(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

[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.