Hot answers tagged performance
The technique you want is called scientific method. With scientific method and some monitoring tools, you can diagnose the issue and take corrective action.
The control disk is connected to a SATA port built into the motherboard. As stated, the disks experiencing the journal flush time out issues are connected to the PERC, the same controller that the 'problematic' Toshiba's are connected to. The PERC 310 is only a basic hardware raid card. It's CPU is probably easily overwhelmed, either that or there is ...
You can use sysdig: sudo apt-get install sysdig; sysdig -c topfiles_bytes; There's also an interactive (top-like) terminal program that might be useful in your case. csysdig;
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