zx6000 noisy fans after reboot (due to rack/headless mode?) (475 Views)
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Esteemed Contributor
Gregory Fruth
Posts: 356
Registered: ‎05-14-1996
Message 1 of 6 (475 Views)

zx6000 noisy fans after reboot (due to rack/headless mode?)

I recently rebooted my deskside ZX6000 and the
fans are now on full blast and very noisy.
Is there any way to throttle them?

Before the reboot the machine was a lot
quieter. The only thing I can think of is
that the firmware thinks that it's running in
rack mode so it turned the fans to full speed,
whereas before it was only spinning them up
as necessary.

I recently did swap out the monitor
because the old HP one died. I connected the
ZX6000 to the 2nd input on my PC's monitor
and rebooted; that's when the fans got noisy.
I can see the ZX6000 console and X11 output
on the PC monitor just fine; the only problem
is the fan noise.

I tried running racktower.efi (which you use
when you convert the machine from rack to tower and vice versa) and it correctly reports
that the machine is currently in tower
(deskside) mode. The fans in it are the
tower mode fans. The machine originally
came in the rack configuration but was
switched to tower mode years ago.
Honored Contributor
V. Nyga
Posts: 4,874
Registered: ‎09-20-2002
Message 2 of 6 (475 Views)

Re: zx6000 noisy fans after reboot (due to rack/headless mode?)

Hi,

have you tried another reboot?

Have you checked if the cooling air can pass without problems? Dust?
Maybe it's just hot at the moment?

V.
*** Say 'Thanks' with Kudos ***
Esteemed Contributor
Gregory Fruth
Posts: 356
Registered: ‎05-14-1996
Message 3 of 6 (475 Views)

Re: zx6000 noisy fans after reboot (due to rack/headless mode?)

I've rebooted several times while searching
in vain for a fan control setting or even a temperature or fan speed readout in EFI.
No change in the fan noise.

After the noise appeared I shut down the
machine and dusted as much as I could without
taking it all apart but I suppose there
could be more dust than usual in there.

I also used EFI to deactivate one of the
CPUs to try to lower the internal
temperature but that had no effect on the
fan speed.
Honored Contributor
rick jones
Posts: 3,814
Registered: ‎12-02-1996
Message 4 of 6 (475 Views)

Re: zx6000 noisy fans after reboot (due to rack/headless mode?)

It has been long enough since I was near one of those machines that I cannot recall specifics, but are you sure none of the fans died at the time of the reboot? Fans to full is one of the symptoms of a fan failure.
there is no rest for the wicked yet the virtuous have no pillows
Esteemed Contributor
Gregory Fruth
Posts: 356
Registered: ‎05-14-1996
Message 5 of 6 (475 Views)

Re: zx6000 noisy fans after reboot (due to rack/headless mode?)

I haven't been able to open the case to
check the fans, the latch handle plastic
was so brittle from age that it shattered
in my hand when I tried to pull it.

Is there any way to read out the fan status
or speed on these machines? I couldn't
find anything in STM or EFI.
Esteemed Contributor
Gregory Fruth
Posts: 356
Registered: ‎05-14-1996
Message 6 of 6 (475 Views)

Re: zx6000 noisy fans after reboot (due to rack/headless mode?)

I finally managed to pry the handle loose and open the case. All of the fans in the front are working.

Okay, after I typed that last sentence the fans went back to their normal noise level. I thought I noticed a brief red LED flash from somewhere but they all show green now.

Problem solved, I guess. I should finally get around to disposing of this machine.
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