Network performance degradation

Hi all,

i'm experiencing a network transfer speed instability problem.
My setup include a domain with two DC (Win2000 and Win2003 virtual machine
inside a Win2003 host), two NAS appliance from HP/Compaq (Win2000 and
Win2003) and two Win2003 member file server.
I make a daily backup copy of each machine to the other but it takes a very
long time even in apparently low network traffic condition (off-work hours).
I have tried to rebuild the DNS zone thinking the problem was with it but
without success. I have measured the network speed with the Qcheck tool that
report good speed values.

What should i do?

--

Roberto Bertucci

What are you using to backup this machine? A tape drive? Maybe the
tape drive is slowing you down.
What happens if you copy a large file(s) from one machine to the
other? Hard Drive to Hard Drive over the network. Slow?

Are you using microsoft backup utility or something else? What do the
logs say? Any missed files? Retries? Verification on?

Are you running any other jobs at night during the backup such as a
full virus scan? That would slow you down.


On Thu, 27 Apr 2006 07:36:02 -0700, Roberto Bertucci
<(E-Mail Removed)> wrote:

>Hi all,
>
>i'm experiencing a network transfer speed instability problem.
>My setup include a domain with two DC (Win2000 and Win2003 virtual machine
>inside a Win2003 host), two NAS appliance from HP/Compaq (Win2000 and
>Win2003) and two Win2003 member file server.
>I make a daily backup copy of each machine to the other but it takes a very
>long time even in apparently low network traffic condition (off-work hours).
>I have tried to rebuild the DNS zone thinking the problem was with it but
>without success. I have measured the network speed with the Qcheck tool that
>report good speed values.
>
>What should i do?

"Matt Scoff" wrote:

> What are you using to backup this machine? A tape drive? Maybe the
> tape drive is slowing you down.

I just copy files from the HD of one server to another.

> What happens if you copy a large file(s) from one machine to the
> other? Hard Drive to Hard Drive over the network. Slow?
>

I have observed thru the network performance monitor of the Windows task
manager that when the transfer operation begins the network card its used for
80-90% but after a variable period of time the usage goes near 0% and remains
low until the end of copy.

> Are you using microsoft backup utility or something else? What do the
> logs say? Any missed files? Retries? Verification on?
>

With the NTBACKUP i dont see network degradation, even with several Gigabyte
of data, but it is not useful to me because i need a replica of the files of
one server to the other.
There are no event log that seemed related to the problem.

> Are you running any other jobs at night during the backup such as a
> full virus scan? That would slow you down.

No
>
>
> On Thu, 27 Apr 2006 07:36:02 -0700, Roberto Bertucci
> <(E-Mail Removed)> wrote:
>
> >Hi all,
> >
> >i'm experiencing a network transfer speed instability problem.
> >My setup include a domain with two DC (Win2000 and Win2003 virtual machine
> >inside a Win2003 host), two NAS appliance from HP/Compaq (Win2000 and
> >Win2003) and two Win2003 member file server.
> >I make a daily backup copy of each machine to the other but it takes a very
> >long time even in apparently low network traffic condition (off-work hours).
> >I have tried to rebuild the DNS zone thinking the problem was with it but
> >without success. I have measured the network speed with the Qcheck tool that
> >report good speed values.
> >
> >What should i do?
>
>

Thanks for help
--

Roberto Bertucci