Storage
Below is a table of all available storage on Unity.
| Mountpoint | Name | Type | Quota | Description |
|---|---|---|---|---|
/home | Home directories | HDD | 50 GB | Home directories should be used only for user init files. |
/work/pi_ | Work directories | SSD | 1 TB | Work should be used as the primary location for running cluster jobs. This is a shared folder for all users in the PI group. |
/project | Project directories | HDD | As Needed | Project directories are available to PI’s upon request. Good for large dataset storage or any larger storage that is not directly used for job I/O. PI’s should e-mail hpc@umass.edu to request. A common use case is generating job output in /work and copying to permanent storage in /project afterwards. Not for job I/O |
/nese | NESE mounts | HDD/Tape | Varying | Legacy images available from the northeast storage exchange can be found here. Not for job I/O |
/nas | Buy-in NAS mounts | Varying | Varying | Legacy location where the mounts for buy-in NAS hardware are located on Unity. For users who purchased storage nodes for their own use on Unity only. |
/scratch | Scratch space | SSD | N/A | See the HPC Workspace scratch documentation |
/gypsum | Gypsum devices | HDD | Varying | For users migrating from the Gypsum cluster to the Unity clusters, you will find all your old storage here. |
Snapshots
Backups are not available on the Unity cluster. There are temporary snapshots created each day at 1am UTC. Snapshots older than three days are deleted. Self-directed restores are accomplished by accessing read-only snapshots (see table below).
| Filesystem | Name | Snapshot location |
|---|---|---|
/home/<username> | Home directory | /snapshots/home/unity_<timestamp>/<username> |
/work/pi_<pi-username> | Work directory | /snapshots/work/unity_<timestamp>/pi_<pi-username> |
Restore files from a snapshot
The following code sample shows how to restore a specific directory from a snapshot. The example restores to a restore directory first to ensure that changes aren’t overwritten.
mkdir ~/restore
cp -a /snapshot/home/unity_2023-02-08_01_00_00_UTC/<username>/path/to/file/or/directory ~/restore/