Re: System Cache

Hello John,

You can see the maximum size in Task Manager it is about 80% of the RAM.
As far as I know you cannot manipulate the location of the file system
cache.
It always lies on your default windows drive normally C:
And you cannot backup it, only when you use a image of the disk.

Again, it would be nice if anyone from Microsoft would tell us more about
this.

Manfred

"John John" <audetweld@xxxxxxxxxxx> schrieb im Newsbeitrag
news:eCIjXwJGHHA.1804@xxxxxxxxxxxxxxxxxxxxxxx
I know the difference between the pagefile and the system cache! I don't
dispute that it might be a problem in some circumstances! What I don't
understand is your initial statement: "Windows puts an area of the size of
about 80% of the RAM on the local disk. This is the "file system cache"."
What is this deal about the file system cache being on a different file on
the hard disc? Where does this information come from?

John

Manfred Senn wrote:

That is a big problem!?
I know this issues from a Windows 2003 Troubleshooting training, where
the trainer showed the increasing of the file system cache, while copying
a large amount of files, and we discussed the disadvantages of this
problematic.
You can watch the Cache in Task Manager - Performance - Physical Memory -
Systemcache.
You will see that Systemcache wont fill up to more than 80% of the size
of your RAM.

You wont find anything about that problematic in the internet. Microsoft
doesn't want that this is public.

File system cache an pagefile are totally different things.
You can fix the size of the page file, and you can see the file.
Set your page file to zero, and you will see that it has nothing to do
with the Systemcache. Your system will work.

Again: There is no way to see or fix the size of the file system cache,
only by changing RAM.
Again: Registry hacks dont fix this problem for Windows 2003!!! (maybe
2003 R2 does it? Idont know)
That's the hard truth. Don't put too much RAM in your computer if you
dont really need it. It can be contraproductive.

I know a company in germany that radically reduced RAM in domain
controllers (256MB) and servers because of problems with replication and
data synchronization.

I will contact the company and ask them to post details in the internet.

Manfred

"John John" <audetweld@xxxxxxxxxxx> schrieb im Newsbeitrag
news:uTr8MZIGHHA.3464@xxxxxxxxxxxxxxxxxxxxxxx

I would be glad if you pointed us to an article about this business of
the file cache being on the hard disc. Lets not confuse the pagefile
with the file cache. I only know of one file cache and it is in an area
of the RAM. Please provide further information for the disc file cache, I
would like to find out what this is all about.

John

Manfred Senn wrote:


Yes, there is a cache in the memory too, and I think this works together
with the file cache. I would be glad if anyone from Microsoft would
comment this ...

"John John" <audetweld@xxxxxxxxxxx> schrieb im Newsbeitrag
news:%23R3Wf27FHHA.1240@xxxxxxxxxxxxxxxxxxxxxxx


I thought that the File System Cache was an area of memory which held
files recently accessed on the hard drive? If the application then
needs to use the same file again or write to it, it is retrieved from
or written to the much faster memory cache instead of the disk. The
files are held or cached until flushed to the disk.

John

msenn@xxxxxx wrote:



Windows puts an area of the size of about 80% of the RAM on the local
disk. This is the "file system cache". Windows doesn't show you this
file system cache, but you can imagine it as a large file normally on
your Drive C. When you do large file copies to your disk, you can
monitor the increasing of the cache in the task manager. In this
moment
the copied files do not stay in the directory where you meant to copy
them. They are in the file system cache. This can last a long time
until the file system cache is emptied an written to the real
location.
Microsoft knows that there are problems with the file system cache
when
you have machines with much RAM. Maybe when you backup a system and
the
file system cache is not empty there can be a loss of data. In large
domain environments, this can cause problems, if the file system cache
is to big. There may be replication problems. To fix the problem some
companies go the way and reduce the memory of domain controllers to
256MB RAM. Because then the file system cache is 80% of 256MB, and the
problems are gone. There is no way to reduce the file system cache
manually (The only way is reducing RAM). You can find registry hacks,
but they dont work.

Bob I schrieb:




No, IT'S YOU that doesn't understand, you haven't started giving it
anything in particular to do yet.

b11_ wrote:




You don't understand. After I boot the computer and reach the
desktop, there
is about 1000 mb of free memory which is much more than enough to
run games.
There is never a shortage of free memory!
_________________________________________________________________

"Sharon F" wrote:





On Tue, 7 Nov 2006 16:33:01 -0800, b11_ wrote:





System cache is in memory. It is not on the drive.

And as I said, this is a good thing. When your system needs to
cache to the
hard drive because the RAM is needed for other tasks, it will do
so. As it
stands now, your system is running optimally. No need to change
anything.

--
Sharon F
MS-MVP ~ Windows Shell/User









.

Relevant Pages

  • Re: System Cache
    ... your claims about "file system cache" on disk is complete RUBBISH. ... There is no "file system cache" on disk... ... You can see the maximum size in Task Manager it is about 80% of the RAM. ...
    (microsoft.public.windowsxp.general)
  • Re: System Cache
    ... Windows puts an area of the size of about 80% of the RAM on the local ... This is the "file system cache". ... When you do large file copies to your disk, ...
    (microsoft.public.windowsxp.general)
  • Re: System Cache
    ... I know this issues from a Windows 2003 Troubleshooting training, ... File system cache an pagefile are totally different things. ... by changing RAM. ... written to the much faster memory cache instead of the disk. ...
    (microsoft.public.windowsxp.general)
  • Re: System Cache
    ... Yes, there is a cache in the memory too, and I think this works together ... much faster memory cache instead of the disk. ... This is the "file system cache". ... 256MB RAM. ...
    (microsoft.public.windowsxp.general)
  • Re: System Cache
    ... This is the "file system cache". ... Windows doesn't show you this ... Please backup your claims with some technical article ... 256MB RAM. ...
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