On Apr 9, 2012, at 7:10 AM, Paul Kraus wrote:

>    Sorry for the off topic post, but I figure there is experience
> here. I have a total of ten J4400 chassis all loaded with SATA drives.
> Has anyone noticed a tendency for drives in specific slots to fail
> more often than others? I have seen more drive failures in slot 20
> than any other. I am wondering if there is something about slot 20
> that may be causing drives to fail.

It depends on the failure mode. 

From an electrical perspective, not all slots are equal. Electrical issues can
manifest themselves as noise or higher than normal BER. This can often be
seen in the link state counters, but you need to check all link ends: HBA,
expanders, and disks. Symptoms can include: timeouts, retries, intermittent
data corruption, etc.

From a mechanical perspective, not all slots are equal. Different slots have
different vibration characteristics. However, these rarely result in failures 
there does not appear to be a correlation vibration and disk failures.
 -- richard

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