Re: nilfs fault tolerance

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Hi Mark,

On Oct 17, 2012, at 5:11 PM, Mark Trumpold wrote:

> Hello all,
> 
> I have been using nilfs for some time now, and am quite happy with the
> features and performance.
> 
> I have also been promoting it as a filesystem of choice for 'appliances'
> that as normal course do not get gracefully shutdown (power switch off).
> This robustness bears out in my own testing.
> 
> The recent posts regarding "corrupt root inode" have me a little concerned
> about my understanding.
> 
> Is my current assumption correct, in that if the hardware does something
> weird and scribbles badly to the filesystem, then obviously all bets are
> off --- otherwise nilfs should be robust against the 'power off' (no
> graceful shutdown)?
> 

I think that currently above-mentioned issue (NILFS: corrupt root inode after Turbo Mode?) can't be a basis for discussion. From my point of view, we have currently unreproducible issue with absence of reproducing path description. An issue should be steady reproducible firstly, from my point of view. I haven't whole picture of situation on the volume currently. So, I think that it is early to discuss about something.

Why do you think that it was sudden power-off? We haven't reproduction path of the issue. So, we don't know the reason and technical environment of the issue. This concrete NILFS2 filesystem lives from August and it was successfully mounted 56 times. It has some strange state of primary and secondary superblocks. So, it was not enough information for any conclusions.

I suspect the hardware reason but I haven't strict evidence of it.

With the best regards,
Vyacheslav Dubeyko.

> Thanks in advance,
> Mark T.
> 
> 
> 
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