I/O Adapter 273
I/O Adapter
support Hardware Data Compression (HDC). Tape subsystems attached to the #6501
support a compaction algorithm using their own controller.
One #6501 can support two 9337s or 2105s. The maximum number of #6501s that can attach
to support the 9337s or 2105s varies by model. For details, see “IBM AS/400e server” on
page 77 and “Summary of All Earlier AS/400 Models” on page 701 for more information. One
I/O card slot is required and must be accommodated in the System Unit or System Unit
Expansion (#5072, #5073, or #5044).
The #6501 cannot support a tape unit and a 9337 or 2105 on the same controller. On new
orders, the #6534 Magnetic Media Controller should be ordered for tape attachment.
#6502 High Performance Controller (2M Cache) SPD
The #6502 is a SCSI controller and provides unprotected, mirroring, and RAID-5 protection of
internal disk units not supported by the MFIOP. The #6502 also has a 2M write cache for
better performance and improved device utilization.
The #6502 provides attachment capabilities for up to eight disk units in the #5051 or #9051
Storage Expansion Unit and up to 16 disk units in the #5052, #5058, or #8052 Storage
Expansion Unit, or #5061, #5082, or #5083 Storage Expansion Tower. These can be either
one-byte or two-byte SCSI disk units. It requires one I/O card slot in the System Unit, System
Unit Expansion Tower, or the Storage Expansion Towers.
On the #9364/#5064 System Unit Expansion, with the #9331 Expansion Unit for SPD Cards,
the #6502 can support up to 15 disk units located in the System Unit Expansion and occupies
one card slot.
One #6502 supports a maximum of two RAID-5 DASD arrays with a maximum of ten drives
per array. All drives in an array must be of the same capacity and parity can be spread across
four or eight drives. Drives not supported in a RAID-5 array can also be attached to the same
#6502 in either a mirrored or unprotected environment.
Only the 1.03G, 1.96G, 4.19G, 8.58G, and 17.54G disk units are supported under RAID-5
with #6502.
#6512 High Performance Controller (4M Cache) SPD
The #6512 disk controller provides unprotected, mirrored, or RAID-5 protection for internal
disk units and includes a 4M write cache for better performance and improved device
utilization.
The #6512 controls disk units installed in the #5051, #5052, #5058, #8052, and #9051
Storage Expansion Units and the #5061, #5082, and #5083 Storage Expansion Towers.
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