The ThinkSystem RAID 930-8e External RAID Adapter is a high-performance 12 Gbps SAS RAID-on-chip (ROC) adapter for connectivity to external disk enclosures. The adapter comes standard with 4 GB of cache, supports RAID levels 0, 1, 10, 5, 50, 6 and 60, and includes an extensive list of RAS and management features.