<p>The IBM Power6 8203-E4A (#5580) 2780 Controller w/Aux Write Cache</p>
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<p>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.</p>
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<p>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.</p>
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<p>Attributes provided: Disk Controller with auxiliary write cache</p>
<p>Attributes required: Two PCI-X slots within the same CEC or I/Ounit/drawer/tower</p>
<p>For 8203-E4A: The IBM Power6 8203-E4A (#5580)</p>
<p>Minimum required: 0</p>
<p>Maximum allowed: 36 (Initial order maximum: 0)</p>
<p>OS level required: IBM i V5R4 with V5R4M5 Machine Code, or later.</p>
<p>Initial Order/MES/Both/Supported: Supported</p>
<p>CSU: Yes</p>
<p>Return parts MES: Does not apply</p>
<p>Note: Not supported in CEC. System maximum of 24 under IBM i. Not supported under AIX or Linux.</p>
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