However after about a 15Gb backup from SQL 2005 server onto a Windows 7 share, the Windows 7 workstation seemed to loose its visibility from any of the Windows 2003 servers. (The other Windows 7 machines could still see the share).
A reboot solved the issue, until I tried to backup again!
Looking in the event log, I found memory errors showing as Non-Paged pool problems.
After a lot of searching, I came across the article below - it would appear that from the old SysInternals Site there used to be an article called "Tunining Workstations for Server-Like Loads". Microsoft seem to have "tidied up" these old articles and I couldnt find any links to the references shown on Technet, however if you make the registry changes to a Windows 7 machine, it seems a lot happier pretending to be a backup file server overnight.
Set the following registry to key to 1
HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\LargeSystemCache
and set the following registry key to ‘3′:
Reboot and enjoy!
Event ID 2017 and 2021 - microsoft.public.windows.vista.networking_sharing Google Groups