[Info-vax] analyze/disk errors

[Stephen Hoffman]

On 2013-12-06 22:45:21 +0000, Simon Clubley said:

> I don't know if it's just me, but I think disk failure patterns have 
> changed.  Back in the 1990s, I did see disks with bad sectors 
> developing over time, but these days, I can only think of one disk over 
> the last 5 years or so which developed bad sectors while continuing to 
> stay online.
> 
> Most of the time these days the disks I have experience with either 
> start to fail by dropping offline and then maybe comes back online 
> after a power cycle before dropping off again, or just outright fail 
> with no warning.

I've seen a few that were merrily revectoring sectors until they ran 
out of spares, then the I/O got ugly.
Most of the SMART data was empirically not very useful for predicting 
failures, save for a few data points.
Related: <http://labs.hoffmanlabs.com/node/93>


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