If you have a ReadyNAS Ultra you may want to disable quotas in order to eliminate some issues. I’ve experienced issues myself where CIFS copies would fail due to the filesystem being out of space even though quotas are set insanely high and the ReadyNAS interface is reporting plenty of space left on the device. Often there are no needs for the quotas and the easiest thing is to simply remove them altogether.
Removing quotas in ReadyNAS (RAIDiator) is actually pretty easy but you have to know where to go and be confident that you are not going to break anything. The filesystem data is kept in the /etc/fstab file. The /c mount is the one about which we are concerned. This is the mount that is used for our NAS shares. In /etc/fstab it should look like this:
/dev/c/c /c ext4 defaults,acl,user_xattr,usrjquota=aquota.user, grpjquota=aquota.group,jqfmt=vfsv1,noatime,nodiratime 0 2
All we need to do is to edit that line to remove the three arguments that refer to the quote. For safety, make a copy of the original line before making any edits so that you can easily put it back exactly as it was. The modified line will look like this:
/dev/c/c /c ext4 defaults,acl,user_xattr,noatime,nodiratime 0 2
Simply reboot and, if all is well, you will no longer have to put up with quotas and previously failing file copies will now work smoothly.