IBM Power 570 and IBM Power 595 (POWER6 ... - IBM Redbooks

#5590 #5590 (2780) Controller with Aux Write Cache
Provides a disk controller with auxiliary write cache to improve cache data redundancy. #5590 includes a
#2780 PCI-X RAID Disk Controller with 757 MB of write cache and a secondary IOA with 1.5 GB 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 system unit or I/O unit/drawer/tower. #2780 and the auxiliary write cache
IOA are connected by the provided SCSI cable. 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 can also reduce the number of disk drives
supported by the #2780, depending on the system unit or I/O unit/drawer/tower in which the #2780 is installed.
No disk drives are driven by the auxiliary write cache IOA.
Attributes provided: Disk Controller with auxiliary write cache
Attributes required: Two PCI-X slots within the same system unit or I/O unit/drawer/tower
For 9117-MMA (#5590)
► Minimum required: 0
► Maximum allowed: 100 (Initial order maximum: 0)
► OS level required: IBM i 5.4 with V5R4M5 machine code or later
For 9119-FHA (#5590)
► Minimum required: 0
► Maximum allowed: 180 (Initial order maximum: 0)
► OS level required:
– IBM i 5.4 with V5R4M5 machine code
– IBM i 6.1 or later
Initial Order/MES/Both/Supported: Supported
CSU: Yes
Return parts MES: No
Chapter 4. Feature descriptions and related information 421