IBM AS/400e

Magnetic Media Controllers
394 AS/400e System Handbook
This feature requires OS/400 V4R2 or later.
#2726 PCI RAID Disk Unit Controller Ultra SCSI
The #2726 PCI RAID Disk Unit Controller provides unprotected, mirrored, or RAID-5
protection for internal disk units. It includes a 4M write cache for better performance and
improved device utilization. The #2726 also supports one CD-ROM drive and one internal
tape unit when placed in the system unit. When placed in the #5064/#9364 System Unit
Expansion, the #2726 can support up to three internal tape units.
The #2726 controls Ultra, Fast Wide, and Fast Narrow SCSI disk units located in the System
Unit and the #5064/#9364 System Unit Expansion with Expansion Unit for PCI cards #9329.
The Ultra SCSI disks provide the best performance when attached to the #2726. These Ultra
SCSI disks are 17.54 GB Disk Unit #6824, 8.58G Disk Unit #6813, 4.19G Disk Unit #6807,
1.96 GB Disk Unit# 6806, and their base disk equivalents and the #1334 (17.54G), #1333
(8.58 GB), #1337 (4.19 GB), and #1336 (1.96 GB) Disk Unit Migration Kits. These are all
supported in the System Unit and #5064/#9364 System Unit Expansion. The #2726 also
controls migrated disks that are not Ultra SCSI. In that case, the disks do not perform at Ultra
SCSI speeds.
The #2726 PCI RAID Disk Unit Controller supports a maximum of 15 one or two-byte disk
units. A minimum of four disk units of equal capacity are required to implement RAID-5
protection. A maximum of 10 disk units per RAID-5 array are supported. Parity information
can be spread across four or eight disk units. A maximum of three RAID-5 arrays are
supported on one #2726. Disk units not supported in a RAID-5 array can be attached to the
#2726 in either unprotected or a mirrored environment.
Concurrent maintenance of disks attached to the #2726 is only supported if the disks are part
of a RAID array or are mirrored.
The supported internal tape drives include:
• 1.2G ¼-inch Cartridge Tape Unit Kit, #1349
• 2.5G ¼-inch Cartridge Tape Unit Kit, #1350
• 13G ¼-inch Cartridge Tape Unit Kit, #1355
• 7G 8mm Cartridge Tape Unit Kit, #1360
• 2.5G ¼-inch Cartridge Tape Unit, #6481
• 4G ¼-inch Cartridge Tape Unit, #6482
• 13G ¼-inch Cartridge Tape Unit, #6485
• 16 G ¼-inch Cartridge Tape Unit
• 25G ¼-inch Cartridge Tape Unit, #6486
• 7G 8mm Cartridge Tape Unit, #6490
The #2726 requires OS/400 V4R1 or later. It occupies one High Speed PCI card slot. It is
supported on the 9406 Model 720 only. A maximum of one #2726, #2740, #2741, or #9728