6533 Raid Disk Unit Controller (4M Cache) Ultra Scsi Compress. Spd275 - IBM AS/400e User Handbook Manual

I/O Adapter
The #6532 controls Ultra, Fast Wide, and Fast Narrow SCSI disk units located in the #5058
Storage Expansion Unit and #5083 Storage Expansion Tower. The Ultra SCSI disks gives
best performance when attached to a #6532 in these Ultra SCSI Expansion Units or Towers.
These Ultra SCSI disks are 17.54G Disk Unit #6714, 8.58G Disk Unit #6713, 4.19G Disk Unit
#6907 and 1.96G Disk Unit #6906.
The #6532 also supports disks installed in the Storage Expansion Units #5051 and #5052
and in the Storage Expansion Towers #5081 and #5082. None of these are Ultra SCSI Units
and Towers. Therefore, they do not provide full Ultra SCSI performance.
The #5052 and #5082 are supported for migration to the Model 7xx. For the 7xx models, the
#5058 Storage Expansion Unit and #5083 Storage Expansion Towers, which are both Ultra
SCSI, are offered. They provide full Ultra SCSI performance when the disks are attached to a
#6532. One #5058 is supported per #5081 or #5083.
On the #9364/#5064 System Unit Expansion and #9331 Expansion Unit for SPD Cards, the
#6532 supports up to 15 disk units located in the system unit expansion and occupies one
card slot.
The #6532 controller supports a maximum of 16 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 disks units. A maximum of four RAID-5 arrays are supported on one #6532. Disk units
not supported in a RAID-5 array can also be attached to the same #6532 in either
unprotected or a mirrored environment.
The #6532 requires OS/400 Version 4. The #6532 is supported on PowerPC based models
with SPD card slots. It is not supported on Models 170, SB1, and 720 with no SPD card slots.
The #6532 offers improved performance over the #6502, #6512, and #6530, and therefore,
effectively replaces them. The #6532 occupies one I/O card slot. It does not offer support for
compression. The #6533 RAID Disk Unit Controller, which supports compression effectively,
supersedes the #6532 when systems are ordered with V4R2 or later.
Note: V4R3 is required for compression.
#6533 RAID Disk Unit Controller (4M Cache) Ultra SCSI Compress. SPD
The #6533 disk controller is functionally equivalent to the #6532 with the added capability to
support hardware data compression. For a full description, see the #6532 section above.
The #6533 offers an enhancement over the #6532 in that it supports data compression when
used with OS/400 V4R3 onward.
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I/O Adapter