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Frequently Asked Questions: Difference between revisions
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If you are the owner of the files, you can run the <code>chgrp</code> command to change their group ownership to the appropriate project group. To ask us to change the group owner for several users, contact [[Technical Support|technical support]]. | If you are the owner of the files, you can run the <code>chgrp</code> command to change their group ownership to the appropriate project group. To ask us to change the group owner for several users, contact [[Technical Support|technical support]]. | ||
You can also use the command <tt>chmod g+s <directory name></tt> to ensure that files created in that directory will inherit the directory's group membership. | You can also use the command <tt>chmod g+s <directory name></tt> to ensure that files created in that directory will inherit the directory's group membership. | ||
=== Another explanation === | |||
Each file in Linux belongs to a person and a group at the same time. | |||
By default, a file you create belongs to you, user “username", and your group, named the | |||
same “username". That is it is owned by “username:username". | |||
You group is created at the same time your account was created and you are the only user | |||
in that group. | |||
This file ownership is good for your home directory, or the scratch space. | |||
See the "Home" and "Scratch" lines in the output: | |||
<pre> | |||
Description Space # of files | |||
Home (user username) 15G/53G 74k/500k | |||
Scratch (user username) 1522G/100T 65k/1000k | |||
Project (group username) 34G/2048k 330/2048 | |||
Project (group def-professor) 28k/1000G 9/500k | |||
</pre> | |||
The quota is set for these for a user “username". | |||
The other two lines are set for groups “username" and “def-professor" in Project space. | |||
It is not important what users own the files in that space, but the group the files belong | |||
to determines the quota limit. | |||
You see, that files that are owned by “username" group (your default group) have very small | |||
limit in the project space, only 2MB, and you already have 34 GB of data that is owned by | |||
your group (your files). This is why you cannot write more data there. Because you are | |||
trying to place data there owned by a group that has very little allocation there. | |||
The allocation for the group “def-professor", your professor's group, on the other hand does | |||
not use almost any space and has 1 TB limit. The files that can be put there should have | |||
“username:def-professor" ownership. | |||
Now, depending on how you copy you files, what software you use, that software either will | |||
respect the ownership of the directory and apply the correct group, or it may insist on | |||
retaining the ownership of the source data. In the latter case you have the problem like | |||
you have. | |||
Most probably your original data belongs to “username:username", properly, upon moving it, | |||
it should belong to “username:def-professor", but you software probably insists on keeping | |||
the original ownership and this causes the problem. | |||
If you already have data in your project directory with wrong ownership, you can correct this with | |||
commands: | |||
<pre> | |||
$ cd project/$USER | |||
$ chown -R username:def-professor data_dir | |||
</pre> | |||
This will correct the ownership of the files inside '''data_dir''' directory in your project space. | |||
You can read more about the problem here: | |||
https://docs.computecanada.ca/wiki/Frequently_Asked_Questions#Disk_quota_exceeded_error_on_.2Fproject_filesystems | |||
=== Finding files with the wrong group ownership === <!--T:18--> | === Finding files with the wrong group ownership === <!--T:18--> | ||