Local scratch and temporary storage

Each node offers two local filesystems intended to help programs which need higher-speed I/O than NFS can offer.

/tmp: /tmp is available on each node, purely as temporary storage. The size of /tmp space can vary on nodes, from 500 MB to 1 GB. /tmp is cleaned on nodes at each reboot, and nightly, so be sure not to leave anything in /tmp.

/scratch: /scratch is essentially a much larger /tmp filesystem. /scratch is not cleaned at reboots, instead, data can potentially remain on a /scratch space until it's not been accessed for 14 days. /scratch filesystems are much larger than /tmp, to the order of 20-30 GB.

Do not leave data in /scratch directories that you cannot lose!!!