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Data corruption while using shared folders

Source: microsoft.public.virtualpc
Sent: 09/23/2008
From: hex_messer
Message:

I look through this discussion and did not find such question (but find
question, that arise because this problem: MDB corruption).
So, anybody expirience this?
For now I found, that this it's not important, what guest and host os, but
is important what processor host OS using. On my notebook Centrino Duo - with
2 cores - installed. On my test machine - TX300 server - one Xeon CPU
installed (with HyperThreading support). Also I test it on some other
desctops and notebooks. I found, that problem persists on some system with
more than one processor (I can test only up to two) and on systems with
HyperThreading enabled - when HD disabled and one CPU - no problem.
Now guest os running with latest VM additions (for vpc 2007 sp1): 13.820
with this version I can see only file data corruption. Earlier I expirience
more generic errors - e.g. explorer or cmd.exe crush while directory
exploring (listing).

For illustration of data corruption I use simple test sequence: calculate
MD5 for a large file (e.g. film 700MB) on host os, and then a few times on
guest OS. On guest os on affected hardware the hashes is different every time:
hash on host os:
6facaf561ff4bcd7aa1440989cef519c *CD1.avi
hash on guest os:
706b35db57ab3ab9412fae7d594fab42 *CD1.avi
and more:
abf97dc1d02054ef6721418ac1fd6324 *CD1.avi

Please, don't post replies like "use network, use SMB etc." - it's complex
and unjustified setting up network on, e.g. FreeDOS booted from recovery CD!

Maybe, anybody knows, is it possible to solve this? how to tell this to
developers? I'm ready to be tester for this situation - my notebook ready for
you!

Thanks

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Related Messages

Re: Data corruption while using shared folders

Sent: 09/25/2008
From: "Bob Campbell" <(email address - cut out)>
Message:

"hex_messer" <(email address - cut out)> wrote in message
news:(email address - cut out)...

The answer is to use regular networking. Forget "shared folders". It is
NOT "complex and unjustified". The biggest problem is that you can not
copy a file larger than 4 GB using "shared folders". I found this bug the
hard way. You HAVE to use regular networking if you want reliable access.

Show quoted text

> For illustration of data corruption I use simple test sequence: calculate
> MD5 for a large file (e.g. film 700MB) on host os, and then a few times on
> guest OS. On guest os on affected hardware the hashes is different every
> time:
> hash on host os:
> 6facaf561ff4bcd7aa1440989cef519c *CD1.avi
> hash on guest os:
> 706b35db57ab3ab9412fae7d594fab42 *CD1.avi
> and more:
> abf97dc1d02054ef6721418ac1fd6324 *CD1.avi
>
> Please, don't post replies like "use network, use SMB etc." - it's complex
> and unjustified setting up network on, e.g. FreeDOS booted from recovery
> CD!

Re: Data corruption while using shared folders

Sent: 09/26/2008
From: hex_messer
Message:

"Bob Campbell" wrote:
....
You did not read my post really. Try to set up fully functional networking
(also with long names and large files) under clear DOS. Forget shared
folders? This suggestion equals to: "Forget MS VPC, forget MS virtualisation
solutions at all. Use VMWare, Bochs, Virtualbox... Don't bother us with your
little problems!"

I see, your way was really hard. You did not read my opinion about
correlation with CPU.

Show quoted text

>
> The answer is to use regular networking. Forget "shared folders". It is
> NOT "complex and unjustified".
> The biggest problem is that you can not
> copy a file larger than 4 GB using "shared folders". I found this bug the
> hard way. You HAVE to use regular networking if you want reliable access.
>

Re: Data corruption while using shared folders

Sent: 09/26/2008
From: (email address - cut out)
Message:

On Sep 26, 3:29=A0am, hex_messer <(email address - cut out)>
wrote:
=A0 It is
g
ion
our
ug the
ccess.

Last time I bothered with MS-DOS in VPC shared folders was
significantly slower in MS-DOS than Windows....it was so slow as to be
unuseable. I don't know what the situation is like today. But in that
case networking was definetly the way to go. It's also not that hard
to setup network in MS-DOS and if your lazy you can just download the
already created networking enabled boot disks that are out there (like
Bart's) and they do it all for you.

