Re: LSI MegaRAID SAS 9240-4i hangs system at boot
On Sun, 20 May 2012 23:35:58 -0300, Henrique de Moraes Holschuh wrote:
> On Sun, 20 May 2012, Ramon Hofer wrote:
>> On Sat, 19 May 2012 13:06:40 -0300, Henrique de Moraes Holschuh wrote:
>> > On Sat, 19 May 2012, Ramon Hofer wrote:
>> >> On Sat, 19 May 2012 04:19:33 -0500, Stan Hoeppner wrote:
>> >> > On 5/19/2012 2:52 AM, Ramon Hofer wrote:
>> >> >> On Fri, 18 May 2012 17:57:56 -0500, Stan Hoeppner wrote:
>> >> >>> On 5/18/2012 9:39 AM, Shane Johnson wrote:
>> >> >>>> After that I would look to see if
>> >> >>>> something isn't shorting out a USB port.
>> >> >>>
>> >> >>> Yes, USB is the cause of the over-current errors, which is
>> >> >>> plainly evident in his screen shot. But we don't yet know if
>> >> >>> this USB problem is what's hanging the system. Further
>> >> >>> troubleshooting is required.
>> >> >>
>> >> >> The strange thing is as I mentioned in another post is that on
>> >> >> the mb usb port 8 there's nothing attached and I haven't found
>> >> >> where port 7 is :-?
>> >> >
>> >> > I wouldn't worry about the USB errors at this point. Unless there
>> >> > is some larger issue with insufficient power on the motherboard
>> >> > causing the USB current error, it's likely unrelated to the
>> >> > storage hardware issue.
>> >> > Fix it first, then worry about the USB errors. Given you have no
>> >> > device plugged into those ports, it could be a phantom error.
>> >>
>> >> Yes I hope you're right with the phantom error :-) Especially
>> >> because I can't find port 7. No label on the mb pcb nor in it's
>> >> documentation.
>> >
>> > It might well mean one of the power planes is oversubscribed, and
>> > THAT can cause anything up to and including damage to hard disks,
>> > data corruption, and crashes.
>>
>> Thanks for the suggestion, Henrique!
>> The PSU is a 750 W so I think it should be enough for now.
>
> Yes, it is probably enough. You have to do a lot to overpower a *good*
> 750W PSU (a crappy one, OTOH...).
>
> You should still do all testing with the minimal hardware setup. From
> experience, you also need to be able to test using no keyboard or a
> different keyboard (and mouse)... USB is supposed to be safe from this
> crap as it can detect overcurrent, but since it IS detecting overcurrent
> in your case (be it a faulty alarm or not)...
The PSU is a Thermaltake. I have two PSUs with less power. Maybe I should
try it with one of them?
I will try this evening with a old ps2 keyboard. But it would surprise me
if this is the source of the problem because the usb transmitter for the
keyboard / mouse is used in another computer without problems and the
over-current messages are always related to port 7 and 8. Using a
different usb port makes no difference...
Best regards
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