11. File System Overview


This page is intended to offer an overview of the filesystems on the Bohrg and Dominion clusters which are of interest to users. More information is available on the pages below (Home Directories, Scratch Space and Software).

11.1. Hardware/Disks

The "core" storage on Bohrg and Dominion is based around an array of SCSI disks which is physically attached to storage, the head/submit node for Bohrg.

In addition, each node contains 1 or 2 internal disks.

11.2. Central Filesystems

The following filesystems live on the central SCSI disk and are automounted on dominion1 (head/submit node for Dominion) and on all the compute nodes (on both clusters):

    /home/bohrg/<username>
    /scratch/bohrg/<username>
    /software/bohrg/<application>
These are, respectively, users' home directories, users' central scratch space and the applications available, such as Gaussian and the PGI compilers.

11.3. Local Filesystems

On each node, spare disk space has been allocated as scratch space. Currently this is accessible as

    /tmp               # Bohrg compute nodes
    /local_scratch     # Dominion compute nodes
A naming convention which will apply across all nodes will hopefully be worked out soon!

11.4. Automounted Filesystems

All filesystems which live on the central SCSI disk are automounted to make them available to users. This means that they are mounted on demand and if they are not used for a specified time they are unmounted.

11.5. Automounted Filesystems --- A Warning

The automounter can cause confusion. Here is an example:

    bohrg> cd /software
    bohrg> ls -a
        .  .. 
    bohrg> cd bohrg                      # or cd ./bohrg
    bohrg> ls -a
        amber  gaussian...
Automounted directories are mounted on demand --- listing the parent directory does not count as demand!

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