As for the "Forget MS VPC, forget MS virtualisation solutions".

If your talking about VPC/Virtual Server then you should forget about
them. The other virtualization solutions have long since passed them
by. It's like using Office 97 today instead of Office 2007. Sure
Office 97 will work but it may not be the best solution for your
needs.

BTW, shared folders with Vmware Workstation is very fast especially in
v6.5.

Show quoted text

> "Bob Campbell" wrote:
>
> ...
>
> > The answer is to use regular networking. =A0 Forget "shared folders". =
> > NOT "complex and unjustified".
>
> You did not read my post really. Try to set up fully functional networkin=
> (also with long names and large files) under clear DOS. Forget shared
> folders? This suggestion equals to: "Forget MS VPC, forget MS virtualisat=
> solutions at all. Use VMWare, Bochs, Virtualbox... Don't bother us with y=
> little problems!"
>
> > =A0The biggest problem is that you can not
> > copy a file larger than 4 GB using "shared folders". =A0 I found this b=
> > hard way. =A0 You HAVE to use regular networking if you want reliable a=
>
> I see, your way was really hard. You did not read my opinion about
> correlation with CPU.

Re: Data corruption while using shared folders

Sent: 09/26/2008
From: "Bob Campbell" <(email address - cut out)>
Message:

"hex_messer" <(email address - cut out)> wrote in message
news:(email address - cut out)...

I have set up networking in DOS. There are loads of tools to do this, even
accessing NTFS drives. It sounds like you are just lazy and/or don't know
what you are doing.

Good luck spinning your wheels when there are solutions available to your
problems.

Show quoted text

>
>
> "Bob Campbell" wrote:
> ...
>>
>> The answer is to use regular networking. Forget "shared folders". It
>> is
>> NOT "complex and unjustified".
> You did not read my post really. Try to set up fully functional networking
> (also with long names and large files) under clear DOS. Forget shared
> folders? This suggestion equals to: "Forget MS VPC, forget MS
> virtualisation
> solutions at all. Use VMWare, Bochs, Virtualbox... Don't bother us with
> your
> little problems!"

Re: Data corruption while using shared folders

Sent: 09/28/2008
From: hex_messer
Message:

I know, how to set up network under dos, how to access ntfs drives, how to do
other things I need in DOS, but
1) I ask for *solution* of described problem, not for workarounds;
2) i see no sense in setting up network in order e.g. just to boot from
recovery (e.g. based on freedos) disk and use norton ghost to expand
partition image, moreover ghost now needs a lot of memory...

You may think I really lazy, but remember, the lazyness push the progress
forward! (the wheel was found up by lazy people). And if you want to solve
some hard task in much effective way, let the lazy man to work over it -- he
founds up the best way to solve it!

As I see no *solution* possible, the discussion is closed.
Thanks!

p.s. I want to note, that, imho, the dialogs like
"q: how to use VPC in way ..."
"a: don't use VPC at all, better use <other product>, because..."
is not a good tone for well-educated people. This answers never helps in
such (non-trivial) situations.

"Bob Campbell" wrote:

Show quoted text

> "hex_messer" <(email address - cut out)> wrote in message
> news:(email address - cut out)...
> >
> >
> > "Bob Campbell" wrote:
> > ...
> >>
> >> The answer is to use regular networking. Forget "shared folders". It
> >> is
> >> NOT "complex and unjustified".
> > You did not read my post really. Try to set up fully functional networking
> > (also with long names and large files) under clear DOS. Forget shared
> > folders? This suggestion equals to: "Forget MS VPC, forget MS
> > virtualisation
> > solutions at all. Use VMWare, Bochs, Virtualbox... Don't bother us with
> > your
> > little problems!"
>
> I have set up networking in DOS. There are loads of tools to do this, even
> accessing NTFS drives. It sounds like you are just lazy and/or don't know
> what you are doing.
>
> Good luck spinning your wheels when there are solutions available to your
> problems.
>
>

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