Large files sent through Syncthing have very slow reads from disks?

[lfam (lf)]

Syncthing transfers files in chunks, in a random order. If you are using spinning disks, the resulting fragmentation will be quite annoying.

I don’t have experience with XFS, but it seems like there are tools for measuring fragmentation, and for defragmenting (found with google):

How To Defragment An XFS File System

Relevant prior discussion with some advice:

Slow sync with large files

I am having a little problem with Syncthing. My setup is the following. 2* Windows Server 2012R2 Syncthing v0.14.47 connected via OpenVPN ~12 Mbit/s I use Syncthing to sync backups which are made with Veeam Endpoint Backup. Veeam does incremental backups. Each day there are a few gigabytes that get put into a new file and the oldest incremental is integrated into the first backup file. The new file poses no problem and gets synced reasonable fast. The trouble is with the large first backup fil…