The Lustre Scratch filesystem, /lustre/scratch, provides an initial allocation of 20TB of disk space and 5Million file and directory entries, i.e. inodes. The Lustre scratch filesystem is designed for high-performance temporary storage of data.
- Lustre is scratch space, it is NOT BACKED UP, a failure of only one component of the Lustre filesystem could result in data loss.
- Lustre Scratch is subject to a 60 DAY PURGE POLICY. Data older than 60 DAYS WILL BE DELETED automatically from the Lustre Scratch filesystem.
- Data results you wish to keep should be post-processed and/or moved to the long-term filesystem, /nfs/long, which is a redundant, backed-up filesystem.
- The long-term filesystem utilizes a redundant 10GbE link to all login systems to make migration of data as fast as possible. Long-term is also housed in a separate, physically segregated, data center with backup power generation to make storage of your data as safe as possible.
- If your scratch data consists of millions of files and directories, we ask that you compress this data using tar when moving it to long-term storage. This reduces your overall file count in the long-term filesystem and also allows for optimal performance of our backup process. Users can tar directly from Lustre Scratch to long-term on their login node, tar without compression is recommended, e.g. tar cf /nfs/long/1/username/data.tar /lustre/scratch/username/scratch_data, replacing “1” and “username” with your login node number and username.