Issue Error with backup

[CobraArbok]

In Backup Manger I see:
The backup Aug 23, 2018 05:47 PM was created and can be restored, although some minor issues occurred.

In The log, I see:

WARNING:      (mysql object 'admin_gsasit2')      Not all the data was backed up into /var/lib/psa/dumps/domains/sommaruga.online/databases/admin_gsasit2_1 successfully.
Total space: 155.00 GB; Available space: 130.00 GB; Mounted on: /.
mysqldump: Got error: 23: Out of resources when opening file './admin_gsasit2/glpi_plugin_accounts_aeskeys.MYD' (Errcode: 24 - Too many open files) when using LOCK TABLES

it would seem that the disk is full, but in Server Healt the space occupied is 17GB

Thanks in advance for any advice

 

[Monty]

Plesk or website does not work: Unable to connect to database MySQL server has gone away: Full server backup is created with warning: errno: 24 - Too many open files