Learning the hard way SMB multi-channel

[morningwon]

Greetings freenas gurus!

I have built up my network and went full on 10 gigabit switch for connectivity between my esxi server, freenas and my pc.

I also have 1 gigabit connectivity for internet access.

I decided to enable SMB multi-channel and things got slower.

The first thing I did was to fire up wireshark and I noticed that even though I was mapped to freenas by IP address that the majority of the traffic was going over the gigabit connection. another tell tell sign was the MTU was not 9014 it was 60 on the packets.

the next thing I did was open up resource monitor on the windows pc and watched both interfaces during a transfer, sure enough the 1 gigabit connection was saturated and it was barely touching the 10 Gigabit connection.

I disabled SMB multi-channel on freenas and things returned to normal.

Has anyone else experienced this?

Anyways I hope this helps someone.

 

[MatthewSteinhoff]

1. Jumbo packets are usually more trouble than they are worth as they are insanely difficult to get right.
2. Intermingling paths of different speeds rarely works the way we think it will work.
3. LAG/LACP rarely works the way we think it will work.
4. Did you follow the SMB Multipath Instructions for FreeNAS?

Cheers,
Matt

 

[millst]

Did you try searching?

https://forums.freenas.org/index.php?threads/setting-up-smb-3-multichannel-on-freenas.59429/

AFAIK, it's still considered rather experimental.

-tm