Samba Slow – Oplock break failed for file
Oplock break failed – Slow copying of files in Samba
If you are facing sluggishness in copying files to your samba drive, there is a good chance that, it may be because the error “Oplock break failed for file” in your /var/log/syslog(Ubuntu) and /var/log/messages(In other linux distributions)
Jan 07 11:31:27 machinename smbd[3641]: Oplock break failed for file filename.txt
To resolve this, you may need to add the below entries to the [global] section of your smb.conf(/etc/samba/smb.conf)
[global] ....... ....... kernel oplocks = no nt acl support = no strict locking = no
Then add the below entries under [your share name] section of smb.conf
[your share name] ........ ........ oplocks = no share modes = no locking = no acl check permissions = false level2 oplocks = no strict locking = no blocking locks = no