Error executing backup

[FSNaval]

good day all,

today when trying to execute my scheduled backup, i received the following error:

""ERROR: Backup of VM 100 failed - VM 100 qmp command 'backup' failed - backup connect failed: command error: unable to read "/mnt/datastore/backup1/vm/100/owner" - Input/output error (os error 5)""

i tried googling it, but i received noresults. Can someone explain what is the reason and, if possible, guide on how to solve it?

Previous backup has been executed without errors.

 

[waltar]

That looks like a hw error.
df ?
mount|grep datastore ?
ls -l /mnt/datastore/backup1/vm/100 ?