Intel RAID controller RS2MB044 + Intel RES2SV240 expander = doesn't work

The following setup doesn't work:

  • Intel RAID controller RS2MB044,
  • Intel RES2SV240 expander,
  • 16 WD30EFRX (WD Red) hard drives.
The demonstrated symptoms are similar to those described here. In our experience slowdown appears with both a RAID6 and RAID5. Perhaps, there is some incompatibility between controller, expander, and drives in any of possible combinations.

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