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Why no CldFlt service?



 
 
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  #1  
Old August 5th 17, 03:33 PM posted to alt.comp.os.windows-10
Terry Pinnell[_3_]
external usenet poster
 
Posts: 732
Default Why no CldFlt service?

I'm still trying to isolate the cause of frequent hard crashes. Studying
Event Viewer (a daunting experience that never fails to depress me)
shows a bunch of vague possibilities to pursue.

One is Event ID 7000, "The CldFlt service failed to start due to the
following error:
The request is not supported." This occurred either just before, during
or just after the latest such crash (which always need a forced
restart).

But I don't see such a service listed on my Win 10 Pro PC!

So naturally I cannot try the suggested fix he

http://www.robsteele.co/fix-cldflt-service-error-7000/

Insights anyone please?

Terry, East Grinstead, UK
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  #2  
Old August 5th 17, 03:54 PM posted to alt.comp.os.windows-10
Elvira
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Posts: 27
Default Why no CldFlt service?

On 05-Aug-2017 10:33, Terry Pinnell wrote:
I'm still trying to isolate the cause of frequent hard crashes. Studying
Event Viewer (a daunting experience that never fails to depress me)
shows a bunch of vague possibilities to pursue.

One is Event ID 7000, "The CldFlt service failed to start due to the
following error:
The request is not supported." This occurred either just before, during
or just after the latest such crash (which always need a forced
restart).

But I don't see such a service listed on my Win 10 Pro PC!

So naturally I cannot try the suggested fix he

http://www.robsteele.co/fix-cldflt-service-error-7000/

Insights anyone please?

Terry, East Grinstead, UK


HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\CldFlt
  #3  
Old August 5th 17, 09:27 PM posted to alt.comp.os.windows-10
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default Why no CldFlt service?

Terry Pinnell wrote:
I'm still trying to isolate the cause of frequent hard crashes. Studying
Event Viewer (a daunting experience that never fails to depress me)
shows a bunch of vague possibilities to pursue.

One is Event ID 7000, "The CldFlt service failed to start due to the
following error:
The request is not supported." This occurred either just before, during
or just after the latest such crash (which always need a forced
restart).

But I don't see such a service listed on my Win 10 Pro PC!

So naturally I cannot try the suggested fix he

http://www.robsteele.co/fix-cldflt-service-error-7000/

Insights anyone please?

Terry, East Grinstead, UK


It took a while to find any kind of background at all.
Except the usual "change the Start key from 2 to something else".

0 Boot (loaded by kernel loader)
1 System (loaded by I/O subsystem)
2 Automatic (loaded by SCM)
3 Manual
4 Disabled (Service should not be started)

That covers the "how to make it quiet". Finding it in the
registry, changing the Start key for cldflt, just might
eliminate the error. But it doesn't change the need for it,
for some part of OneDrive operation. An active OneDrive user,
we don't know if this is being used or not. Automatic, the
value it has now, would seem to have been appropriate as a
choice, in terms of "being ready" for OneDrive. OneDrive itself
has some "easy-uninstall" methods, but just as easily, the
system can put it back, faster than you can say Jack Robinson.

The following suggests OneDrive is having its rails greased
for the November update. Whether that is having an effect on the
implementation, and removing the need for cldflt (Cloud Filter Driver),
who can say ?

*******

Search terms: cldflt onedrive

https://arstechnica.com/information-...nts=1&start=80

"Microsoft is using a file system filter driver for the on-demand feature.
OneDrive creates a "file" that is attribute tagged as a SparseFile (which
lets it take up 0 bytes but seem to be X bytes big), ReparsePoint (likely
to trigger the filter driver), and Offline (the same tag used by the old
Offline Files, and used in the same way to denote the file isn't locally
present). Then, when a program attempts to open said file, access to the
file goes through the FS filter list, hits "CldFlt" which checks if it's
tagged "Offline". If yes, then the filter asks the OneDrive sync service
to hydrate the file before handing it off to the next filter. Unless the
program has some really strict timeout on file opening, it'll just seem
to take longer than normal, but otherwise no different than opening any
other file.

(The Explorer thumbnail extractor seems to be special-cased, and gets the
thumbnails the online OneDrive server creates. My JPGs that aren't pinned
have thumbnails, but my DNGs do not, even though I have a local WIC for
DNGs. And even if the file IS downloaded, the thumbnailer won't use local
resources to create one if the server didn't have one for it.)

From what I can gather from poking about, it does nothing more fancy than
this. It doesn't use alternate data streams or any other data stashing
shenanigans. I also noticed a really-quick file copy dialog, so I think
it might not even be doing a background fill on the file directly (instead,
it's downloading into the hidden OneDriveTemp folder it's used in the past,
then replacing the file before moving on to opening it). Other than keeping
the ReparsePoint attribute tag, files that are downloaded seem normal in
every way. I've not tried popping the volume into another system to check
if the data is readable or not (I'm syncing to a Storage Space mirror, so
it's twice the pain to pull the drives to test). I do know that a VSS backup
pulled them as-is, and they're readable on my backup server (even with the
ReparsePoint tag).

