Slow copy to USB from RAID5 in TNAS

[thedutchmans]

I have 4 3TB Hitachi HGST 7200 RPM disks, configured in RAID5. I have a 4TB USB3 disk, formatted NTFS, attached to the TNAS. In SSH, I'm trying to rsync a folder from the RAID5 volume to the USB3 disk. Total number of files is around 10,000. Total amount of data is under 4TB. Copies to the USB3 disk max out at 30MB/s. I don't have ClamAV installed on the TNAS. Why is the file transfer so slow?

[TMSupport]

Please advise your TNAS model number and current TOS version. Did you use USB Copy to transfer the files?

[thedutchmans]

Sorry, I thought I mentioned that it is a F4-210. Per my post, I did not use USB Transfer- I connected to the NAS over SSH, then used RSYNC to copy from the NAS to a USB 3 disk.

[TMSupport]

Please test the speed of a single big file using SSH, also please test with command cp to see what speed could you get.
The speed would be about 30 MB/s when transferring a huge amount of small files.

[thedutchmans]

Of the 10,000 files I was copying, 98% of them are over 1.5GB.

[TMSupport]

We will test the speed according to your description and get back to you when the result is confirmed.