#2780 PCI-X Ultra4 RAID Disk Ctrl replaces 2757
(#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
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