Not enough free space, you are uploading xxx KB but only 0 B is left

Hi
Recently i tried to upload any file, it always shows error “Not enough free space, you are uploading xxx KB but only 0 B is left”.

2 days ago I still can upload file, but today i cannot.
I checked my quota is unlimited, I tried to create some new users, but still getting the same error.

I check my Operating System, still 2% usage
(nb : owncloud data is stored in /ocdata) see below

owncloud

any suggestion ?
Thank you

Steps to reproduce

Expected behaviour

I can upload file to owncloud

Actual behaviour

Getting error “Not enough free space, you are uploading xxx KB but only 0 B is left”

Server configuration

Operating system: Centos 7.5

Web server: Apache/2.4.6

Database: MySQL 5.7

PHP version: PHP 7.2

ownCloud version: (see ownCloud admin page) 10.0.10

Updated from an older ownCloud or fresh install: Fresh Install

Where did you install ownCloud from: From owncloud.org

Signing status (ownCloud 9.0 and above):

No errors have been found.

The content of config/config.php:

'trusted_domains' =>
  array (
    0 => 'xxxx'
  ),
  'datadirectory' => '/ocdata/',
  'overwrite.cli.url' => 'http://'
  'dbtype' => 'mysql',
  'version' => '10.0.10.4',
  'dbname' => 'ocdb',
  'dbhost' => ''
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => ''
  'dbpassword' => ''
  'logtimezone' => 'UTC',
  'installed' => true,

List of activated apps:

If you have access to your command line run e.g.:
sudo -u www-data php occ app:list
from within your ownCloud installation folder.

Are you using external storage, if yes which one: YES, I am using NFS for data

Are you using encryption: no

Are you using an external user-backend, if yes which one: no

Hey,

could it be possible that your system doesn’t allow ownCloud/PHP accessing the mountpoint?