Re: Flash filesystem

Ok, I apologize.

Our filesystem is damaged in such a way that AutoScan process could not
repair it. I can see a lot of *.CHK files on my Storage Card and also I can
see files, but I can't run it. In storage manager is 2TB of unallocated space
visible which is most certainly not good. A release version of the image is
giving me a few exceptions after boot up so other drivers could not
initialise and the image is not running. But debug version runs through
AutoScan and boot itself up successfully except filesystem is corrupt as I
said before.
As I see AutoScan is trying to repair something but it's unsuccessfull.

Thanks, Jernej

"Bruce Eitman (eMVP)" wrote:

> Jernej:
>
> I am concerned about your use of the work "crash". That really has no
> meaning in an engineering discussion and should be avoided since it just
> slows down the discussion. What is actually happening?
>
> Without a clearer definition it is hard to comment on it.
>
> --
> Bruce Eitman (eMVP)
> Senior Engineer
> beitman AT applieddata DOT net
>
> Applied Data Systems
> www.applieddata.net
> An ISO 9001:2000 Registered Company
> Microsoft WEP Gold-level Member
>
>
> "turnsek" <turnsek@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:C72D20BE-DCFE-45BD-AFC0-ABC68F245755@xxxxxxxxxxxxxxxx
> > Hi!
> >
> > We come to conclusion that we should try other filesystems and drivers.
> Can
> > you please advise us which will be good for our conditions.
> >
> > PS: We tried to power down (suspend) platform at least 5 seconds before
> > reset hits and during stress tests. The filesystem also crashes after a
> > number of this cycles. We are using standard Stratad driver (in public
> > directory). Can we rule out software problems and concentrate on hardware?
> >
> > Thanks,
> > Jernej Turnsek
> >
> > "Bruce Eitman (eMVP)" wrote:
> >
> > > Zhongwei:
> > >
> > > As we both know all to well, you left something out of the theoretical
> > > discussion. The TFAT is only as stable as the media that it sits on,
> which
> > > can be made to be very unstable by the driver that manages it. Don't
> > > misunderstand me, flash is very stable, but can be corrupted if
> interrupted
> > > while erasing or writing to a block, BUT TFAT can manage to survive that
> as
> > > Zhongwei describes.
> > >
> > > The problem can happen if the media driver moves bits around on the disk
> to
> > > **without** going through the TFAT, or taking other precautions to
> prevent
> > > corruption of data. I believe that MSFlash does compact the data on the
> > > Flash to make room for new data, flash failures during that can be
> fatal.
> > > As Zhongwei points out this is all just theoretical though. I have not
> been
> > > able to prove this with MSFlash, mainly due to a shortage of source code
> and
> > > time. I have been able to prove this on other Flash drivers though. I
> have
> > > also found that suspend/resume can make it worse. Resets can be managed
> > > better because the disk can be scanned when the driver is loaded and
> > > repaired.
> > >
> > > --
> > > Bruce Eitman (eMVP)
> > > Senior Engineer
> > > beitman AT applieddata DOT net
> > >
> > > Applied Data Systems
> > > www.applieddata.net
> > > An ISO 9001:2000 Registered Company
> > > Microsoft WEP Gold-level Member
> > >
> > >
> > > "Zhongwei Wang" <MWang@applieddata[dot]_net> wrote in message
> > > news:OiHxm2IiFHA.2560@xxxxxxxxxxxxxxxxxxxxxxx
> > > > Transaction safe file systems can reliably survive the hardware reset,
> > > > theoretically, if it does it right. That is what they are advertised.
> > > TFAT
> > > > is not reliable enough right now then it only means it is not doing
> > > > everything correct and it needs improvement.
> > > >
> > > > There is advertised idea of having two state file systems, working
> state
> > > and
> > > > saved state, saved state is known good state. After a working state
> > > > transaction is fully finished, working state is saved or converted to
> > > saved
> > > > state. And any working state transaction will only write to unused
> > > blocks,
> > > > i.e. blocks not being used by saved state, so saved state will not be
> > > > touched. Does that sound perfect enough theoretically?
> > > >
> > > > --
> > > > Zhongwei Wang
> > > > Applied Data Systems
> > > > www.applieddata.net
> > > > Application - Ready embedded systems
> > > > Microsoft Windows Embedded Partner
> > > > Gold Level Member
> > > >
> > > >
> > >
> > >
> > >
>
>
>
.

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