Forum Discussion

Tutor

Dec 07, 2018

Bandwidth issue

Hello again. I've jut been doing some testing with the 128 raspberry cluster and the switch setup. Quick introduction: 128 raspberry pis connected through 4 GS748Tv4 switches which are stack...

Troubleshooting

tClancey

Tutor

Dec 08, 2018

Thanks for your reply.

I've tried variations, at the moment the Lag on switch one is port 2, 4, 6, 8, 48, 50 down to the next switch, switch 2 has two lags, 1, 3, 5, 7, 47, 49 up, and 2, 4, 6, 8, 48, 50 down, etc.

So you shouldn't mix fibre and copper, I'm guessing with this setup the copper is just being ignored as there's difference if connected or not.

And no, these aren't stackable switches, but I was reliably informed (I thought) that they could be chained with no (or very little) loss of speed.

Would I be better connecting switch 2, 3 and 4 directly to 1 and lose the chain? This would mean only using one fibre link per switch.

tClancey

Tutor

Dec 08, 2018

Actually, if you read the blurb the switches are stackable, with the fibre ports. More testing needed....

tClancey
Tutor
Dec 08, 2018
No, I think I'm wrong, the T version doesn't. Well, F. it! There's 4 748 switches going to hit ebay next week!
schumaku
Guru - Experienced User
Dec 08, 2018
Doesn't make sense - something is borked with the LAG config.