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Magnetic Media Controllers
The #2809/#2824 PCI Feature Controller or the base PCI LAN/WAN Workstation IOP in the
#5065 Storage/PCI Expansion Tower/#5066 1.8 I/O Tower is a prerequisite for the #2729.
OS/400 V4R2 or later is required for the #2729 to support the 3995 Optical Library
Dataserver.
#2740 PCI RAID Disk Unit Controller
The #2740 is functionally equivalent to the #2726 PCI RAID Disk Unit Controller. However,
the #2740 can only be located in the System Unit. It cannot be located in the System Unit
Expansion #5064/#9364. The #2740 is supported on the 9406 Models 170 and 720 only. The
#2740 supports a maximum of 10 one- or two-byte disk units. A maximum of two RAID-5
arrays are supported on one #2740. A maximum of one #2740, #2726, #2741, or #9728 can
be installed in the system unit. The #2740 does not offer support for compression. However, if
only a maximum of 10 disks are required and there is no requirement for compression, the
#2740 should be ordered.
Concurrent maintenance of disks attached to the #2740 is only supported if the disks are
mirrored or part of a RAID array. Otherwise, the #2740 offers the same support as the #2726.
Refer to "#2726 PCI RAID Disk Unit Controller Ultra SCSI" on page 394 for more information.
The #2740 requires OS/400 V4R2 or later.
#2741 PCI RAID Disk Unit Compression Controller
The #2741 is functionally equivalent to the #2726 PCI RAID Disk Unit Controller. See "#2726
PCI RAID Disk Unit Controller Ultra SCSI" on page 394 for a full description of #2726. The
#2741 supports a maximum of 15 disk units but offers an enhancement over the #2726 in that
it supports data compression when used with OS/400 V4R3. The #2741 requires V4R2 or
later of OS/400. For all new orders with V4R2 or later, the #2741 will be ordered in place of
the #2726.
Concurrent maintenance of disks attached to the #2741 is only supported if the disks are
mirrored or part of a RAID array.
The #2741 is supported on the 9406 Model 170 and 720 only. A maximum of one #2741,
#2726, #2740, or #9728 can be installed in the system unit and one #2741 or #2726 in the
#5064/#9364 System Unit Expansion with #9329 Expansion Unit for PCI cards. If only a
maximum of 10 disks is required and there is no requirement for compression, the #2740 can
be ordered instead of #2741.
#2748 PCI RAID Disk Unit Compression Controller
The #2748 is an Ultra2 SCSI disk and tape controller with a 26 MB write-cache that provides
RAID-5 protection for internal disk units. In addition to RAID, the #2748 also offers DASD
compression capabilities. The #2748 IOA is shipped with compression disabled. Compression is
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