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vett93

macrumors 6502
Original poster
Jul 27, 2014
263
34
California
If I keep my MacPro 6,1 up for over a week, I would wake up one morning and find all USB devices have been disconnected. All my USB devices are connected to my MacPro via powered USB hubs. Some of them have their own power supplies. How do I find out what caused the MacPro to disconnect them? Is there a way to reconnect them without rebooting the MacPro?

It did not do this when it was new. But it happens regularly nowadays. Any pointers would be appreciated.
 

th0masp

macrumors 6502a
Mar 16, 2015
698
391
germany
Might be the OS - are you keeping up with system updates? I had that with a few old releases back in the day and it always took a long while till the problem was acknowledged and fixed while the forums knew it all along. Main reason I went from updating regularly to basically never. When it happened it was bad like drives disconnecting while I was accessing them.

I've not seen this in years now across my various computers and certainly not with my current setup with all my external devices sans tablet connected through two hubs, all powered by the Trashcan.

The other possibility is that you have a developing hardware issue right there. Perhaps there's a way to diagnose if e.g. the I/O board has taken a hit?
 

th0masp

macrumors 6502a
Mar 16, 2015
698
391
germany
What Mac OS version do you use now, if I may ask? :)

Mojave in my case - but without any 2020 security patches. The USB troubles I ran into happened much earlier though - Lion, Mavericks, around these times. I think I my have joined these forums initially to solve them... ;)

There's a service manual for the Trashcan floating around these forums. You may want to track that down to see if there are any procedures to diagnose if it's a hardware issue.
 

vett93

macrumors 6502
Original poster
Jul 27, 2014
263
34
California
Mojave worked very nicely with my Trashcan. Every since I upgraded it to Catalina, I started to have a number of problems. USB disconnect is one of them. Apple Mail would fail to read my Yahoo mail after a day of uptime, and I have to restsart Apple Mail to continue receiving my Yahoo mail. Other email accounts work nicely though.

I wonder if this is Apple's reminder that the Trashcan is getting old...
 

vett93

macrumors 6502
Original poster
Jul 27, 2014
263
34
California
I did a hardware diagnostics by holding the D key while booting the machine up. It showed no issues.

Would you recommend that I downgrade the OS to Mojave?
 

nobullone1964

macrumors regular
Oct 20, 2018
208
62
There is a piece of free software called Keep Drive Spinning for Mac that may help you. Google it...it won't kill you to try it.
 

th0masp

macrumors 6502a
Mar 16, 2015
698
391
germany
I did a hardware diagnostics by holding the D key while booting the machine up. It showed no issues.

Would you recommend that I downgrade the OS to Mojave?

If your drives take a week or so to disconnect then I don't think running that hardware diagnostic tool would go 'deep' enough to catch that in case it does turn out to be a hardware issue.

Downgrading OS ... well if you have a working, recent backup to simply switch to then it sounds like an option. But downgrading the main installation manually - uhhh, I think I'd rather live with the USB issue and restart the computer once a week.
 
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vett93

macrumors 6502
Original poster
Jul 27, 2014
263
34
California
There is a piece of free software called Keep Drive Spinning for Mac that may help you. Google it...it won't kill you to try it.
I have a USB microphone and a USB webcam connected to a powered USB-hub. They get disconnected too.

I have long running jobs on AWS VMs and my MacPro monitors them. If I reboot my MacPro, these long running jobs crash too.
 
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