Disk usage on the cluster is restricted by quotas at the group level for all groups. Some groups may also enforce quotas at the level of individual users. In addition to limitations on space usage, the number of files you can create may be restricted. If you exceed either the space quota or the file number quota, you will be unable to create new files or extend existing ones.

If a group's usage exceeds its quota then members of the group will be unable to create more files until the group's usage has been reduced below the quota.

The usage and quota for a given group is available by running

/usr/local/bin/showquota --group GROUPNAME

on nanna. Adding the –group-users option will also display information for individual users in the group.

Users can view their disk usage and quotas by running

/usr/local/bin/showquota

Do not use df -h as a guide to available storage.

df measures storage across the entire filesystem. The total amount of free storage on the system is not an accurate guide to the amount of free storage available to your group.

Try to get into the habit of thinking about how much storage a task will require, especially if it is a large array job. Running out of storage can be disruptive to the entire group, not just individual users.