300GB should be split in chunks of 100GB using the [[Archiving_and_compressing_files#Other_Useful_Utilities|split]] command or a similar tool. | *Files larger than 300GB should be split in chunks of 100GB using the [[Archiving_and_compressing_files#Other_Useful_Utilities|split]] command or a similar tool. | ||
== Using Nearline == | == Using Nearline == <!--T:22--> | ||
The basic model for using nearline is that you put files there, and later you may access them, like a normal filesystem, except that reading the files may involve a significant pause. You may also remove files from nearline. It's important to realize that Nearline files can be in sevearl different states: | The basic model for using nearline is that you put files there, and later you may access them, like a normal filesystem, except that reading the files may involve a significant pause. You may also remove files from nearline. It's important to realize that Nearline files can be in sevearl different states: | ||
* immediately upon creation, the file is on disk, not tape. this is mainly to avoid having to guess about when you're done putting the file into place. | * immediately upon creation, the file is on disk, not tape. this is mainly to avoid having to guess about when you're done putting the file into place. | ||
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* when such a file is recalled, it returns to the second state. | * when such a file is recalled, it returns to the second state. | ||
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Thus, you may wish to inquire about the status of a Nearline file: | Thus, you may wish to inquire about the status of a Nearline file: | ||
lfs hsm_state ~/nearline/def-mine/user/somefile | lfs hsm_state ~/nearline/def-mine/user/somefile | ||