[SOLVED] Ext HD USB 3.0 --> UNRAID SATA HDD = 30MB/s only??

[theunraidhomeuser]

Hi everyone, I know this has been asked a couple of times, but I am still not sure I get it. I used to have an UBUNTU 18.04 LTS server with manually configured SMB shares, Webmin etc. I now moved to UNRAID (today). 

 

My NAS is an AMD Ryzen 3rd Gen 5 3500 CPU, 32GB RAM and ASUS ROG B450-I motherboard, 2 x brand new 14TB IronWolf SATA drives, 1 (fast!) NVMe 512GB

 

Before moving to UNRAID, I backed up my data in Ubuntu to the external USB 3 drives (I use the ORICO SATA 3.0 HDD Docking Station). Transfer speeds for large files were around 220 MB/s on EXT4 format.

 

Now, I am mounting the same drives with the same external dock and I am getting around 32 MB/s... I saw some people in the forum saying "that's normal, overhead, array, etc.", however my array is essentially "RAID0", no parity disk.

 

Q1: why is this? Is this a caching issue? My thought would have been that using the SSD cache would speed up things. Am I wrong?

Q2: how can I restore my data at 200 MB/s to avoid spending weeks?

 

Thanks!

Edited April 25, 2020 by theunraidhomeuser

[JorgeB]

If there's no parity the problem is likely with the USB enclosure, it might not be linked at USB 3.0, test transferring from your desktop to the array.

[theunraidhomeuser]

Hi Johnnie, it's the same enclosure, port and physical machine I used under Ubuntu. Literally nothing changed other than the speed.

From the desktop to the array would mean over the network, and that of course will be a lot slower..? don't quite understand that?

[JorgeB]

9 minutes ago, theunraidhomeuser said:

From the desktop to the array would mean over the network, and that of course will be a lot slower..?

Why would it be slower? Are using 100Mbit or Wifi?

[theunraidhomeuser]

because (per my original post), I am discussing and USB 3.0 connection straight to the UNRAID machine, nothing to do with the network..

[JorgeB]

Testing the speed using the network would rule out an enclosure issue, or confirm an array problem, either way it would be an easy thing to do.

[theunraidhomeuser]

Sorry if I'm being thick, maybe I have a fundamental misunderstanding of what you are trying to say. 

 

My challenge: [USB 3.0 HARD DRIVE ]-----usb 3.0 cable-----[UNRAID SERVER]

 

You are proposing: [Desktop]----1Gbit Ethernet----[UNRAID SERVER]

 

Correct? How does one relate to the other? I am talking about previous speed of 220 Megabytes per second, not MBit/s...

Network transfer between my Desktop and the UNRAID PC is "normal" as would be expected on a 1GBit network..

 

[JorgeB]

1 minute ago, theunraidhomeuser said:

How does one relate to the other?

Gigabit network transfer should give you around 110MB/s, if you get that it points to an enclosure issue, if you get the same 30MB/s it's likely an array issue, it gives us an idea where to start looking for the problem.

[theunraidhomeuser]

oh man... I think I found out what the issue was... my RSYNC was using compression to restore.... That brought the speed down so much... without the -z flag, it's now as fast as it should be!!! Thanks for your help and support, I'll mark this as resolved!

Edited April 25, 2020 by theunraidhomeuser

[JorgeB]

So the enclosure is likely the problem.

[JorgeB]

It can also be the rsync command, e.g. if it's using compression, but that's unlikely assuming you're using the same as before.

 

 

[theunraidhomeuser]

2 minutes ago, johnnie.black said:

It can also be the rsync command, e.g. if it's using compression, but that's unlike assuming you're using the same as before.

you were spot on.... I changed the RSYNC command (went by memory that was my mistake)

[JorgeB]

Good you found the issue, if you don't mind I'm going to tag it solve.

 

Edit: I see you already did it.