Extremely slow local backup

Support
#1

Hi,
I’m running an initial backup from my OS X computer to a local Synology and the transfer speed is incredibly slow (around 7mb/s). Is this a known/unknown issue or is this expected?
Thanks a lot!

#2

Did you mean 7M bits/s? If so, it is a bit slow. You can try to increase the number of threads to 2 or 4, but please also make sure that the network or the NAS disk isn’t the bottleneck.

#3

Sorry I meant MB/s, I always get mixed up with the speeds :slight_smile:
I thought that for local it was better to use one thread?

#4

7MB/s isn’t too bad. The one thread recommendation is for local disks only (not over a network). I don’t know for sure if 2 threads would help, but you can try it with a single file like 1GB in size to see if there is any inprovement.

#5

Thank you for your answer.
How comes this isn’t too bad? Is it because of the way backups are split in thousands of files?

#6

What is the upload speed if you scp a large file to your NAS?

#7

Ok, i can confirm that the nas is being the bottleneck here.
My usual speed is 50MB/s but it looks like the Synology (DS716+) is unable to handle the big number of chunks optimally.
Starting a backup on a local USB drive, I get 130MB/s at the beginning and then it gradually decrease to around 30-40MB/s which is acceptable.

#8

I’m running an initial backup from my OS X computer to a local Synology and the transfer speed is incredibly slow (around 7mb/s)

This is rather unusual. What protocol are you using? SFTP? SMB?

I backup from an iMac via SFTP (with encryption turned on) to DS918+ and get over 45MB/sec speeds on large files; and the bottleneck is not a synology but iMac.

Looking at the number of files in the duplicacy destination:

saspus@mynas:/volume1/Backups/duplicacy$ find . |wc -l
155679
#9

I’m using SMB and I’m on a Gb LAN.

#10

Now the recommended way to identify bottlenecks is to the benchmark command implemented by https://github.com/gilbertchen/duplicacy/pull/449.

1 Like
#11

Have you tried disabling packet signing? Any effect?

What is CPU utilization on the host and target during write? What is disk queue length on the destination?