NFS Disks Cray

Home, Scratch, and Temporary Disks

The Unix Cluster has many storage locations for files of varying priority:

• Home disks should be used primarily for your important files and source code. Back-ups are done nightly for home disks and kept for a few months---if ever you lose a file, there is a good chance it can be recovered if it was in your home directory. However, NO ARCHIVING is available for files. In addition, there is also a quota set on the memory available for individual use (set at a default of 5 MB, but easily changed). To store a large file indefinitely, it should either be saved in CFS (storage facility in Berkeley) or put it on tape (available for only five dollars). To find out what your quota is and how much memory is already in use, type /usr/local/bin/quota -v.
• Scratch disks are the next level down from home disks in priority. Unlike home disks, there is no quota on how much memory alotted to each user; however, scratch disks are only backed up on a weekly basis and all contents are purged every 60 days. As with home disks, scratch disks are shared between machines, so you can access your files on a scratch disk no matter which computer you're on. Scratch disks are also referred to as `/scratch1', `/scratch2', etc.
• Temporary disks are for, you guessed it, temporary files of low priority. As with scratch disks, there is no quota on memory. NO BACK-UPS are made for temporary disks, and all contents are purged every 30 days. Top-level files are purged with every new login session. An important thing to note is that the `/tmp' temporary disk is NOT shared between machines. The temporary disks that is shared between machines is `/gtmp'.

NFS

Disks

Cray