If you are recieving an error like the following when trying to uplaod files via ftp with pure-ftp then you can use the following steps to correct the issue:

ftp> put install-x86-universal-2005.1.iso
local: install-x86-universal-2005.1.iso remote: install-x86-universal-2005.1.iso
227 Entering Passive Mode (67,19,61,94,232,67)
553 Disk full - please upload later  

PureFTPd defaults at 90% usage being considered full. You can change this in the /etc/pure-ftpd.conf file. Just search for "90" and change it to like "98".

Once you have made the change to the conf file you will need to restart pure-ftp:

 [~]# /etc/init.d/pure-ftpd restart
Stopping pure-config.pl:
Stopping pure-authd:
Starting pure-config.pl:                                   [  OK  ]
Starting pure-authd: