#2780 PCI-X Ultra4 RAID Disk Ctrl replaces 2757

Brand: IBM AS400 iSeries

Model Number: 2780-9406

(#5580) 2780 Ctlr w/Aux Write Cache

Provides a disk controller with auxiliary write cache to improve cache data redundancy. The #5580

includes a #2780 PCI-X Ultra4 RAID Disk Controller and a secondary IOA with 757MB of auxiliary

maximum compressed write cache. The #2780 and the secondary IOA each require one PCI-X slot

and must be installed together in the same CEC or I/O unit/drawer/tower. The #2780 and the auxiliary

write cache IOA are connected by a SCSI cable (provided). Feature #2780 will not appear on IBM

ordering, shipping, or inventory documentation.

The connecting SCSI cable is attached to port four of the #2780, reducing the number of SCSI buses

that support disk drives from four to three. The reduction of SCSI buses may also reduce the number

of disk drives supported by the #2780, depending on the CEC or I/O unit/drawer/tower in which the

#2780 is installed. No disk drives are driven by the auxiliary write cache IOA.

Supported on the following systems: 520, 550, 570, 595