baChewie

I'm stubborn, so I had to figure this out myself. Wireshark showed: SMB2 131 Create Response, Error: STATUS_OBJECT_NAME_NOT_FOUND SMB2 131 Create Response, Error: STATUS_FILE_IS_A_DIRECTORY SMB2 131 GetInfo Response, Error: STATUS_ACCESS_DENIED SMB2 166 Lease Break Notification I thought it might be NTFS permissions, but even after re-applying security settings per DP's KB: https://wiki.covecube.com/StableBit_DrivePool_Q5510455 I still had issues. The timer is 30 seconds, adding 5 seconds for the SMB handshake collapse. It's the oplock break via the Lease Break Ack Timer. This MS KB helped: Cannot access shared files or folders on a drive in Windows Server 2012 or Windows Server 2012 R2 Per MS (above) to disable SMB2/3 leasing entirely, do this: REG ADD HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters /v DisableLeasing /t REG_DWORD /d 1 /f I didn't need to restart SMB2/3, the change was instant and file lookups and even a simple right-click in Explorer came up instantly. A process that took 8days+ finished in an hour or so Glad to be rid of this problem. Leases are disabled yes, but SMB oplock's are still available.

This is still an issue for me as well. I have two DP setups, both with Windows Srv 2016. One is affected (physical), and the other is not (vm). Drive speed on the affected system is 1GB/s+, all possible tweaks (above) have been tried, including disabling Opportunistic Locking, but each file transfer takes 35 seconds to begin, so imagine 10 files, each are 1MB... it takes literal minutes. Reducing the use of Drivepool for local use only, as this issue lies with SMB and Drivepool. There are no Server DFS issues on the affected system, R/W's on the disks are all 1000MB/s+ speed arrays. The delays are 35-seconds on-the-nose. This also happens to be the 'Lease Break Acknowledgment Time' default for SMB v2 in Windows. I hope a dev could have another look at this, the Oplock 35 second Lease Break timer is the only 35 second timeout I can find with SMB and Windows. Thanks!