IBM 2778 PCI RAID Disk Controller 21P3735 21P7816 53P4802
Custom Field 2 (EAN): 53P4802
Custom Field 4 (MPN): 21P7816
IBM 2778 PCI RAID Disk Unit Controller 21P3735 21P7816 53P4802
The IBM 2778 can have 21P3735, 21P7816 or 53P4802 part numbers, and needs to have its 44L0313 cache battery replaced regulary. The 44L0313 is the IBM Cache Battery Pack for the IBM 2763, 2778, 2782, 5703, 5709 and 5727; the IBM 44L0313 Cache Battery Pack can also have 42R5070, 42R5069, 22R2717 and 04N2496 part numbers.
The IBM 2778 is Ultra2 SCSI capable when installed in a 5065 PCI Storage Expansion Tower or 5066 1.8m I/O Tower. The IBM 2778 has a maximum compressed cache size of 104MB, which provides RAID5 protection and compression for internal disk units. In addition to providing RAID5 protection for disks, the IBM 2778 is also designed to work as a high performance controller for disks protected by system mirroring or disks with no protection.
The IBM 2778 controller supports a maximum of 15 drives. A minimum of four drives of the same capacity are needed for a valid RAID 5 configuration. A maximum of three arrays are allowed per controller, with a maximum of ten drives allowed per array. All drives in an array must be of the same capacity. The IBM 2778 also supports 4331 and 6831, 1.6GB Read Cache Device, which provides increased performance. Larger read cache is supported only when the IBM 2778 is NOT in compression mode.
The IBM 2778 is only available in refurbished condition as of October 1, 2004.
The IBM 2778 also supports combinations of CD-ROM and internal tape units. When placed in a 5065 PCI Storage Expansion Tower or 5066 1.8m I/O Tower, the 2778 can support up to two tape units and CD-ROMs, in any combination. The 2778 supports both compression and non-compression modes. The mode of operation is determined by a hardware jumper. 2778 is shipped with the jumper set for non-compression mode. By moving the jumper, the controller will function in compression mode.
Prerequisites: 503X Migration Tower 1, 5064, 9364, or 5065 and 5066 Towers with an available slot under a base or feature 2824 controller. Must be installed in a High-Speed PCI card slots. OS/400 V5R1, or later, is required.
Supported on the following systems: 600, 620, 640, 650, 720, 730, 740, 810, 820, 825, 830, 840, 870, 890