iSeries I/O adapters and controllers 379
Draft Document for Review October 18, 2004 5486IOA.fm
The #2782 and #0619 Linux Direct Attach - #2782 PCI-X RAID Disk Unit
Controller were
withdrawn from marketing on 01 January 2004. The #5703
PCI-X RAID Disk Unit Controller is the recommended replacement for the #2782.
The #0628 is the recommended replacement for the #0619.
The #2782 is
withdrawn from marketing in October 2004. The recommended
replacement is the xxx.
#4748/#9748 Base PCI RAID Disk Unit Controller
The #4748/#9748 Base PCI RAID Disk Unit Controller is an Ultra2 SCSI disk unit
controller with a 26 MB write-cache that provides RAID-5 protection for internal
disk units and supports internal tape, CD-ROM, and DVD devices. The
#4748/#9748 supports both compression and non-compression modes. 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 functions 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 a lower 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 is needed for a valid RAID-5 configuration. A
maximum of four arrays is allowed, with a maximum of 10 drives allowed per
array. All drives in an array must be of the same capacity.
The #4748/#9748 also supports two removable media devices.
The #4748 feature is hot pluggable.
When used as a Direct Attached Adapter for Linux, order the #0605 in place of
the #4748.
The #4748 is
withdrawn from marketing on 21 November 2003. The
recommended replacement is a #2757 PCI-X Ultra RAID Disk Controller.
Number of units in the array Number of units parity is spread across
32
4 - 7 4
8 - 12 8
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