Magnetic Media Controllers 393
Magnetic Media Controllers
• 9348-002 ½-inch Reel Tape Unit–Tabl e Top
• 9427-21x 8mm Tape Library
The #6534 offers improved performance over #2621 and #6501 for external tape attachment,
and therefore, effectively replaces them. However, there are some devices such as the #5032
Removable Media Cluster Box, the 2440-A12 ½-inch Reel Tape Unit, and the 7208-002 2.3G
8mm Cartridge Tape Unit, that are not supported by the #6534. For these devices, the #2621
is still required.
The #6534 does not provide Hardware Data Compression (HDC).
V4R2 or later is required for #6534 to support 3995 Optical Library Dataserver.
#9754 MFIOP with RAID
The #9754 MFIOP with RAID is a SCSI controller that provides unprotected, mirrored, or
RAID-5 protection for internal disk units. It includes a 4M write cache for better performance
and improved device utilization. The #9754 also controls the internal CD-ROM drive and one
internal tape unit and contains three IOA slots for communications, LAN, and twinaxial I/O
adapters.
The #9754 will control Ultra, Fast Wide, and Fast Narrow SCSI disk units located in the
system unit and the #5055 Storage Expansion Unit (Model 730) or the #5057 (Model 740).
The Ultra SCSI disks give the best performance when attached to the #9751. These Ultra
SCSI disks are 17.54 GB Disk Unit #6714, 8.58 GB Disk Unit #6713, 4.19 GB Disk Unit
#6907, 1.96 GB Disk Unit #6906, and their base disk equivalents.
The #9754 also controls disks that are not Ultra SCSI. However, in that case, the disks do not
perform at Ultra SCSI speeds.
The #9754 MFIOP with RAID supports a maximum of 20 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 disk units. A maximum of four RAID-5 arrays are supported on one
#9754. Disk units not supported in a RAID-5 array can also be attached to the #9754 in either
an unprotected or a mirrored environment.
The #9754 supports data compression when combined with OS/400 V4R3. The #9754 itself
requires V4R2 of OS/400. The CCIN number for this feature is 6754.
#2718 PCI Magnetic Media Controller
The #2718 provides SCSI External attach capability exclusively for the 7207 Model 122 4 GB
External QIC Tape Drive.
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