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It seems that (but I'm not completely sure), that when I'm copying files from gigabit network to HDD, I can't use full potential of the network which in my case is about 60 MB/s, because HDD writing is so slow like lower than 10 MB/s, and also it's slowing down the whole system which becomes pretty much unresponsive, almost impossible to work with.

Copying files to samba share residing at Ubuntu machine, connected to share from Windows 7, I'm completely sure my network equipment is OK, and there's no CPU intensive process on Ubuntu except smbd getting about 10-20% from time to time which I think is OK. Something here is burried deep I think, maybe even in kernel.

Already tried to switch from AHCI to compatibility mode, and turning acpi on and off - nothing helped. So it's like HDD buffer is full and emptying slowly while machine is sluggish, load is about 3 to 4.

Somebody experienced the similar problems? Some help on troubleshooting process and identifying the cause would be helpful too :)

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I forgot to mention... but I think it's not related. Disk utility shows Warning: The partition is misaligned by 3584 bytes. This may result in very poor performance. Repartitioning is suggested. I did my partitioning with GParted. I say it's not related because if I copy files between pertitions on the same disk, everything appears to be OK, so I think it's network related... – pyc Apr 16 '12 at 10:01
Is the partition NTFS? If yes, then that's the problem :) Switch to ext to have better performances. – dadexix86 Apr 16 '12 at 11:22
I was right... Misaligned partition was the problem. The solution was to delete the partition and make it again in GParted using "Align to MB" option. Now the performance is how it should be, hope this thread helps someone even if I was talking just to myself ;) – pyc Apr 16 '12 at 14:40
Please post your solution as an answer so we can help the next person who has this problem! – Jorge Castro Apr 22 '12 at 19:24

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