I have Samba 3.5.6 with the ACL patch running and I was in the process of creating a large ~80GB RAR file on the share from my PC, when I encountered several messages near the end of the write. The messages indicated by WinRAR were: no disk space remaining or write error. The computer and share connection were active for a long period of time (~1 day) which may have contributed to the problem. I will be checking my Samba logs tonight, though I am interested in other debugging steps and whether I should configure my network/Samba differently for more stable sessions.