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All BIAC users should have plans to back up their data to protect against disk failures. | All BIAC users should have plans to back up their data to protect against disk failures. | ||
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====== BIAC Experiment Data Backup Policies ====== | ====== BIAC Experiment Data Backup Policies ====== | ||
BIAC employs a multi-level data protection strategy, which offers users comprehensive backup and restore options. Though this is a service provided by BIAC, this does not preclude you from implementing your own backup or mirroring strategy, if you so desire. It is always a good idea to back up any and all data that you would be sorry to lose. See below for suggestions. | BIAC employs a multi-level data protection strategy, which offers users comprehensive backup and restore options. Though this is a service provided by BIAC, this does not preclude you from implementing your own backup or mirroring strategy, if you so desire. It is always a good idea to back up any and all data that you would be sorry to lose. See below for suggestions. | ||
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===== Automatic Archiving of Raw MR Data ===== | ===== Automatic Archiving of Raw MR Data ===== | ||
All of the raw MRI files that come directly from the MRI scanners (DICOM and P-files) are automatically backed up to tape. These tapes are kept indefinitely. | All of the raw MRI files that come directly from the MRI scanners (DICOM and P-files) are automatically backed up to tape. These tapes are kept indefinitely. | ||
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===== Automatic Nightly Mirror of Specific Experiment Subdirectories ===== | ===== Automatic Nightly Mirror of Specific Experiment Subdirectories ===== | ||
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===== User-Configurable Snapshots of Experiment Directories ===== | ===== User-Configurable Snapshots of Experiment Directories ===== | ||
- | You can request to have snapshots set up for your data directories. A snapshot is a point-in-time, | + | You can request to have snapshots set up for your data directories. A snapshot is a point-in-time, |
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==== How to check your snapshots ==== | ==== How to check your snapshots ==== | ||
- | Every data directory on Munin has a hidden snapshot directory (called ~snapshot). Inside you will find directories that correspond to your snapshots. Within those snapshot directories, | + | Every data directory on Munin has a hidden snapshot directory (called ~snapshot). Inside you will find directories that correspond to your snapshots. Within those snapshot directories, |
- | If your data are on Hill or Fatt, you can right-click your data directory and then click on the '' | + | ==== Default Snapshot Rules ==== |
+ | If you don't specify any snapshot rules, you will get the following default rules. | ||
+ | - Snapshot every night at 11:00 PM. Save 4 snapshots. | ||
+ | - Snapshot every Sunday night at 11:00 PM. Save 3 snapshots (i.e., 3 weeks). | ||
==== Example Snapshot Rules ==== | ==== Example Snapshot Rules ==== | ||
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- Snapshot every Sunday at 6:00 AM. Save 12 snapshots (i.e., 12 weeks). | - Snapshot every Sunday at 6:00 AM. Save 12 snapshots (i.e., 12 weeks). | ||
- Snapshot on 1st of every month at 11:00 PM. Save 6 snapshots (i.e., 6 months). | - Snapshot on 1st of every month at 11:00 PM. Save 6 snapshots (i.e., 6 months). | ||
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==== Notes ==== | ==== Notes ==== | ||
- | * The snapshots will take up space in your directory. If your directory gets close to full, the oldest existing snapshots will need to be deleted to free up space. | + | * The snapshots will take up space in your directory, unless files are never changed, added or deleted. If your directory gets close to full, the oldest existing snapshots will need to be deleted to free up space. |
* It may be tempting to save 6 months of snapshots, but that will mean that when you delete a file or directory, its space will not be freed for 6 months. | * It may be tempting to save 6 months of snapshots, but that will mean that when you delete a file or directory, its space will not be freed for 6 months. | ||
* The more files change between snapshots, the more space will be taken up by the next snapshot. On the flip side, if nothing changes between snapshots, the snapshot will take up no space. | * The more files change between snapshots, the more space will be taken up by the next snapshot. On the flip side, if nothing changes between snapshots, the snapshot will take up no space. |