IBM AS/400e, Руководство пользователя

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Magnetic Media Controllers
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Magnetic Media Controllers
• 3494-D10 ½-inch Cartridge Tape Library Device Frame (one 3490E-C1A/C2A with #5040
or one or two 3490E-F1A)
• 3494-D12 ½-inch Cartridge Tape Library Device Frame (one to six 3590-B1A)
• 9337-2xx, 4xx, 5xx Disk Array Subsystems
• 2105 Enterprise and Versatile Storage Servers
The #6501 requires one I/O card slot and can support up to two tape units per one controller.
The #6501 has two ports, but can support up to four devices in total for the two ports. Tape
units which have library capability have one device for the library and one device for each
tape drive. Therefore, the 3570-B02/C02 (library plus two tape drives equals three devices)
and the 3575 with more than one tape drive have additional limitations when attaching to one
port on the #6501 along with another tape drive on the second port. The #6501 does not
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. 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/#6522 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.
In the 9406 models that support SPD card slots, 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 9406 Model 720 with 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.