Translations:Storage and file management/20/en
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| Filesystem | Default Quota | Lustre-based? | Backed up? | Purged? | Available by Default? | Mounted on Compute Nodes? |
|---|---|---|---|---|---|---|
| Home Space | 50 GB and 500K files per user[1] | Yes | Yes | No | Yes | Yes |
| Scratch Space | 20 TB and 1M files per user | Yes | No | Files older than 60 days are purged.[2] | Yes | Yes |
| Project Space | 1 TB and 500k files per group[3] | Yes | Yes | No | Yes | Yes |
- ↑ This quota is fixed and cannot be changed.
- ↑ See Scratch purging policy for more information.
- ↑ Project space can be increased to 10 TB per group by a RAS request. The group's sponsoring PI should write to technical support to make the request.
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| location | quota | block size | expiration time | backed up | on login nodes | on compute nodes | |
|---|---|---|---|---|---|---|---|
| $HOME | 100 GB per user | 1 MB | yes | yes | read-only | ||
| $SCRATCH | 25 TB per user (dynamic per group) | 16 MB | 2 months | no | yes | yes | |
| up to 4 users per group | 50TB | ||||||
| up to 11 users per group | 125TB | ||||||
| up to 28 users per group | 250TB | ||||||
| up to 60 users per group | 400TB | ||||||
| above 60 users per group | 500TB | ||||||
| $PROJECT | by group allocation (RRG or RPP) | 16 MB | yes | yes | yes | ||
| $ARCHIVE | by group allocation | dual-copy | no | no | |||
| $BBUFFER | 10 TB per user | 1 MB | very short | no | yes | yes | |
- Inode vs. Space quota (PROJECT and SCRATCH)
- dynamic quota per group (SCRATCH)
- Compute nodes do not have local storage.
- Archive(a.k.a. nearline) space is on HPSS
- Backup means a recent snapshot, not an archive of all data that ever was.
$BBUFFERstands for Burst Buffer, a faster parallel storage tier for temporary data.