I use 23.05, mr8300 routing, insert a USB flash drive into the usb3.0 interface, and when I pass in the 2g file, it says an error occurred, and unexpectedly I got a network error. Small files are no problem.
Is the drive formatted with a FAT filesystem?
If you plug the same drive directly into the computer that currently has the file, can you write it to the drive?
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The file system of the USB disk is exfat. There is no problem when plugging it into the computer. Moreover, I found that the copying speed on win10 is much faster than that on openwrt.
Does anyone know how to solve this problem？
any RAM warnings in the log?
Is it a USB drive issue or an issue of your network (Samba?) layer? e.g. what if you dd-create a large file on the drive directly via OpenWRT-SSH on the router? Or copy a large file from USB to USB via OpenWRT-SSH?
And you're not creating it in the root dir, are you ?
There are no warnings in the log.SSH can successfully transmit, but the speed is slow
it's /mnt/sda1
That doesn't answer the question...
yes of course
"yes of course" what ?
Not created in the root directory
And then？And then
Are you using samba4 or ksmbd? Any extra configs or the defaults?
samba4,According to the official website settings
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ksmbd and samba try to call truncate first before writing file. linux-exfat zero out hole range when truncating file. So truncate time is too long. So timeout happen at windows client. I will apply some patch to make truncate fast at exfat mainline. Need to wait more to apply it to mainline. Please use
temporarily the following out of tree exfat.
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See related discussion at samba tech mailing list.
https://lists.samba.org/archive/samba-technical/2020-December/136083.html
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or format the disk as ext4 
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Normally users use exfat or ntfs filesystem for usb storage. because exfat and ntfs is easily compatible with Windows. Recommending ext4 use for USB stick is not a solution.
but a workaround for certain