Remote sync extremely slow

Colin 't Hart

Renowned Member
Jan 20, 2017
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Frösön, Sweden
hiawathaavenue.com
Hi,

We're wanting to replace a somewhat home-grown backup solution based on rsnapshot and rsync with Proxmox Backup Server. The rsnapshot solution uses rsync to mirror the backups to other servers, including one off-site.

I have Proxmox Backup Server configured as a remote but it's syncing extremely slowly. It has transferred 30MB in the last day or so; my backups are only about 400GB at present, expecting to go up to close to 4TB. This is more than we have at present since we can now backup entire VMs whereas the current solution only backs up the actual data.

CPU usage during syncing is extremely low, hovering at around 25% of one core. As far as I can tell I have not enabled any throttling, encryption, compression.

I there any difference in speed between push and pull?

Why is this syncing so much slower than rsync on identical hardware?
 
There is a speed limit in the job settings but it defaults to none/off.

Our speeds jumped notably when enabling FQ Codel on the connection even though it was syncing overnight. Do you by chance have a limiter in your router at either end?