Use mini-SAS cables (SFF-8088) to connect the host bus adapters (HBAs) to the controller ports.
From the CLI: reset storageArray (after backing up). From the manual: Press and hold the "Mute" and "Identify" buttons on the front panel for 10 seconds during boot.
The (often bundled with the manual) is non-negotiable. Running old firmware on a DS3512 can lead to the infamous "lockup" bugs.
The DS3512 is a 2U rack-mount enclosure that supports up to twelve 3.5-inch SAS drives. It can be configured with single or dual controllers for high availability.
The IBM System Storage DS3512 manual is more than a technical guide; it is a blueprint for the "middle era" of enterprise data management. Released as part of the DS3500 series, the DS3512 represented a critical jump toward 6Gbps SAS (Serial Attached SCSI) technology, and its documentation serves as a primary text for understanding the rigorous demands of high-availability computing.