[OpenIndiana-discuss] System disk corruption

[Chris Gerhard]

On 02/19/12 12:33, Robin Axelsson wrote:
> What is conspicuous is that there are _no_ errors in iostat:
>
> ----------------------------------------
> c2d0             Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
> Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
> Illegal Request: 0
> ----------------------------------------
> So am I to understand that the cause of this is entirely software 
> related? If there was an error in the hard drive then iostat should 
> have returned some errors as well. This is not the first time this 
> happens to me and last time it happened was on another hard drive.
>
>

This is exactly why we have ZFS.  iostat only reports errors that the 
drive has found. If it or any of the IO path between it and RAM manage 
to corrupt the data that was silent data corruption prior to ZFS. With 
NFS you now get an error.

Not sure why the counts are different though.

>
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