72 iSeries and AS/400e System Builder
#2729 #2729 PCI Magnetic Media Controller
The #2729 provides SCSI attachment for one 3490E C11/C22/C1A/C2A with feature #5040, 3590 Exx/Bxx, 3490E Exx,
3490E Fxx, 3494 D1x or L1x, 3570, 3590, 7208, 9348 or 9427 Tape Subsystem models or 3995 Optical Library
Dataserver (C4x).
Prerequisite: #7102 System Expansion Unit
High-speed PCI slots required: One
Maximum: Two
The #2729 is a Customer Install Feature.
#2748 #2748 PCI RAID Disk Unit Controller — 26 MB Cache (RAID/Mirrored/Unprotected)
The #2748 SCSI disk and tape controller with a 26 MB write-cache provides RAID-5 protection and DASD compression
capability for internal disk units, and supports internal tape and CD-ROM units. The #2748 controls Ultra and Fast Wide
SCSI disk units installed in the base system and the #7102 System Expansion Unit. In addition to providing RAID-5 and
compression, the #2748 works as a high-performance controller for disks protected by system mirroring or disks with no
protection.
The #2748 supports a maximum of 10 disk units. A minimum of four disk units of the same capacity is needed for a valid
RAID-5 configuration. A maximum of two arrays is allowed per controller, with a maximum of 10 disk units 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. For systems started with eight disk units in an array, the parity for that array is spread across eight disk units. For
systems 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 #2748 supports one CD-ROM and one internal tape unit, and concurrent DASD add/maintenance.
The #2748 also supports the #6831 1.6 GB Read Cache Device, which is mutually exclusive with DASD compression.
Required: Disk controller PCI card slot C07
Maximum: One
#2763 #2763 PCI RAID Disk Unit Controller — 10 MB Cache (RAID/Mirrored/Unprotected)
The #2763 is an Ultra2 SCSI controller with a 10 MB write-cache that provides RAID-5 protection for internal disk units
and supports up to two removable media devices (internal tape units and CD-ROM units). The #2763 is designed to
control Ultra, Fast Wide, and Fast Narrow SCSI disk and tape units that are installed in the base system unit and the
#7102 System Expansion Unit. In addition to providing RAID-5 protection for disks, the #2763 is also designed to work
as a high performance controller for disks protected by system mirroring or disks with no protection. In a RAID-5
configuration, disk unit protection is provided at less cost than mirroring, and with better performance than system
checksum.
The #2763 controller supports a maximum of 10 drives. A minimum of four drives of the same capacity are needed for a
valid RAID-5 configuration. A maximum of two arrays is allowed with a maximum of a 10 drives allowed per array. All
drives in an array must be of the same capacity. Parity is spread across four drives for arrays of four to seven drives. Parity
can be spread across either four or eight drives for arrays of eight to 10 drives. For systems started with eight to 10 drives
in an array, the parity for that array is spread across eight drives. For systems that are started with less than eight drives
in an array and are later upgraded to eight, nine, or 10 drives, the RAID function must be stopped and then re-started
before the parity is spread across all eight drives.
Parts are included with the #2763 that are installed in the base system unit to support Concurrent DASD
Add/Maintenance. The #2763 does not support integrated hardware disk compression. It does not support the #6831 1.6
GB Read Cache Device.
The #2763 is selected automatically as the default PCI Disk Unit Controller when five or more DASD files are ordered.
Required: Disk controller PCI card slot C07
Minimum operating system level: OS/400 V4R5
The #2763 is a Customer Install Feature.
The #2763 was withdrawn from marketing on 21 November 2003 for new orders. Conversions to feature #2763 remain
available. The #5703 PCI-X RAID Disk Unit Controller is the recommended replacement.
