Snapshots on NIRD

Both home directories (/nird/home/$USER) and all project areas in NIRD Data Peak (/nird/datapeak/NSxxxxK) and NIRD Data Lake (/nird/datalake/NSxxxxK) have temporary, point-in-time copy of data in the form of snapshots.

Snapshots are taken with the following frequencies:

• /nird/home/$USER:

  • daily snapshots for the last 7 days

  • weekly snapshots for the last 6 weeks

• /nird/datapeak/NSxxxxK:

  • daily snapshots for the last 7 days

  • weekly snapshots for the last 6 weeks

• /nird/datalake/NSxxxxK:

  • daily snapshots for the last 7 days

  • weekly snapshots for the last 6 weeks

Warning

Kindly note that snapshots are temporary and if the datasets needs higher level of security in the form of backup on a secondary storage, project leaders must use the NIRD Backup.

Where the snapshots are located

The NIRD $HOME and NS project snapshots are available under:

• /nird/home/.snapshots

• /nird/datapeak/NSxxxxK/.snapshots

• /nird/datalake/NSxxxxK/.snapshots

A deleted/overwritten file in the home directory on NIRD can be recovered like this:

$ cp /nird/home/.snapshots/DATE/$USER/mydir/myfile /nird/home/$USER/mydir/

Note that snapshots are taken every night only. This means that deleted files which did not exist yet yesterday cannot be recovered from snapshots.

To recover a deleted or overwritten file in NIRD Data Peak /nird/datapeak/NSxxxxK/dataset1/myfile, you can copy a snapshot back to the folder and restore the deleted/overwritten file like this::

$ cp /nird/datapeak/NSxxxxK/.snapshots/DATE/dataset1/myfile /nird/datapeak/NSxxxxK/dataset1/

To recover a deleted or overwritten file in NIRD Data Lake /nird/datalake/NSxxxxK/dataset1/myfile, you can copy a snapshot back to the folder and restore the deleted/overwritten file like this:

$ cp /nird/projects/NSxxxxK/.snapshots/DATE/dataset1/myfile /nird/projects/NSxxxxK/dataset1/

Select the DATE accordingly to your case.