The IBM Power6 8203-E4A (#5903) PCIe 380MB Cache Dual - x4 3Gb SAS RAID Adapter
The #5903 PCIe 380MB Cache Dual - x4 3Gb SAS RAID Adapter is a short, full high form factor adapter which supports the attachment of SAS disk and SAS Solid State Drives using a pair of mini SAS 4x connectors. Write cache can provide an I/O performance boost even if RAID 5/6/10 is not used. From a high level perspective, except for having a larger write cache, it is very similar to the #5902 PCI-X SAS adapter and provides a high-performance connection to SAS devices. Two #5903 provides for mirrored write cache data and mirrored RAID parity footprints between the adapters for superior availability. The #5903 is installed in pairs allowing for redundancy of the write cache. If the #5903 pairing is broken, then write cache is disabled.
The #5903 supports SAS SFF disk drives located in a PCIe 12X I/O Drawer or SAS disk drives located in an EXP 12S Disk Drawer. AIX/ Linux formatted SAS drives can be attached and RAID 0, RAID-5, RAID-6 and RAID 10 are supported. CCIN number for #5903 is 574E.