ODY1980 Author

Level 1

9 points

Imac Pro - Crash when copy over 200GB on SMB !?

Hello, I have a really strange problem - since I upgrade to my new imac pro.

I really hoped for the 10.13.3 update - because it mentioned to fix SMB problems with crashes - but sadly it didn't help.

The problem I have is the following:

When I copy my VM Ware Folder (via 1Gbps ethernet cable) as a backup to a synology via SMB as soon as I hit around 200GB over the network the network of the imac stalls. No more receiving/sending - no more possibility to ping - even trying to disable and reenable the network doesn't work. No errors shown in any network utlity of bad packets etc. If I just wait then the mac just reboots itself without any error message and comes back.

What I tried so far:

1) Another imac Pro - same issue!
2) Even though the lockup happens on the imac (so it can't be solely related to the network itself) i tried to check if there is anything wrong in the network. Changed router, Change switch, Changed network cable etc. ! However with an old imac I can copy the file on the same line easily without any issues.

3) Tried different SMB settings 2.0 / 3.0 / disabled signing etc. - everything without any help.

For me its clear there is a severe driver issue with the new 10GB network port on the imac pros - but how can I truly identify the issue and report it to apple - so they take me serious without doing the normal troubleshooting...

If anyone has an idea, I would be more than happy to hear it 🙂

Like i said if i for example copy 50GB and then later 150GB - it will happen at 150GB - so it look like something is running full in a some kind of buffer at 200GB copy over network to smb.

Kind regards,
Oliver

macOS High Sierra (10.13.3), null

Posted on Jan 24, 2018 12:29 AM

Top-ranking reply

ODY1980 Author

Level 1

9 points

Posted on Jan 24, 2018 8:44 AM

Hey there - with your help I was finally able to find the issue.

Manually did not help me in the beginning because 1000T was correctly set by automatic. But automatic also sets the full duplex mode to:

full-duplex, flow-control, energy-efficient-ethernet

The problem here is the last option -> energy-efficient-ethernet <- this causes when using the SMB protocol and copying more than 200GB of data to the network to completly crash or stall the imac pro.

So all you need to do is changing it to manual and setting the full duplex to: full-duplex, flow-control

without this energy-efficient-ethernet - this also boosts your network speed by 2-3mb/sec.

I reported this to apple and hopefully they will make a fix with the automatic setting.

Kind regards,

Oliver

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36 replies

Feb 13, 2018 8:45 AM in response to Wunderlicht

Hey Wunderlicht,

Any updates from the Apple Team? Where they able to reproduce the issue?

Feb 19, 2018 8:21 PM in response to IndianaPwns

I just hope these iMac Pro issues don't fall into the 1% that 10.13.4 doesn't fix

ODY1980 Author

Level 1

9 points

Jan 24, 2018 9:28 AM in response to spertti

I don't think the speed negotiation was the problem - because it did negotiate the correct speed for me at 1000baseT and I still had the issue on manual.

But as shown in your screenshot, leaving this new energy-efficient-ethernet off seems to be the cure of all evil - at least for this SMB issue (it did work well on AFP).

Jan 31, 2018 11:56 AM in response to ODY1980

We are experiencing the exact same issue - very frustrating. First with finder disconnecting from SMB shares in 10.13.2 and now this...

This problem has NOT been solved. We have yet to transfer over 200GB to our SMB Share over our 10Gbps connections at proper 10Gb SMB speeds (~400 - 600Mbps). I have been back and forth with our tech support of our Server supplier and this all looks very strange and new to them. My guess is there's still a bug/issue in High Sierra.

As discussed in this thread, we tried changing things to Manual, 10GbaseT, full-duplex, flow-control, energy efficient ethernet turned off, Standard (1500) and our connection is a silly 10Mbps...no getting to 200GB this century with those speeds.

Apple please help - we'd love to use our new iMac Pro's with our SMB Share...to be honest - our business depends on it.

Jan 31, 2018 12:44 PM in response to ODY1980

Haha!

It's NOT JUST ME!

Sorry. I know that's a little sad, but I've been working with Apple to try and fix this for nearly two weeks!

Here's a video of my system doing almost the same thing:

My Brand-New iMac Pro Constantly Crashes! - (iMac Pro Network woes on 10.13.3) - YouTube

I should note however, that my crashes occur REGARDLESS of the share type. SMB, AFS and NFS all do the same thing after 200-300 GB has been transferred. And it happens on both 10 GBe internal. My machine has also been crashing without the 10GBe network enabled, and a Sanlink3 T1 in use instead.

I'm out of the office today with a kiddo at home, but I'm going to try and get in tonight to give this suggested fix a go.

Nikki.

ODY1980 Author

Level 1

9 points

Feb 5, 2018 1:26 PM in response to Nikki Gordon-Bloomfield

I am really happy to see that it indeed looks like the culprit 🙂 Apple is already informed about that so I would say they will soon be able to address it. Curious now on how they will solve it - hopefully they can do a driver update and fix the network card issue with TSO - because TSO is not a bad thing actually!

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Imac Pro - Crash when copy over 200GB on SMB !?