Slow Read-Speeds from Array/Cache, Writespeeds are good

[desertfox_0815]

Hey @ all.

 

lately i've noticed that my read speeds are around 78,5mb/s and very constant.

writing still runs arround 110-113mb/s no matter if i write to cache pool (2x 1Tb ssd) or directly into the array.

parity checks are running extremly fast so no read problem with the discs or adapter itself i guess..

nothing changed besides newest stable build of Unraid 6.10.3

 

i've attached my diagnostics and hope someone is able to help me.

 

thanks alot

tower-diagnostics-20220701-0705.zip

[JorgeB]

Start by running a single stream iperf test in both directions to see if it's network related.

[desertfox_0815]

is there a iperf version for unraid?

 

[itimpi]

4 minutes ago, desertfox_0815 said:

is there a iperf version for unraid?

 

If you start by installing the Nerd Pack plugin then iperf3 is one of the additional packages it can (optionally) install

[desertfox_0815]

Thanks just installed and tested.

 

iperf3 shows the same problem.

Sending to unraid is fast, receiving from unraid is only 0.7x speed

 

192.168.178.9 is my unraid and .10 my client.

 

 

root@Tower:~# iperf3 -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.178.10, port 58013
[  5] local 192.168.178.9 port 5201 connected to 192.168.178.10 port 58014
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   108 MBytes   908 Mbits/sec
[  5]   1.00-2.00   sec   113 MBytes   947 Mbits/sec
[  5]   2.00-3.00   sec   113 MBytes   948 Mbits/sec
[  5]   3.00-4.00   sec   113 MBytes   948 Mbits/sec
[  5]   4.00-5.00   sec   112 MBytes   936 Mbits/sec
[  5]   5.00-6.00   sec   111 MBytes   930 Mbits/sec
[  5]   6.00-7.00   sec   113 MBytes   947 Mbits/sec
[  5]   7.00-8.00   sec   113 MBytes   949 Mbits/sec
[  5]   8.00-9.00   sec   112 MBytes   936 Mbits/sec
[  5]   9.00-10.00  sec   111 MBytes   932 Mbits/sec
[  5]  10.00-10.05  sec  5.51 MBytes   945 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.05  sec  1.10 GBytes   938 Mbits/sec                  receiver
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
^Ciperf3: interrupt - the server has terminated
root@Tower:~# iperf3 -c 192.168.178.10
Connecting to host 192.168.178.10, port 5201
[  5] local 192.168.178.9 port 50918 connected to 192.168.178.10 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  82.0 MBytes   688 Mbits/sec   26    238 KBytes
[  5]   1.00-2.00   sec  80.6 MBytes   676 Mbits/sec    0    240 KBytes
[  5]   2.00-3.00   sec  79.8 MBytes   669 Mbits/sec    0    240 KBytes
[  5]   3.00-4.00   sec  79.8 MBytes   669 Mbits/sec    0    240 KBytes
[  5]   4.00-5.00   sec  81.1 MBytes   680 Mbits/sec    0    339 KBytes
[  5]   5.00-6.00   sec  80.0 MBytes   671 Mbits/sec    0    376 KBytes
[  5]   6.00-7.00   sec  80.0 MBytes   671 Mbits/sec    0    240 KBytes
[  5]   7.00-8.00   sec  78.8 MBytes   661 Mbits/sec    0    240 KBytes
[  5]   8.00-9.00   sec  80.0 MBytes   671 Mbits/sec    0    240 KBytes
[  5]   9.00-10.00  sec  80.0 MBytes   671 Mbits/sec    0    240 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   802 MBytes   673 Mbits/sec   26             sender
[  5]   0.00-10.00  sec   799 MBytes   670 Mbits/sec                  receiver

iperf Done.
 

[desertfox_0815]

also changed cat7 cable and switchport. did not solve problem.

server has been rebooted also.

my client is able to get full gigabit speed with speedtests over WAN and downloading stuff from WAN

Edited July 1, 2022 by desertfox_0815

[JorgeB]

42 minutes ago, desertfox_0815 said:

iperf3 shows the same problem.

That confirms it's a network problem, usually, NIC, switch, cables, etc.

[desertfox_0815]

Any idea how to find the problematic part?

Rebooted Unraid, Switch and Client. changed Switchports and cables.

[JorgeB]

Try a different NIC if available, ideally an Intel one.

[desertfox_0815]

Changed to a 1Gbit dual-port Intel server nic.

was running perfect with full speed.

i've filed a warranty claim with the mainboard seller. Board will be exchanged.

Thanks alot