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The CUE directory naming structure is implemented to provide a sensible and common directory structure for centrally provided CUE directories and filesystems. When logged onto a CUE configured system the following directories are automatically mounted without any user intervention:
The home directory provides the user home directories that are available whether logged onto a Unix system or a Windows system. Disk quotas are implemented on the /home directory. The /home directory is backed up as part of regularly scheduled Computer Center backups.
The applications directory houses Computer Center provided applications (both commercial and public domain) for supported Unix and Windows systems. The /apps directory is backed up as part of regularly scheduled Computer Center backups.
Within CUE provisions are made to supply areas that are shared and accessible by individuals in groups that are assigned ownership of the directories. Disk quotas are implemented on the /group directory. The /group directory is backed up as part of regularly scheduled Computer Center backups.
These common group areas are set up for individual groups upon requests to the helpdesk when there is a justifiable need for the areas. When a request for a group area is made please include:
NOTE: If the group does not exist prior to the request for the group shared directory it will have to be created via a request to the helpdesk. When making the request for a new group please include the name of the new group and which usernames should be members of the group.
The site directory contains cross-platform utilities (/site/info contains information files of interest to users, etc.). The /site directory is backed up as part of regularly scheduled Computer Center backups.
The centrally available scratch filesystem is available to both Unix and Windows systems. This filesystem is not backed up, has no associated disk quotas, and is intended for temporary storage. Files in a users scratch directory that have not been accessed with 14 days are deleted. The check runs nightly.
The following directories are provided on all Scientific Computing systems. These directories are not available on most General Purpose Computing systems, or on Windows systems:
The directory structure for the Work directories is /work/{hall}/{experiment}. So a work disk area for experiment e98123 in Hall A would be /work/halla/e98123. Each Hall has been allocated a set amount of work disk space, which they manage and distribute among the experiments taking place in their Hall. Requests for work disk space or increased allocations of work disk space should be made to the individual in charge of computing for the Hall.. The /work directories are not backed up and should not be used to store source code or files that cannot be recreated.
The Cache directories are used to keep a limited mirror copy of the files under the MSS (/mss) directory tree available to users. User requests made with the jcache command determine what files are located on these disks. These disks are kept at close to 100% capacity at all times. The files on these disks are deleted using a least recently used algorithm when more space is required to fulfill new user request.
This document is maintained by {helpdesk@jlab.org}
Copyright Jefferson Lab 2007