Ibm 7207 Model 122 4 Gb External Qic Tape Drive - IBM i series Handbook

Removable Storage Media Devices
Machine 7207-122
Model
1. The degree of compression that is achieved is highly sensitive to the characteristics of the data being
compressed.
2. The actual throughput that is achieved is a function of many components, such as system processor, disk
data rate, data block size, data compressibility, I/O attachments, and the system or application software used.
3. Write rate of DVD.
4. Read rate of DVD.
5. V4R5 or later is required to support the #2749.
6. Indicates whether the tape subsystem supports a compaction algorithm. The algorithms are Improved Data
Recording Capability (IDRC), Lempel Ziv 1 (LZ1), or Adaptive Lossless Data Compression (ALDC). These
algorithms enable more data to be written to tape up to the maximum shown.

IBM 7207 Model 122 4 GB External QIC Tape Drive

The 7207 Model 122 is a stand-alone QIC ¼-inch streaming linear tape drive
with the capacity of 4 GB per cartridge that incorporates Single Channel
Linear Recording (SLR5) QIC technology. The 7207 Model 122 uses the
QIC-4DC format.
Positioning
Some features of the low cost single tape cartridge solution for removable media are:
• Backward compatibility with previous QIC tape formats. Ideal for data interchange.
• Tape can be used as IPL source for LPAR partitioning configurations.
The Model 122 provides media capacity up to 4 GB (8 GB with a 2:1 compression ratio) data
storage per cartridge. It has a sustained data transfer rate of 380 KB per second (760 KB per
second with a 2:1 compression ratio). It is read and write backward compatible with QIC-120,
QIC-525, QIC-1000 and QIC-2GB, QIC-2DC and QIC-4GB tape data formats. It is fully
compatible with cartridges used by the iSeries 4 GB Internal Tape Unit. See "4 GB ¼-Inch
Internal Cartridge Tape Unit Technology" on page 342 for more information.
It attaches to the iSeries using:
• #2768 PCI Magnetic Media Controller
• #2718 PCI Magnetic Media Controller
For a description of the #2768 and #2718, see "I/O Adapters and Controllers" on page 291.
There is also a tape Auto Loader Library that supports QIC media. See "IBM 7329 Model 308
SLR100 Tape Autoloader" on page 363 for more information.
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iSeries Handbook
7208-342 7208-345 3570-C00 3580-H11 7210-025