iSCSI LUN Backup Using Synology NAS Over Internet - Slow Speeds
Posted on 2015-01-13
I am trying to get an off-site backup solution running for my company. I am using an iSCSI LUN on a Synology RackStation for data storage at my office, and I have another Synology RackStation at my home. The LUN is thin provisioned for 2TB, but we're currently only using ~25GB.
I opened up the required TCP ports on my home firewall (873 & 3260), setup the backup on the NAS at my office, and initiated the first backup. I have an upstream speed of ~8Mbps at my office, and downstream of 50Mbps at my home (both are business class connections), and the resource monitor of each NAS is showing ~1MB/s for the transfer speed, so it's correct. In theory, it should take a little over 7 hours to complete the backup.
After about 12 hours, I checked the status and only 6% was completed. I thought that maybe since the LUN is provisioned for 2TB, it was trying to transfer 2TB of data, but that would be over 120GB of data in 12 hours, and there's no way my connection could upload 10GB per hour. I checked the resource monitor, and it was transferring at about 20KB/s. I tested the network connections at my home and office, and both were fine. I decided to stop the transfer and try it again. It started out again at ~1MB/s, but after about 6 hours, it was back down to ~20KB/s.
I'm at a loss of what the problem could be. I am now about an hour into another attempt for the backup. It's still reading between 700KB/s and 1.3MB/s for the transfer speed, but the backup dialog on the NAS at my office is still says 0%. If it has been transferring at ~1MB/s for an hour, it should be somewhere around 14% completed.
Hopefully someone has some experience with Synology or LUN backups and can give me some insight. I am using a SonicWALL TZ 215 firewall at my office and an ASUS RT-AC87U at my home. Each RackStation has 2x 1GbE ports, which I have bonded and given a single static IP address.