Base Pci Disk Unit Controller Ultra Scsi - IBM AS/400e User Handbook Manual

Magnetic Media Controllers
The mode of operation is determined by a hardware jumper, which is in the non-compression
mode position when shipped. By moving the hardware jumper, the controller will function in
compression mode.
In addition to providing RAID-5 protection for disks, the #4748/#9748 is also designed to work
as a high-performance controller for disks protected by system mirroring or disks with no
protection. In the RAID-5 configuration, disk unit protection is provided at less cost than
mirroring and with greater performance than system checksums.
The #4748/#9748 controller supports a maximum of 18 drives. A minimum of four drives of
the same capacity are needed for a valid RAID-5 configuration. A maximum of four arrays are
allowed with a maximum of 10 drive allowed per array. All drives in an array must be of the
same capacity.
The #4748/#9748 also supports two removable media devices. This feature supports the
#4331 1.6 Gb Read Cache Drive for increased performance. The Read Cache Drive #4331 is
only supported in non-compression mode.
This feature also supports Hot Pluggable.
Refer to the card placement rules for supported systems and valid slots.

#9728 Base PCI Disk Unit Controller Ultra SCSI

The #9728 Base PCI Disk Unit Controller is the base controller for the system unit. It is an
Ultra SCSI controller, which provides mirroring or unprotected support for up to five disks
(four on the Model 170) located in the system unit. The #9728 does not include any write
cache and it does not support RAID. As well as five disks, it also supports the internal
CD-ROM drive and one internal tape unit.
The #9728 controls Ultra, Fast Wide, and Fast Narrow SCSI disk units located in the system
unit. The Ultra SCSI disks provide the best performance when attached to the #9728. These
Ultra SCSI disks are 17.54G Disk Unit #6824, 8.58G Disk Unit #6813, 4.19G Disk Unit #6807,
1.96G Disk Unit #6806, and their base disk equivalents and the #1334 (17.54G), #1333
(8.58G), #1337 (4.19G) and #1336 (1.96G) Disk Unit Migration Kits. The #9728 also controls
migrated disks that are not Ultra SCSI. In that case, the disks do not perform at Ultra SCSI
speeds.
The Base PCI Disk Unit Controller supports a maximum of five one- or two-byte disk units. It
requires OS/400 V4R1 or later, and occupies one High Speed PCI card slot. It is supported
on the 9406 Models 170 and 720 only. It is represented in the rack configuration list as CCIN
2728. A maximum of one #2726, #2740, #2741, or #9728 can be installed in the system unit.
If RAID is to be implemented or more than five disk units are required in the system unit,
#2726, #2740, or #2741 PCI RAID Disk Unit Controller should be ordered in place of the
#9728.
399
Magnetic Media Controllers