56 iSeries and AS/400e System Builder
2.5 Supported upgrades for Models SB2 and SB3
All upgrades to, from, and within the SB2 and SB3 systems are withdrawn from marketing.
Refer to the Upgrade topic in the Find and Compare Tool (FACT) at the following Web site to
determine the supported upgrade paths for a given processor:
http://www-919.ibm.com/servers/eserver/fact/
#9778 #9778 Base PCI RAID Disk Unit Controller–104 MB Cache
The #9778 is an Ultra2 SCSI controller with a 104 MB write-cache that provides RAID-5 protection and compression for
internal disk units and supports internal tape units and CD-ROM units. The #9778 supports both compression and
non-compression modes. The mode of operation is determined by a hardware jumper. The #9778 is shipped in
non-compression mode. By moving the hardware jumper, the controller functions in compression mode. In addition to
providing RAID-5 protection for disks, the #9778 is also designed to work as a high performance controller for disks
protected by system mirroring or disks with no protection. The #9778 also supports #4331 1.6 GB Read Cache Device,
which provides increased performance. The #4331 1.6 GB Read Cache Device is supported only when the #4748/#9748
is not in compression mode.
A minimum of four disk units of the same capacity are needed for a valid RAID-5 configuration. A maximum of four arrays
are allowed per controller, with a maximum of 10 disk units allowed per array. All disk units in an array must be of the same
capacity. Parity is spread across four disk units for arrays of four to seven disk units. Parity can be spread across either four
or eight disk units for arrays of eight to 10 disk units. For systems started with eight to 10 disk units in an array, the parity
for that array is spread across eight disk units. For systems that are started with less than eight disk units in an array and
later upgraded to eight, nine, or 10 disk units, the RAID function must be stopped and then started before the parity is
spread across eight disk units.
The #9778 controls up to two removable media devices (internal tape, CD-ROM, or DVD-RAM).
Requires long PCI card slot. Only one allowed in system unit and is mutually exclusive with #9748.
Minimum operating system level: OS/400 V5R1
The #9778 is a Customer Install Feature.
The #9778 was withdrawn from marketing on 21 November 2003.