Re: TFAT stability
- From: "Chris Tacke, eMVP" <ctacke@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 7 Jul 2005 10:53:28 -0400
That's got nothing to do with it.
--
Chris Tacke
Co-founder
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"turnsek" <turnsek@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:A9AD820A-A831-4C76-A5B8-F3F5AE18D33F@xxxxxxxxxxxxxxxx
> Our release version is using an option Full kernel mode. Could this be the
> problem? Should we use user mode instead of kernel mode?
>
> Jernej
>
> "Bruce Eitman (eMVP)" wrote:
>
>> > when we switched on TFAT, everything was ok. So, the problem may be in
>> block
>> > driver and not the TFAT. What do You think?
>>
>> I agree. My theory is that no matter how stable the file system is, if
>> the
>> disk driver moves bits around on the disk without going through the file
>> system, then all bets are off for stability. To make things even worse,
>> if
>> the disk is slow, then the window of opportunity for failure is large.
>> Flash is very slow for some operations.
>>
>> --
>> 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:22A46D5B-C3C8-4F5E-BCF4-98E392E3958F@xxxxxxxxxxxxxxxx
>> > Thanks for the reply.
>> >
>> > The problem is we don't have the WinCE5.0 yet.
>> > We have turned off AutoScan and the platform seems to be stable (for
>> > now).
>> > We are perfoming powerdown and powerup tests for now and we'll see if
>> > it
>> will
>> > survive overnight. I shure hope so.
>> > Regarding the AutoScan, I think the filesystem moust be unmounted
>> > during
>> > this scan and as that is not protected from powerdowns. This might be
>> > the
>> > problem during powerup. So I have removed AutoScan and we will see. I
>> shure
>> > hope so that there is no bug in the TFAT implementation or Msflash
>> > block
>> > driver implementation.
>> >
>> > O, yes. We have another platform with WCE4.2 and SH3 processor with CF
>> card.
>> > The configuration is almost the same. TFAT filesystem is on the CF card
>> and
>> > we don't have any problems. We had similar problems with FAT
>> > filesystem,
>> but
>> > when we switched on TFAT, everything was ok. So, the problem may be in
>> block
>> > driver and not the TFAT. What do You think?
>> >
>> > Thanks, Jernej
>> >
>> >
>> > "<ctacke/>" wrote:
>> >
>> > > I've actually got an open case with Microsoft on this issue. Their
>> first
>> > > suggestion, which I'm in the process of implementing, was to take the
>> TFAT
>> > > stuff from CE 5.0 and pull it into my 4.2 platform and see if that
>> > > fixes
>> it.
>> > > I'm not done yet, so I don't know if it fixes the problem, but you
>> > > might
>> try
>> > > the same.
>> > >
>> > > -Chris
>> > >
>> > >
>> > >
>> > > "turnsek" <turnsek@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
>> > > news:2617B633-7B34-41D8-A06F-7035956A920A@xxxxxxxxxxxxxxxx
>> > > > Yes, the flash modifying is the issue here, but why? I have tried
>> > > > to
>> > > > remove
>> > > > the registry hives from the flash to RAM and now my filesystem
>> crushes,
>> > > > but
>> > > > at least the platform boot itself (ethernet is working etc.). All
>> files
>> > > > are
>> > > > missing on my storage card (we are using Intel StrataFlash J3). I
>> > > > have
>> > > > also
>> > > > tried to make two partitions, both with files written to them. In
>> normal
>> > > > operation the application is only on the first patiition and all
>> > > > the
>> > > > wriiting
>> > > > and reading is done to that partiion. After crash, only files on
>> > > > this
>> > > > partition are missing. The second one is ok.
>> > > >
>> > > > Do I have some registry settings wrong for the TFAT or is it
>> > > > something
>> > > > else?
>> > > > I have check the newsgroups and it seems to me that a lot of folks
>> > > > are
>> > > > having
>> > > > this kind of problems. But there is no solution proposed except for
>> "UPS
>> > > > kind" of backup during power down. This is not an option for us.
>> Microsoft
>> > > > also said that TFAT is safe and stable. Ok, there could be an issue
>> with
>> > > > the
>> > > > msflash strata driver, but that is also supplied by them. So, where
>> > > > is
>> the
>> > > > catch? I' ve ruled out the hardware problem, because there is the
>> > > > consistency
>> > > > about filesystem crash. If it would be hardware then there would be
>> > > > problems
>> > > > with image and bootloader too and not with filesystem only.
>> > > >
>> > > > Thanks, Jernej
>> > > >
>> > > > "Bruce Eitman (eMVP)" wrote:
>> > > >
>> > > >> I have also seen these failures on a few platforms, both CE 4.2
>> > > >> and
>> 5.0.
>> > > >> I
>> > > >> think that it has a lot to do with background compaction and
>> > > >> removing
>> > > >> power
>> > > >> while the flash is being modified.
>> > > >>
>> > > >> --
>> > > >> 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:A6C143B2-6D21-49DF-8F05-B5950ECE3A2A@xxxxxxxxxxxxxxxx
>> > > >> > Hi all!
