(solved for now) [unRAID 6.4 stable] Slow network speed between 2 servers

[hitman2158]

Hello, guys,

 

I have a strange behavior with my 2 servers. First of all, the HW-specs.

Media server (aka Server A): Asus P8Z77 WS, Intel Xeon E3-1230v2, RAM 32GB, array consisting of 7 mixed hard disks plus SSD (Sandisk Plus 480GB) as cache, OS unRAID PLus 6.4.

 

Backup server (aka Server B): Asus A88XM-A, AMD A8-7600, RAM 8GB, array consisting of 5x4TB Toshiba plus SSD (Samsung 850 Evo 120GB) as cache, OS unRAID Trial 6.4.

 

Gaming rig: Asrock Fatal1ty Z170 Gaming K6+, Intel i7-6700K, RAM 16GB, 3 SSDs for system and data, OS Windows 10 Pro.

 

Switch: 8-port GBit (TP-Link or Trendnet)

 

Copy data (size 2MB-40GB) from the gaming rig to server A or B on the shares with ~110 MB/second.

Copy data (size of 2MB-40GB) from Server A to Server B using Krusader (Docker with SMB network connection) at ~45 MB/sec.

Copy data (size of 2MB-40GB) from server B to server A using Krusader (Docker with SMB network connection) at ~45 MB/sec.

 

It doesn't matter if I copy a single small file (20MB), a single large file (35GB) or several files with a total of 100 or 200GB. The speed remains at ~45 MB/s.

 

If I connect the shares of servers A and B to my gaming rig and then copy them from server A to B, the speed increases to ~110 MB/s.

 

Before I switched server B to unRAID 6.4 I had tried Openmediavault 3.0.96 and 4.0.14 on this server. It was the same result, direct writing with docker from server A to server B with only ~45 MB/second.

 

The settings are the same on both servers, Fix Common Problems does not report any warnings or errors.

 

BR

Peter

Edited January 16, 2018 by hitman2158
Problem solved for now, bottleneck is something with Krusader

[JorgeB]

Try a copy from one server to another without using docker to rule that out, e.g. on server A do this:

 

mkdir /x
mount //serverB/<share> /x -o user=nobody
time cp /x/path/to/big/file /dev/null
umount /x

Then calculate the speed by dividing the file size by the time it took.

[hitman2158]

Thanks for your reply, Johnnie. Will try this when I´m home from work.

 

 

[hitman2158]

Okay, tested 2 different files.

 

1st one is 2.798.144 KB, time was 24,477 sec, result was 114.317 KB/sec, so approx. 111 MB/sec.

 

2nd one is 12.335.591 KB, time was 108,659 sec, result was 113.525 KB/sec, so approx. 111 MB/sec.

 

That´s really strange. 

[JorgeB]

So the problem is likely some krusador bottleneck, you could use rsync instead.

[hitman2158]

Thanks for your supply, Johnnie.

 

As long as there is a bottleneck in Krusader I will use rsync.