Quantum SDLT 320 Guía de usuario Pagina 33

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SDLT 220 and SDLT 320 Design & Integration Guide CHAPTER 2: General Drive Specifications
81-81148-01 March 2004 2-15
2.6.4 Maximum Data Transfer Rate
The maximum sustained (and burst) data transfer rates for SDLT drives are shown
in Table 2-8.
NOTE: Cable lengths and cable type can limit attainable transfer
rate; for details, refer to SCSI Cable Length” on page 6-6.
2.6.5 Storage Capacity
For a comparison of SDLT 220/320 storage capacities, refer to “Key Differences
Between the SDLT 220 and 320” on page 2-12.
Table 2-8. Maximum Data Transfer Rates
SDLT 220
Sustained
SDLT 220
Burst
Max*
SDLT 320
Sustained
SDLT 320
Burst
Max*
Configur
ation
Native
Com-
pressed Native
Com-
pressed
HVD
(Ultra 1
SCSI)
Narrow 11 MB/sec 20 MB/sec 20 MB/sec 16 MB/sec 20 MB/sec 20 MB/sec
Wide 11 MB/sec 22 MB/sec 40 MB/sec 16 MB/sec 32 MB/sec 40 MB/sec
LVD
(Ultra 2
SCSI)
Narrow 11 MB/sec 22 MB/sec 40 MB/sec 16 MB/sec 32 MB/sec 40 MB/sec
Wide 11 MB/sec 22 MB/sec 80 MB/sec 16 MB/sec 32 MB/sec 80 MB/sec
* Burst speeds are limited by the SCSI bus itself, not the design of SDLT 220/320 or SDLTtape.
The compression rates shown assume an industry standard 2:1 compression ratio. Actual compression ratios
achieved depend on the redundancy of data files being recorded. For non-compressible (expanding) data, this
results in a reduction in capacity and transfer rate for the data. Fully random data is the worst case for
compressibility.
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