>> > > >> >
>> > > >> > We have PXA255 based platform with WCE42 and we are testing
>> stability
>> > > >> > of
>> > > >> the
>> > > >> > platform. Our hardware is not battery backed and we rely on
>> powerdown
>> > > >> driver
>> > > >> > and TFAT file system. We have noticed that after number of power
>> down
>> > > >> > and
>> > > >> > power up cycles (quite a lot) our platform dies. We have flash
>> resident
>> > > >> > persistent registry (hive based). Platform could not start
>> > > >> > anymore.
>> I
>> > > >> > am
>> > > >> > suspecting that the file-system is corrupted (so the registry
>> > > >> > too).
>> We
>> > > >> > are
>> > > >> > using msflash strata driver.
>> > > >> > Our settings are:
>> > > >> >
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager]
>> > > >> > "Dll"="fsdmgr.dll"
>> > > >> > "PNPUnloadDelay"=dword:0
>> > > >> >
>> > > >> > ; @CESYSGEN IF CE_MODULES_STRATAD
>> > > >> > ; HIVE BOOT SECTION
>> > > >> > ; StrataFlash block driver.
>> > > >> > [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\StrataFMD]
>> > > >> > "Dll"="stratad.dll"
>> > > >> > "Order"=dword:2
>> > > >> > "Prefix"="DSK"
>> > > >> > "Ioctl"=dword:4
>> > > >> > "Profile"="MSFlash"
>> > > >> > "IClass"="{A4E7EDDA-E575-4252-9D6B-4195D48BB865}"
>> > > >> > "MemBase"=dword:b9300000
>> > > >> > "MemLen"=dword:03000000
>> > > >> > "Flags"=dword:1000
>> > > >> >
>> > > >> > ; Override names in default profile
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MSFlash]
>> > > >> > "Name"="MSFLASH for STRATAFLASH"
>> > > >> > "Folder"="Storage Card"
>> > > >> >
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager\Profiles]
>> > > >> > "AutoMount"=dword:1
>> > > >> > "AutoPart"=dword:1
>> > > >> > "AutoFormat"=dword:1
>> > > >> >
>> > > >> > ; Keep FATFS from trying to shadow \Windows
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager\Profiles\MSFlash\FATFS]
>> > > >> > "MountFlags"=dword:2
>> > > >> >
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager\AutoLoad\MSFlash]
>> > > >> > "DriverPath"="Drivers\\BuiltIn\\StrataFMD"
>> > > >> > "LoadFlags"=dword:1
>> > > >> > "Order"=dword:0
>> > > >> >
>> > > >> > ; END HIVE BOOT SECTION
>> > > >> > ; @CESYSGEN ENDIF CE_MODULES_STRATAD
>> > > >> >
>> > > >> >
>> > > >> > ; @CESYSGEN IF FILESYS_FSREGHIVE
>> > > >> > ; HIVE BOOT SECTION
>> > > >> > [HKEY_LOCAL_MACHINE\init\BootVars]
>> > > >> > "SYSTEMHIVE"="Registry\\system.hv"
>> > > >> > "PROFILEDIR"="Registry"
>> > > >> > "Start DevMgr"=dword:1
>> > > >> > "DefaultUser"="Iskraemeco"
>> > > >> > ;Causing some debugchk's in debug version,
>> > > >> > ;performance monitoring tools doesn't work.
>> > > >> > ;RegistryFlags"=dword:1
>> > > >> > ; END HIVE BOOT SECTION
>> > > >> > ; @CESYSGEN ENDIF FILESYS_FSREGHIVE
>> > > >> >
>> > > >> > [HKEY_LOCAL_MACHINE\System\StorageManager\FATFS]
>> > > >> > "FriendlyName"="FAT FileSystem"
>> > > >> > "Dll"="fatfsd.dll"
>> > > >> > ;"Flags"=dword:00000024
>> > > >> > "Flags"=dword:007C0028
>> > > >> > "Paging"=dword:1
>> > > >> > "EnableCache"=dword:1
>> > > >> > "CacheSize"=dword:0
>> > > >> > "Util"="fatutil.dll"
>> > > >> > "FormatTfat"=dword:1
>> > > >> > ; END HIVE BOOT SECTION
>> > > >> > ; @CESYSGEN ENDIF CE_MODULES_FATFSD
>> > > >> >
>> > > >> >
>> > > >> > Any help would be more then welcome.
>> > > >> >
>> > > >> > Thanks, Jernej
>> > > >> >
>> > > >>
>> > > >>
>> > > >>
>> > >
>> > >
>> > >
>>
>>
>>
.
- References:
- TFAT stability
- From: turnsek
- Re: TFAT stability
- From: Bruce Eitman \(eMVP\)
- Re: TFAT stability
- From: turnsek
- Re: TFAT stability
- From: <ctacke/>
- Re: TFAT stability
- From: turnsek
- Re: TFAT stability
- From: Bruce Eitman \(eMVP\)
- Re: TFAT stability
- From: turnsek
- TFAT stability
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