How to solve mysterious system lockups?

[Kris Kennaway]

On Mon, Jun 04, 2007 at 04:40:56PM -0700, Nicole Harrington wrote:
> Hello
>   I have several systems that are used as squid
> caching servers. I have some systems that use SCSI
> disks and some  that use SATA disks. They are
> identical in everyway except for the sata vs SCSI
> drives. 
> 
>  At random times, the sata based systems seem to be
> freezing. You can ping them and they respond, but you
> cannot log in. Nor are any logs processed during that
> time. 
> 
>  I figure it mist be something to do with the disks,
> but I am not sure how to solve it. There seems to be
> little rhyme or reason. It does not happen necessarily
> during busy times. It can happen in the middle of the
> night.
> 
>  Any pointers in how to track down the cause would be
> much appreciated.

See the email I sent yesterday to a similar question.

Kris