Not being supported on file systems other than NTFS thus isn't due to
anything that is unique to NTFS; ReFS supports ReparsePoints and SparseFiles
just fine (although the various FATs do not). So why doesn't it work on ReFS?
It's likely just down to testing and validation. They only wrote the filter
to support NTFS, only tested it on NTFS, and are taking the path of less
weird bugs by forcing it to only be used that way. ReFS probably works just
fine, but they would rather not have angry, and in the case of Office365
people, paying customers complaining about corrupted files or somesuch. (As
for FAT support, they could probably do it via some hacks, but that likely
got vetoed. I could see them relenting to customer pressure to allow syncing
to FAT volumes in the future, but only in the old way without the
placeholders.)

As an aside, there's other NTFS "features" that are done via filter drivers.
File quotas are one; write access is mediated and denied or logged via a
filter and associated service. Deduplication is another, which also happens
to work similarly to OneDrive; in its case, though, it makes special reparse
points that the filter then links up to its big database of chunks stashed
inside the "System Volume Information" folder. It too only works on NTFS,
but likely more because its implementation is very specific to NTFS. Dedupe
on ReFS wouldn't be implemented the same way at all.

As another aside, the upcoming Google Drive Stream client actually DOES
present a virtual file system and mounts it as a drive, stashing the actual
data in the user's AppData\Local folder (and, thus, causing issues for anyone
trying to pin large amounts of data on systems with small boot drives).
"

OneDrive isn't running on my Release 15063.483 system right now,
so it isn't a good example of a "healthy" system. I'll have to
drop the Release disk and put in the Insider, and see what that's
up to.

HTH,
Paul

  #4  
Old August 6th 17, 01:00 AM posted to alt.comp.os.windows-10
Paul[_32_]
external usenet poster
 
Posts: 11,873
Default Why no CldFlt service?

Terry Pinnell wrote:
I'm still trying to isolate the cause of frequent hard crashes. Studying
Event Viewer (a daunting experience that never fails to depress me)
shows a bunch of vague possibilities to pursue.

One is Event ID 7000, "The CldFlt service failed to start due to the
following error:
The request is not supported." This occurred either just before, during
or just after the latest such crash (which always need a forced
restart).

But I don't see such a service listed on my Win 10 Pro PC!

So naturally I cannot try the suggested fix he

http://www.robsteele.co/fix-cldflt-service-error-7000/

Insights anyone please?

Terry, East Grinstead, UK


I don't think cldflt.sys is a regular service. I don't see
it in Process Explorer. Or in Tasklist /svc.

http://s1.postimg.org/vg1vg2h9r/minifilters.gif

I checked the volume on the running one, and I can't
find any INF file to install cldflt. This article kinda
hints at how they install. And I have seen such files,
like if you have an add-in storage card in the past,
it had a kind of service definition in an INF file,
but it wasn't a regular service.

https://docs.microsoft.com/en-us/win...-and-unloading

And that means at this point, only that Start key in
the registry is available for tweaking. If there
was something wrong with the minifilter, I cannot figure
out how to reinstall it. I tried looking at OneDrive
ecosystem and cannot seem to find any portion of it
that is responsible.

And I cannot see a profit, in changing the Start from 2 (Auto),
to 3 or 4, except for the removal of the error message. I can't
even tell if it needs to be running today or not. My Release
didn't have a running OneDrive on it.

Paul
  #5  
Old August 6th 17, 09:51 AM posted to alt.comp.os.windows-10
Terry Pinnell[_3_]
external usenet poster
 
Posts: 732
Default Why no CldFlt service?

Paul wrote:

Terry Pinnell wrote:
I'm still trying to isolate the cause of frequent hard crashes. Studying
Event Viewer (a daunting experience that never fails to depress me)
shows a bunch of vague possibilities to pursue.

One is Event ID 7000, "The CldFlt service failed to start due to the
following error:
The request is not supported." This occurred either just before, during
or just after the latest such crash (which always need a forced
restart).

But I don't see such a service listed on my Win 10 Pro PC!

So naturally I cannot try the suggested fix he

http://www.robsteele.co/fix-cldflt-service-error-7000/

Insights anyone please?

Terry, East Grinstead, UK


I don't think cldflt.sys is a regular service. I don't see
it in Process Explorer. Or in Tasklist /svc.

http://s1.postimg.org/vg1vg2h9r/minifilters.gif

I checked the volume on the running one, and I can't
find any INF file to install cldflt. This article kinda
hints at how they install. And I have seen such files,
like if you have an add-in storage card in the past,
it had a kind of service definition in an INF file,
but it wasn't a regular service.

https://docs.microsoft.com/en-us/win...-and-unloading

And that means at this point, only that Start key in
the registry is available for tweaking. If there
was something wrong with the minifilter, I cannot figure
out how to reinstall it. I tried looking at OneDrive
ecosystem and cannot seem to find any portion of it
that is responsible.

And I cannot see a profit, in changing the Start from 2 (Auto),
to 3 or 4, except for the removal of the error message. I can't
even tell if it needs to be running today or not. My Release
didn't have a running OneDrive on it.

Paul


Thanks for those two characteristically thorough posts, Paul.

Ah - so OneDrive is involved.

(Please remember my technical know how is way below yours. I'm
struggling with some of what you wrote and quoted.)

I was about to post a different question, about OneDrive. I suspect the
two issues are related, so I'd appreciate your comments on that post too
please.

Meanwhile (thanks for the link Elvira) I've changed that Start parameter
from 2 to 4 by way of experiment.

Terry, East Grinstead, UK

 




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