@ Stefan

I have two harddisk in my client machine. The NFS freeze happens with both hdds.
One hdd (sdb) is a Seagate Barracuda 7200.10 family (ST3250410AS), the other 
(sda) is a solid state disk (it's labeled as 'sagitta' but I guess that means 
more or less 'no name'). The operating system is installed on the solid state 
disk.
My Gigabyte Mainboard has (as far as I know) an Intel Chipset, so I guess it 
also should have an Intel SATA-Controller. But I'm not 100% sure in this point.

When considering that a faulty harddisk is the problem (I also considered this 
at one point) you should keep in mind the following things:
- The problem happens with two totally different harddisks
- The problem happens exactly since the day I installed 10.10 instead of 8.04
- Those suspicious error messages were only shown in one (or two) of five test 
runs.

So if it's a harddisk problem it was probably also 'introduced' with
10.10

I'm now gonna try two things and tell you afterward the results.

1. Copy big files between the local disks (to rule out that the problem is 
possibly totally unrelated to NFS)
2. Attach an external HDD via USB to the client machine and try to copy from a 
NFS share to this external disk (to see if it's related to the mainboard's 
SATA-Controller)

-- 
System lock-up when receiving large files (big data amount) from NFS server
https://bugs.launchpad.net/bugs/661294
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