What made my FreeBSD server freeze?

[peter at vfemail.net]

Thanks.  I cloned the hard drive and replaced the old drive with the new drive this afternoon.  

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At 09:25 AM 8/30/2010, Ivan Voras wrote:
>On 08/30/10 13:24, peter at vfemail.net wrote:
>>
>>When I awoke this morning my FreeBSD box was frozen -- completely unresponsive at the console -- and displayed these messages on the console:
>>
>>      ad0: READ command timeout tag=0 serv=0 -resetting
>>      ata0: resetting devices
>>      ad0: removed from configuration
>>      done
>>      Aug 30 03:09:25 abc sm-mta 88427 xyz SYSERR(root): collect: Cannot write: ./xyz (fsync uid=o, gid=25): Device not configured
>>
>>The box has been in continuous operation for years, and I've never seen this behavior before.
>>
>>I rebooted the machine this morning and, thank God, it came back to life.
>>
>>Is this an early warning that the hard drive is failing and should be replaced this week?
>
>Very probably!
>
>>Is there anything else I should explore or do at this time?
>
>If not the drive, check drive cables, the power supply and motherboard/CPU overheating.
>
>
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