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GNU/Linux, IO performance problems

I have some problems with my system performance. As I was adviced here, I used sar: $sar -u 5 and found out that the problems are caused by a low HDD performance, as I supposed (high %iowait). ...
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User mounted secondary drive as /var

I have a drive that someone else mounted using mount /dev/sdc1 /var At some point they complained that all the data was missing Now: mount /dev/sdc1 /media/testdrive df -h shows 130GB used du -h ...