Home Directories
Each user is provided a home directory to store frequently used items such as source code, binaries, and scripts. Home directories are located in a Network File Service (NFS) that is accessible from all NCCS resources as
/ccs/home/$USER
Please Note:
All NCCS systems will be unavailable from 05:00 until 17:00 (ET) on September 08, 2007. During the outage, data currently stored under the shared /spin
directory will be moved to a new location. This move is an effort to better accommodate the disk needs of our users. In addition to the file-system move, the default home directory quota will be increased from 500 MB to 2 GB during the outage.
As a result of the file-system move, all references to /spin
and /autofs/spin
should be modified. The following paths will be affected by the move:
/spin/home /spin/proj /spin/apps /autofs/spin/home /autofs/spin/proj /autofs/spin/apps
In an effort to aid in this and any future moves, a directory, /ccs
, has been created. The /ccs
directory contains links that will always point to the correct underlying directory. Users are encouraged to replace any /spin
or /autofs/spin
references with /ccs
.
The following paths should be used at this time:
/ccs/home /ccs/proj /ccs/apps
Also note, the environment variable $HOME
will always point to your current home directory. It is recommended, where possible, that you use this variable to reference your home directory. In cases in which using $HOME
is not feasible, it is recommended that you use /ccs/home/$USER
.
Because the NFS servers are outside each NCCS HPC system, NFS does not provide the highest performance.
Each user has a default storage limit of 500 MB in his or her home directory. To request an increased quota, please submit the special request form for review.
In addition to the .yesterday
backup described below, home directories in NFS are copied to tape backup four times a week.
To find your quota and usage in NFS, use the quota
command or lsquota
utility:
> quota -Qs Disk quotas for user usrid (uid 12345): Filesystem blocks quota limit grace files quota limit grace nccsfiler1a.ccs.ornl.gov:/vol/home 4858M 5000M 5000M 29379 4295m 4295m >
where
blocks
is the current usage andquota
is the current quota.
Each home directory has a default set of subdirectories.
- private
- This directory is accessible only by the user.
- .yesterday
- This directory contains a read-only copy of the rest of the home directory, including other subdirectories, as of the day before. The copy is generated at 4 a.m. each morning. If you accidentally delete any of your NFS files, you can simply copy versions from the day before out of
.yesterday
. You cannot directly create or remove files from the.yesterday
directory. - www
- Documents kept in this directory can be made available over the World Wide Web provided the permissions allow readability. Please contact the UAC to arrange for this directory to be accessible over the web.