Windows UI and Explorer freezing during rclone sync

I have been experiencing a problem with Windows UI and Windows Explorer freezing. It ONLY occurs when I start an rclone sync. It also causes RDP sessions to fail to connect. The machine is actually a new Google Cloud VM running Windows Server 2016 and SQL Server 2016. The VM was configured with 96 vCPUs ( AMD EPYC Rome), 768 GB RAM and 5 TB of SSD storage drive, so resources should not be a problem. Plus, there was no DB activity as I was copying the 2TB backup file to set it up.

This is the command I was running. It is a windows share to local drive sync. The basic config is shown below. I was using version 1.55.1 (and 1.55.0), both cause same behaviour. Do you see anything in config or parameters that would cause a problem?

C:\rclone\rclone.exe --config C:\rclone\rclone_gcp.conf sync 
                     --delete-during --verbose --copy-links 
                     --buffer-size=256M --transfers 5 --checkers 4 
                     --multi-thread-cutoff 200M --multi-thread-streams 10 
                     --contimeout 60s --timeout 300s --retries 3 
                     --low-level-retries 10 --log-file $logfile --stats 5m  
                     filestore:\\dr-sql\backup\DR-SQL  filestore:\\localhost\d$\backup\DR-SQL

rclone Version

C:\rclone>rclone --version
rclone v1.55.1

  • os/type: windows
  • os/arch: amd64
  • go/version: go1.16.3
  • go/linking: dynamic
  • go/tags: cmount

rclone Config

[filestore]
type = local
nounc = false
copy_links = false
links = false
skip_links = false
zero_size_links = false
no_unicode_normalization = false
no_check_updated = false
one_file_system = false
case_sensitive = false
case_insensitive = false

Windows Server Details

OS Name: Microsoft Windows Server 2016 Datacenter
OS Version: 10.0.14393 N/A Build 14393
OS Manufacturer: Microsoft Corporation
OS Configuration: Member Server
OS Build Type: Multiprocessor Free
Registered Owner: N/A
Registered Organization: N/A
Product ID: 00376-40000-00000-AA947
Original Install Date: 3/5/2021, 4:12:21 PM
System Boot Time: 5/29/2021, 10:53:49 AM
System Manufacturer: Google
System Model: Google Compute Engine
System Type: x64-based PC
Processor(s): 1 Processor(s) Installed.
[01]: AMD64 Family 23 Model 49 Stepping 0 AuthenticAMD ~2250 Mhz
BIOS Version: Google Google, 1/1/2011
Windows Directory: C:\Windows
System Directory: C:\Windows\system32
Boot Device: \Device\HarddiskVolume3
System Locale: en-us;English (United States)
Input Locale: en-us;English (United States)
Time Zone: (UTC-05:00) Eastern Time (US & Canada)
Hotfix(s): 10 Hotfix(s) Installed.
[01]: KB5001841
[02]: KB4049065
[03]: KB4486129
[04]: KB4524244
[05]: KB4535680
[06]: KB4562561
[07]: KB4589210
[08]: KB5001078
[09]: KB5001402
[10]: KB5003197
Network Card(s): 1 NIC(s) Installed.
[01]: Google VirtIO Ethernet Adapter
Connection Name: Ethernet
DHCP Enabled: No
IP address(es)
[01]: 10.xx.xx.xx
[02]: fe80::ed3f:xxxx:xxxx:xxxx
Hyper-V Requirements: A hypervisor has been detected. Features required for Hyper-V will not be displayed.

hi,

as this is a new virtual server, i would do some tesing without rclone.
it could be a server issue, not a rclone issue

for what it is worth, i have never used rclone for local and never would.
if you are looking for an app for local to local, try fastcopy, i have been using it for over 10 years.

as for your command, start with as few flags as possible, using defaults.
for each run, track the total time
add/change flags and track the total time.

for a start, i would remove
--multi-thread-cutoff 200M
--multi-thread-streams 10

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