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Dynamic AFS quotas

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Every user of Informatics AFS filespace gets a maximum AFS quota. See AFS Quotas for a list of the current default quota for various groups of users, and how to check your own quota and usage. However to make better use of our available disk space, we do not give everyone their maximum quota all at once. We grow their actual quota as their disk usage increases.

For example, assume an AFS maximum student quota of 5GB and current quota of 3GB - then if a student is currently only using 1.5GB of data, their AFS quota is 3GB. As their usage increases to a point within 600MB of their current usage AFS quota, then it will automatically be increased by another 1GB, so in this case to 4GB. And so on until they reach their maximum AFS quota of 5GB.

As mentioned, this gives us the benefit of being able to make better use of our disk space, but it can lead to problems if a new user reads they have a quota of 5GB, and (starting with no files) tries to copy 4GB from a pen drive into their home directory. In this case they'll only be able to copy the first 1GB, as they'll hit their current AFS quota (1GB is the minimum quota). The automatic increase check runs hourly, so they could have to wait up to an hour before their quota is increased to 2GB, and so on until they get to the 5GB maximum limit.

If anyone knows that they need to create a large amount of data in one go, then they should ask (via the Support Form) for their dynamic quota to be increased to the maximum value.

Tools like freespace and fs listquota ... show you your current AFS quota, which may be less than the maximum quota that you're entitled to.

Last reviewed: 
10/05/2017

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