I had a problem with a sata disk under heavy I/O ... response time
degraded when loading/starting new applications (... until the disk
finally freezed).

I solved my problem by fine tunning the "pdflush" parameters...

Monitor the "Dirty" values in " cat /proc/meminfo" ... if the values
remain high (... are not cleaned frequently enough) then the problem
might be the "pdflush" configuration.

If the problem is the "pdflush" then check this link :
https://bugs.launchpad.net/ubuntu/+bug/270794/comments/12

... I hope it helps.

-- 
Very poor desktop response (high latency) during I/O-load with SATA+NCQ
https://bugs.launchpad.net/bugs/343371
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