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LCLS is committed to providing its users with their data in a timely and convenient fashion. Experiment data and metadata collected at LCLS may be stored at and retrieved from the facility for a period of ten years. The data retention practices described in this page are on a best effort basis, they depend on availability of the actual resources and may change at any time if these resources become unavailable. Historically we have been able to deliver on these lifetimes (with the exception of scratch where, twice, we had to delete data newer than 4 months), but we cannot guarantee them: available resources depend on the actual usage rate and available funding, which we do not fully control.
Policy by Folder
Space | Quota | Backup | Lifetime | Comment |
|---|---|---|---|---|
xtc | None | Tape archive | 4 months | Raw data |
usrdaq | None | Tape archive | 4 months | Raw data from users' DAQ systems |
hdf5 | None | Tape archive | 4 months | Data translated to HDF5 |
scratch | None | None | 4 months | Temporary data (lifetime not guaranteed) |
results | 4TB, 10K files | Tape backup | 2 years | Analysis results |
| calib | None | Tape backup | 2 years | Calibration data |
User home | 20GB | Disk + tape | Indefinite | User code |
Tape archive | - | - | 10 years | Raw data (xtc, hdf5, usrdaq) |
| Tape backup | - | - | Indefinite | User home, results and calib folder |
| Disk backup | - | - | Indefinite | Accessible under ~/.zfs/ |
For older experiments this folder is called res instead of results
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- Please do not store large files under your home, this space is meant for code/scripts, documents, etc, not science data.
- Users can check the used and available space under their home with a command like:
df -h ~<username>
- Users can automatically access snapshots of the backup of their home here:
~<username>/.zfs/snapshot/Cleanup of xtc and hdf5 data
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