Magnetic Media Controllers 387
Magnetic Media Controllers
#2621 Removable Media Device Attachment SPD
The Removable Media Device Attachment, the #2621, provides for the attachment of one or
two of the following devices, in any combination:
• 2440-A12 ½-inch Reel Tape Unit
• 9348-001 ½-inch Reel Tape Unit - Rack Mount
• 9348-002 ½-inch Reel Tape Unit - Table Top
• 7208-002 2.3G 8mm Cartridge Tape Unit
• 7208-012 5.0G 8mm Cartridge Tape Unit
• 7208-222 7.0G 8mm Cartridge Tape Unit
• 7208-232 5.0G 8mm Cartridge Tape Unit (Single Drive)
The #2621 provides a hardware data compress-decompress function for these devices.
Hardware Data Compression (HDC) can increase the effective media capacity by up to two
times. The #2621 requires one I/O card slot.
The #2621 also provides attachment to one of the following devices:
• 3995 Optical Library (direct attach models)
• 7208-234 Dual 7.0 GB 8mm Cartridge Tape Unit
• 7208-232 5.0 GB 8mm Cartridge Tape Unit (Dual Drive)
• 9427 8mm Tape Library
• #5032 Removable Media Cluster Box
When the #2621 is used to attach a 3995 Optical Library DataServer, a 7208-232 Dual Drive
or 7208-234 8mm Cartridge Tape Unit, a 9427 8mm Tape Library, or #5032 Removable Media
Cluster Box must be dedicated to it.
Certain tape devices listed above are also supported by the #6534 Magnetic Media
Controller. The #6534 should be selected on new orders. For more information on #6534, see
“#6534 Magnetic Media Controller SCSI SPD” on page 392.
Limitations on combinations
• Maximum of five high workload IOPs per bus.
• Maximum of three nonsectarian high workload IOPs per bus.
• In #5044 System Unit Expansion Rack, no DASD controllers are allowed on the same bus with a 3590
tape controller.
Note:
• These guidelines are for all system buses and include the first system bus.
• Exceeding these guidelines will cause performance degradation.
Limitations to Combinations of High Workload IOPs (SPD Type)
Subsystem High Workload IOP Bus Capacity
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