Re: ReiserFS causing kernel panic?

[Hans Reiser <reiser@namesys.com>]

Ihar 'Philips' Filipau wrote:

> Hans Reiser wrote:
>
>> reiserfs is not warranted to work on corrupted hdds.....
>
>
>   Is there any kind of error statistics for hard drives?
>
>   Geometry is known.
>   I suspect that structure of damages, caused by contact of plates 
> surface with head, can be classified. 

>
>
>   It may be possible to classify manufacturing glitches. I think HD 
> producers have this kind of classification/statistics - to improve 
> quality, keeping price low.
>
>   Actually what I'm thinking of: some kind of design rules for file 
> systems, how to minimize crashing due to hdd glitches.
>   Let's say, if some of hdd regions are know to be more error prone - 
> desing fs to use those regions less.
>   If hdd damages used to have some specific structure - design file 
> system to keep renundant data in regions which are less likely to be 
> lost both at the same time. So renundancy would make sense.
>
>   Is there any thing like this?
>
>   Or file systems now do outlive hard drives?-)
>


Block allocation policies affect performance a lot, and keeping them 
simple is important.    I would however be interested in knowing what 
the distribution function for errors by geometry is.  If it turned out 
that, say, errors were higher at the platter edges, I could make some 
format changes....

I think that for users it is best to think about how to mask drive 
errors in the device layer or the device using RAID and mirroring.

-- 
Hans