Z Series Workstation - Detecting and Fixing a Hard Drive Failure in the RAID Controller Utility | HP® Support
604815-001-HIGH P HP SAS CONTROLLER LSI 9260-8I 6GB/S PCI-E 2.0 X8 INTERNAL 2 MINI SAS SFF-8087 8 PORT SATA / SAS ROC CARD RAID CONTROLLER FOR HP Z400 / Z420 / Z600 /
Solved: Z420 Workstation troubleshooting in Install Windows - HP Support Community - 5580870
HP Z420 hardware RAID 1 configuration after OS instalation - HP Support Community - 6694253