Hi! I have a problem with a sftp server, just a day it failed!

User "compliance"

When I enter vía sftp with my user it´s ok, but in my directory I can´t create anything, it´s not because of permissions, only "failure create a file". I noticed that my disk is full 100% used, but my question is, when I login with root user in the same directory I can create everything I want, so why? is it not about of free space? why with another user I can´t!

I was looking for some information and I found about "quota users", but with df -h command this "compliance" user has space, so I think is not the problem.

Any ideas please?

I repeat it, it´s not about of permissions, everything is ok with this and I was working ok, just one day it failed.

Thank you!

Welcome to LinuxQuestions.

Without knowing what distribution you are running I would guess the filesystem in use is ext4. By default when an ext4 filesystem is created it reserves 5% of the total space for root which is why it can create files but your regular user can not. Reserved space allow root to login and access the filesystem and also prevent fragmentation.

You can reduce the amount of reserved space but do not go to zero or you will not be able to login. Delete some files if you can but you need to delete the space needed to go below 95% to see some available space.