[SOLVED] Really slow (50 MB/s) transfer speed between disks on UnRaid - Even with parity turned off

[JorgeB]

iperf3 -c server_IP -R

 

[Cyaankali]

1 hour ago, JorgeB said:

iperf3 -c server_IP -R

 

 

[  4]   0.00-1.00   sec   113 MBytes   951 Mbits/sec
[  4]   1.00-2.00   sec   113 MBytes   945 Mbits/sec
[  4]   2.00-3.00   sec   113 MBytes   949 Mbits/sec
[  4]   3.00-4.00   sec   113 MBytes   948 Mbits/sec
[  4]   4.00-5.00   sec   113 MBytes   947 Mbits/sec
[  4]   5.00-6.00   sec   113 MBytes   946 Mbits/sec
[  4]   6.00-7.00   sec   113 MBytes   948 Mbits/sec
[  4]   7.00-8.00   sec   113 MBytes   945 Mbits/sec
[  4]   8.00-9.00   sec   113 MBytes   947 Mbits/sec
[  4]   9.00-10.00  sec   109 MBytes   918 Mbits/sec

Except from that the problem still exist with a maximum transfer speed between 50mb/s & 60mb/s when i am transfering data between my pc and the server.

Edited March 11, 2023 by Cyaankali

[JorgeB]

And the source is fast? From what I've seen so far looks more like source problems, do you have a different computer you can test with? Also run a diskspeed docker read test to confirm disks and controller are performing as expected.

[Cyaankali]

2 hours ago, JorgeB said:

And the source is fast? From what I've seen so far looks more like source problems, do you have a different computer you can test with? Also run a diskspeed docker read test to confirm disks and controller are performing as expected.

I don't have another pc to test this particular problem.  The files that i mostly transfer to my NAS device are mkv, m2ts & flac files.  See attachment for more information on the Diskspeed results.

[JorgeB]

That looks normal, what's the source device? Also to rule out anything array related assign one disk as a single pool and tranfer to it, if it's still slow it's likely a source problem.

[Cyaankali]

7 hours ago, JorgeB said:

That looks normal, what's the source device? Also to rule out anything array related assign one disk as a single pool and tranfer to it, if it's still slow it's likely a source problem.

The source device is an old SATA hdd so maybe that's why the transfer speed is so slow.  When i am copying the same file from a M2 ssd to my NAS it's 100mb/s.  I also installed the unassigned device plugin but i don't have the place to add an extra disk/ssd in my NAS because it's already filled with eight 4TB hdd's.

[JorgeB]

11 minutes ago, Cyaankali said:

The source device is an old SATA hdd so maybe that's why the transfer speed is so slow. 

Likely, especially if it's faster from a different device.

[Cyaankali]

15 minutes ago, JorgeB said:

Likely, especially if it's faster from a different device.

Thanks again for all the help JorgeB.  I'll know what to do to solve this particular problem in the future.

[Nisha]

Hi,

 

I´m having the same issue. low transfer speed. No parity. 

tower-diagnostics-20240926-2221.zip

Edited September 26 by Nisha

[JorgeB]

11 hours ago, Nisha said:

I´m having the same issue. low transfer speed. No parity. 

Post new diags during a large file transfer, is this over SMB or locally?

[Nisha]

SMB transfer

tower-diagnostics-20240927-1141.zip

[JorgeB]

There's nothing writing to disk1 at the time the diags were saved, suggesting it's waiting for data (or you are transferring to another device), to confirm it's not a LAN issue, post the results of a single stream iperf test in both directions.

[Nisha]

To be honest, I don't have the best knowledge. I appreciate any help.

 

I am attaching a picture from my nas hard drive tree so you can see plus a diagnosis

tower-diagnostics-20241002-1735.zip

[JorgeB]

44 minutes ago, Nisha said:

I am attaching a picture from my nas hard drive tree so you can see plus a diagnosis

And this?

On 9/27/2024 at 10:49 AM, JorgeB said:

post the results of a single stream iperf test in both directions.

 

See here if you don't know iperf: