At the time of writing main storage consists of three shared volumes: the home volume (11TB) and two scratch volumes (172TB each). These are all Lustre filesystems. Home directories have a 40 GB quota enforced per user and the scratch storage is partly owned by contributing research projects.
In addition each compute node has a modest amount of temporary storage available during the lifetime of each job: on local disk under /local, and in virtual memory under /ramdisks. The contents of these directories are destroyed after job completion.