Slow xfer with rsync + CIFS

[cstanley]

Hello!

I have noticed something perplexing when transferring large files over to my NAS using the CIFS protocol and rsync.

When I first initialize my transfer with rsync, it times out for a minute or so before it picks up and starts going 10x SLOWER than it should.

EXAMPLE:

cstanley@dell:~$ sudo mount -t cifs //X.X.X.X/backups /home/cstanley/backups
cstanley@dell:~$ sudo rsync -r --progress dash/ backups/cameras/dashcam/LoopREC/00001/
sending incremental file list
201801120808_000387AA.MP4
32,768 0% 89.39kB/s 0:03:54 ^C <----HANGS for 1 minute before resuming at about 20MB/s

It shows the speed at 89.39 KB/s, however I can check and see that there is actually no I/O present during this hang.

In an attempt to understand the situation more, I ran the same command, but this time bypassing the CIFS share and going directly to the pool over SSH

EXAMPLE:

Code:

cstanley@dell:~$ sudo rsync -r --progress -e 'ssh' dash/ root@X.X.X.X:/mnt/zfsp1/backups/cameras/dashcam/LoopREC/00001/
sending incremental file list
201801120758_000386AA.MP4
	419,430,400 100%  239.51MB/s	0:00:01 (xfr#1, to-chk=319/347)
201801120808_000387AA.MP4
	 20,971,520 100%   202.96MB/s	0:00:00 (xfr#2, to-chk=318/347)
201801120809_000389AA.MP4
	230,686,720 100%  209.28MB/s	0:00:02 (xfr#3, to-chk=317/347)

As you can see, the speeds here are much faster, and there is no lag between files.

Not seeing anything related in some of the logs I checked. Any ideas or suggestions?

BUILD: FreeNAS-11.1-U2

 

[dlavigne]

Were you able to figure this out?