LACP and Jumbo Frames

Question

I am running my Pioneer Pro setup using LACP from my NAS to an HP 2915-8G switch. I connect to the switch using LACP to my Mac Pro, and normal ethernet to my Mac Mini. My Ultra2 also connects using LACP via the swtich, and that all works:)

However, when I change the network setup on the Pioneer Pro (and/or the Ultra2), as well as on my Mac Pro and Mac Mini, I can see and use the shares (they are mounted on my desktop using AFP), but I cannot get into and use FrontView. I can see the NASes using RAIDar, but I do not even get the login prompt when trying to connect to them using Chrome, Firefox, or Safari. To get back into them I have to reinstall the OS using the boot menu.

Any suggestions what is going on?

StephenB · Answer

When you disable LACP are you also removing the second ethernet cable?
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Also, sometimes LACP's MTU is configured separately from the normal ethernet MTU in the switch. &nbsp;I don't know if HP does that, but Netgear switches do.

KillerBob · Answer

I am not disabling LACP, I am "only" turning on Jumbo Frames, ie. setting the MTU to 9000. On the NASes, and on the Mac Pro and the Mac Mini. As soon as I so this, I can still access the shares, nut I cannot get into FrontView...

StephenB · Answer

KillerBob wrote:
I am not disabling LACP, I am "only" turning on Jumbo Frames, ie. setting the MTU to 9000. On the NASes, and on the Mac Pro and the Mac Mini. As soon as I so this, I can still access the shares, nut I cannot get into FrontView...

Got it
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Are you seeing errors in the ProCurve logs?
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I had a similar problem once, and the issue was that the max frame size for LACP wasn't inherited from the max frame size for the switch ports - it needed to be set separately. &nbsp; It might even be possible that ProCurve doesn't support JF with LACP.
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Retired_Member · Answer

I know this won't help to solve the actual issue, but honestly, Jumbo Frames is not going to bring any significant performance increase, even on an x86 box, it's just not worth the effort.

StephenB · Answer

jak0lantash wrote:
I know this won't help to solve the actual issue, but honestly, Jumbo Frames is not going to bring any significant performance increase, even on an x86 box, it's just not worth the effort.

They are enabled on my switch, but I keep them off on my equipment unless I am testing.
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When there is gain, it is related to CPU load, not the network itself. &nbsp;Larger packets means less frequent packet interupts and related processing, and that can sometimes improve performance. &nbsp;The faster the system, the less gain there is.
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JF are a nuisance when you have equipment with different MTU ceilings - resulting often in fragmented packets that are either dropped, or which slow down performance.
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That said, they should work in this case unless there is a restriction in the switch.

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LACP and Jumbo Frames

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