IBM 3531-1RX server / storage / networking hardware Server Hardware / Parts

The IBM 3531-1RX is a genuine IBM Netfinity EXP300 storage expansion unit, a 14-bay disk array expansion enclosure for IBM’s Netfinity server range, as stated directly in IBM’s own part description. The EXP300 provides additional hot-swap SCSI or SSA disk bays beyond a Netfinity server’s internal capacity, connecting via an external storage interface to extend usable disk capacity for database, file-serving or general storage workloads on Netfinity-based systems. As one of IBM’s earlier rack-mount storage expansion designs, the EXP300 predates IBM’s later xSeries and System x storage ranges, and genuine units are now sought mainly by sites maintaining legacy Netfinity infrastructure or collectors of that hardware generation rather than for new production deployment. Buyers should confirm their Netfinity server model and the expansion unit’s exact interface type (SCSI vs SSA) before ordering, since IBM offered EXP300 variants across both interfaces. Tech-Star is UK-based and ships worldwide.