2741 Pci Raid Disk Unit Compression Controller; 9728 Base Pci Disk Unit Controller Ultra Scsi - IBM i series Handbook

I/O Adapters and Controllers
Refer to "#2726 PCI RAID Disk Unit Controller Ultra SCSI" on page 311 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 311 for a full description of the #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 is 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.
A maximum of one #2741, #2726, #2740, #2748, 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
enabled by moving a jumper on the IOA. The #2748 supports Extended Adaptive Cache with
restriction that compression must not be active on the same #2748 subsystem.
The #2748 is designed to control Ultra2, Ultra, and Fast Wide SCSI disk units. It supports up
to 15 disk units, one CD-ROM, and one internal tape unit. In addition to RAID-5 and
compression, the #2748 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 a lower cost than mirroring. This feature supports Concurrent
DASD Add/Maintenance. Note these additional points:
• The #2748 is a replacement for #2741
• High Speed PCI Card slots required: One
• This feature is CE installation only

#9728 Base PCI Disk Unit Controller Ultra SCSI

The #9728 Base PCI Disk Unit Controller is the base controller. It is an Ultra SCSI controller,
which provides mirroring or unprotected support for up to five disks. The #9728 does not
include any write cache, and it does not support RAID. It supports the internal CD-ROM drive
and one internal tape unit, as well as five disks.
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iSeries Handbook