not have write cache. (The write performance of RAID 5 and RAID 6 can be poor on adapters that do not
provide write cache. Consider using an adapter which provides write cache when using RAID 5 or RAID
6.)
The adapter can address up to 48 SAS disk drives, although the actual number of drives in a system is
subject to the physical placement limitations of the system. Externally attached devices are designed to
run at a data rate of 1.5 Gbps for serial ATA (SATA) devices, and 3 Gbps for SAS devices. This card
supports RAID and non-RAID DASD, tape, and optical devices. This adapter supports the multi-initiator
and high availability configurations in AIX and Linux. IBM i does not support feature 5901 in
multi-initiator and high availability configurations.
Important: See the SAS RAID controllers for AIX, SAS RAID controllers for Linux, or SAS RAID
controllers for IBM i topics for more information and important considerations for multi-initiator and
high availability or dual storage IOA configurations
The FC 5278 supports SAS SFF disk drives located in a PCIe 12X I/O Drawer or SAS disk drives located
in an EXP 12S Disk Drawer or SAS disk drives located in a supported POWER system unit (split disk
backplane).
Specifications
Item Description
Adapter FRU number
44V4852 (Designed to comply with RoHS requirement)
I/O bus architecture
PCIe
Slot requirement
One available PCIe x8 slot
Cables
SAS device attachment requires specific cables that are provided with the subsystem or device
features being attached. Special cabling is required for multi-initiator and high availability
configurations. See Serial attached SCSI cable planning.
Figure 58. PCIe Dual - x4 SAS adapter
172 Power Systems: Managing PCI adapters for the IBM Power 710 Express or the IBM Power 730 Express
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