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# Quota purpose
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# Quota purpose
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Storage space is finite and expensive. For this reason, space allocated to each laboratory, platform and user is limited by a quota.
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Storage space is finite and expensive. For this reason, space allocated to each research team, platform and user is limited by a quota.
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Quota are also needed to prevent a user to fill the whole disk space, for exemple with an uncontrolled loop in a script, and to block the whole system.
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Quota are also needed to prevent a user to fill the whole disk space, for example with an uncontrolled loop in a script, and to block the whole system.
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**WARNING**: Once the quota of a folder is reached, users stop being able to write in it. If this happen while saving files, it may lead to data corruption and lost of data. Some tools will give a warning or an error message but others won't. **It's the user's responsibility to make sure there is enough space to write in the folder.**
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**WARNING**: Once the quota of a folder is reached, users stop being able to write in it. If this happen while saving files, it may lead to data corruption and lost of data. Some tools will give a warning or an error message but others won't. **It's the user's responsibility to make sure there is enough space to write in the folder.**
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# Quota implementation
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# Quota implementation
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The space of the **user personal home** is limited to **100 GB**. All files in the user's personnal folder and subfolders are included in this quota, but not the files the user can reach through the "Research", "Platforms", "Administration" or "Resources" links in the ""\_SHARE\_" folder. Once this limit is reached, the user won't be able to create/save any file in their home.
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Space in the **user personal home folder** is limited to **100 GB**. All files in the user's home folder and in all subfolders are included in this quota, but not files the user can reach through the "Research", "Platforms", "Administration" or "Resources" links in the ""\_SHARE\_" folder. Once this limit is reached, the user won't be able to create/save any file in their home.
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For the Research Units, quotas are set at the level of **research laboratories** (see "Laboratories" column in the [URT tree structure](mass-storage/mass-storage-URT)). This means that these quotas are shared between groups belonging to the same laboratory. Once a laboratory reaches its quota, it's not possible to write anything in any of the group and project folders attached to that laboratory.
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For Research Units, quotas are set at the level of **research laboratories** (see "Laboratories" column in the [URT tree structure](mass-storage/mass-storage-URT)). This means that these quotas are shared between teams belonging to the same laboratory. Files transferred by the platforms to research teams via the [platform-shared folders](mass-storage/mass-storage-structure-organisation#Platform-shared-folders) are also included in the laboratory's quota. Once a laboratory reaches its quota, it's not possible to write anything in any of the teams, SHARE, PLATFORMS and projects folders attached to that laboratory.
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For the **Platforms**, quotas are set at the level of the groups (see "Groups" column in the [PTF tree structure](mass-storage/mass-storage-PTF)). Files transferred by the platforms to research groups via the [platform-shared folders](mass-storage/mass-storage-structure-organisation#Platform-shared folders) are not included in the platform's quota but in the associated research laboratory's quota.
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For **Platforms**, quotas are set at the level of the teams (see "Teams" column in the [PTF tree structure](mass-storage/mass-storage-PTF)). Files transferred by the platforms to research teams via the [platform-shared folders](mass-storage/mass-storage-structure-organisation#Platform-shared-folders) are not included in the platform's quota but in the associated research laboratory's quota.
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# Practical considerations
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# Practical considerations
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