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0e1f616
(Get the code!)
I may be seeing the same problem, but I am not sure.
I have a new Thecus N5200XXX NAS and when I read via NFS I get all transfers to/from the NFS mount blocked after 5-7GB typically, but for writing I got 47GB today (and managed to copy a 202GB file earlier). However, I don't know if this is a Thecus issue or Ubuntu/Linux issue.
I see it with both my 64-bit 10.04.02 LTS installation (kernel 2.6.32-32-generic #62-Ubuntu SMP Wed Apr 20 21:52:38 UTC 2011 x86_64 GNU/Linux) and my 32-bit 10.04.2 LTS installation with the 'proposed' updates with the 2.6.32-33-generic #69-Ubuntu SMP Mon Jun 27 15:36:47 UTC 2011 i686 GNU/Linux kernel (same PC dual-boot).
I don't seem to see it on my home PC (similar 10.04 LTS 32-bit 'proposed' kernel and the older Thecus N5200pro NAS) which is why initially I assumed it was a Thecus issue.
What I do see is I can access the NAS via CIFS and its web interface at the same time NFS is blocked, and can access NFS mounts on other servers as well.
There are no odd high CPU loads on PC client or NAS server, or syslog messages on the PC.
While this may be unrelated, I see others are still having problems after the fix has apparently been released so thought it may be of interest.