mdadm RAID5 to RAID6 migration

mdadm makes raid management, even tasks that seem like they could be very complicated very easy. The following demonstrates setting up a (5) disk RAID5 array, and then migrating to a (10) disk RAID6 array.

HP Smart Array p410 Controller Tuning

We have a number of HP Servers at work, and I’ve been less than impressed with their slow throughput with stock parameters. One of our DL580’s has (10) 72GB 15K SAS drives attached to an HP Smart Array controller and could only do around 40 MB/s with the stock configuration. Here’s what I did to speed it up.