<p>(#5580) 2780 Ctlr w/Aux Write Cache</p>
<p>Provides a disk controller with auxiliary write cache to improve cache data redundancy. The #5580</p>
<p>includes a #2780 PCI-X Ultra4 RAID Disk Controller and a secondary IOA with 757MB of auxiliary</p>
<p>maximum compressed write cache. The #2780 and the secondary IOA each require one PCI-X slot</p>
<p>and must be installed together in the same CEC or I/O unit/drawer/tower. The #2780 and the auxiliary</p>
<p>write cache IOA are connected by a SCSI cable (provided). Feature #2780 will not appear on IBM</p>
<p>ordering, shipping, or inventory documentation.</p>
<p>The connecting SCSI cable is attached to port four of the #2780, reducing the number of SCSI buses</p>
<p>that support disk drives from four to three. The reduction of SCSI buses may also reduce the number</p>
<p>of disk drives supported by the #2780, depending on the CEC or I/O unit/drawer/tower in which the</p>
<p>#2780 is installed. No disk drives are driven by the auxiliary write cache IOA.</p>
<p>Supported on the following systems: 520, 550, 570, 595</p>
