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Storage and file management: Difference between revisions
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(emphasize that scratch should not be used by default.) |
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* <b>HOME:</b> While your home directory may seem like the logical place to store all your files and do all your work, in general this isn't the case; your home normally has a relatively small quota and doesn't have especially good performance for writing and reading large amounts of data. The most logical use of your home directory is typically source code, small parameter files and job submission scripts. | * <b>HOME:</b> While your home directory may seem like the logical place to store all your files and do all your work, in general this isn't the case; your home normally has a relatively small quota and doesn't have especially good performance for writing and reading large amounts of data. The most logical use of your home directory is typically source code, small parameter files and job submission scripts. | ||
* <b>PROJECT:</b> The project space has a significantly larger quota and is well adapted to [[Sharing data | sharing data]] among members of a research group since it, unlike the home or scratch, is linked to a professor's account rather than an individual user. The data stored in the project space should be fairly static, that is to say the data are not likely to be changed many times in a month. Otherwise, frequently changing data, including just moving and renaming directories, in project can become a heavy burden on the tape-based backup system. | * <b>PROJECT:</b> The project space has a significantly larger quota and is well adapted to [[Sharing data | sharing data]] among members of a research group since it, unlike the home or scratch, is linked to a professor's account rather than an individual user. The data stored in the project space should be fairly static, that is to say the data are not likely to be changed many times in a month. Otherwise, frequently changing data, including just moving and renaming directories, in project can become a heavy burden on the tape-based backup system. | ||
* <b>SCRATCH</b>: For intensive read/write operations on large files (> 100 MB per file), scratch is the best choice. However, remember that important files must be copied off scratch since they are not backed up there, and older files are subject to [[Scratch purging policy|purging]]. The scratch storage should therefore be used for temporary files: checkpoint files, output from jobs and other data that can easily be recreated. | * <b>SCRATCH</b>: For intensive read/write operations on large files (> 100 MB per file), scratch is the best choice. However, remember that important files must be copied off scratch since they are not backed up there, and older files are subject to [[Scratch purging policy|purging]]. The scratch storage should therefore be used for temporary files: checkpoint files, output from jobs and other data that can easily be recreated. <b>Do not regard SCRATCH as your normal storage! It is for transient files that you can afford to lose.</b> | ||
* <b>SLURM_TMPDIR</b>: While a job is running, <code>$SLURM_TMPDIR</code> is a unique path to a temporary folder on a local fast filesystem on each compute node reserved for the job. This is the best location to temporarily store large collections of small files (< 1 MB per file). Note that this space is shared between jobs on each node and the total available space depends on the node specifications. Finally, when the job ends, this folder is deleted. A more detailed discussion of using <code>$SLURM_TMPDIR</code> is available at [[Using_$SLURM_TMPDIR | this page]]. | * <b>SLURM_TMPDIR</b>: While a job is running, <code>$SLURM_TMPDIR</code> is a unique path to a temporary folder on a local fast filesystem on each compute node reserved for the job. This is the best location to temporarily store large collections of small files (< 1 MB per file). Note that this space is shared between jobs on each node and the total available space depends on the node specifications. Finally, when the job ends, this folder is deleted. A more detailed discussion of using <code>$SLURM_TMPDIR</code> is available at [[Using_$SLURM_TMPDIR | this page]]. | ||