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Re: [dm-devel] Hard drives shutting themselves off in RAID mode


In PC's ground is usually connected to the box itself. To be sure ground in the PSU's can just be connected.

I have never experienced problems with ground loops in PCs. In PC's you have all kinds of ground loops, as the same ground is usually connected to signal leads, power supply leads and the chassis. As long as the cables are kept short this shouldn't cause problems.


Rune Sætre <rune saetre netcom-gsm no>
NetCom as

On Sun, 18 Jun 2006, Greg Freemyer wrote:

On 6/18/06, Rune Saetre <rune saetre netcom-gsm no> wrote:

> Arno Wagner:
>> If you can test it with reasonable effort and cost (e.g. put some of
>> them on another PSU), you might want to do that.
> Is that safe?

Don't know how safe it is to use different PSU's, but I have done it with
success several times on old hardware used for testing. I can't think of
any reason you should run into trouble if ground is common, and the disks
are powered up first.

Its the common ground part that can be challeging.  I'm not an expert
of PC powersupplies, but in general power supplies have a floating
ground, so if you have two of them plugged in the same AC power, you
will still not have a common ground on the DC side.

Greg Freemyer
The Norcross Group
Forensics for the 21st Century

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