/dev/sda:
 Timing cached reads:   1084 MB in  2.00 seconds = 541.78 MB/sec
 Timing buffered disk reads:  172 MB in  3.03 seconds =  56.73 MB/sec

Output of "hdparm -I ..." is attached.

The machine can be accessed only remotely at the moment, I can't check
removing the DVD, but I think it's totally another bus so it shouldn't
cause problems. Also please note that eg copying file from a file
through the network is quite OK. The slowness can be seen if there are
concurrent I/O requests when the whole machine is painfully slow. One
I/O itself (like otherwise idle machine and copying a file by
sequentially reading it and eg streaming it through the network) is OK
(in speed) but any other task is painfully slow, mouse cursor stops for
seconds, if I try to execute even a plain 'ls' command it can wait for
seconds or even more, etc. Also, I know it's hard to define as a
problem, but I feel this issue is becoming more and more serious one
with every newer ubuntu versions, but I know it's quite subjective thing
to just say. Thanks.

** Attachment added: "hdparm.txt"
   http://launchpadlibrarian.net/17595063/hdparm.txt

-- 
Disk I/O is very slow, system freezes for seconds
https://bugs.launchpad.net/bugs/268588
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