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Drive Performance
If you run applications that are highly dependent on tape-processing speed, you
can take advantage of the significant performance improvements provided by the
IBM 3580 Ultrium 2 Tape Drive. Table 2 lists the performance characteristics of
both the Ultrium 2 and Ultrium 1 models.
Table 2. Performance characteristics of the Ultrium 2 Tape Drive and the Ultrium 1 Tape Drive
Performance Characteristic
Native sustained data rate
Compressed data rate (at 2:1
compression)
Maximum sustained data rate (at
maximum compression)
Burst data rate for Low Voltage
Differential (LVD) SCSI drives
Burst data rate for High Voltage
Differential (HVD) SCSI drives
Nominal load-to-ready time
Nominal unload time
Average search time to first byte of
data
Note: All sustained data rates are dependent on the capabilities of the interconnect (for example, an UltraSCSI bus
is limited to less than 40MB/sec).
By using the built-in data-compression capability of the tape drives, you can
achieve greater data rates than the native data transfer rate. However, the actual
throughput is a function of many components, such as the host system processor,
disk data rate, block size, data compression ratio, SCSI bus capabilities, and system
or application software.
2
IBM 3580 Ultrium Tape Drive Setup and Operator Guide
Table 1. 3580 Tape Drive Models
Model
L11
L13
L23
H11
H13
H23
Ultrium 2 Tape Drive
(with Ultrium 2 media)
(with Ultrium 1 media)
(with Ultrium 2 media)
(with Ultrium 1 media)
107 MB/s (Ultra160)
160 MB/s (Ultra160)
40 MB/s (Ultra)
SCSI Attachment
LVD
LVD
LVD
HVD
HVD
HVD
Tape Drive
35 MB/s
20 MB/s
70 MB/s
40 MB/s
15 seconds
15 seconds
49 seconds
Ultrium 1 or Ultrium 2
Ultrium 1
Ultrium 1
Ultrium 2
Ultrium 1
Ultrium 1
Ultrium 2
Ultrium 1 Tape Drive
15 MB/s
30 MB/s
60 MB/s
80 MB/s (Ultra2)
40 MB/s (Ultra)
20 seconds
18 seconds
73 seconds
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