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v The earlier 3494 B16 VTS relied on the compression capability of the 3590 drives
Note: Very repetitive data may allow data compression to achieve greater stacked
Table 12 provides examples of values for the Free Storage Threshold for J- and
K-type cartridges that result in an Intervention Required alarm when the number
of scratch stacked volumes is less than required to contain the threshold free
storage GB specified.
Table 13 on page 249 provides examples of values for the Free Storage Threshold
for JA, JB, and JJ-type cartridges that result in an Intervention Required alarm
when the number of scratch stacked volumes is less than required to contain the
threshold free storage GB specified.
248
3494 Tape Library Operator Guide
to store approximately 20 GB of tape volume cache data, assuming a
compression ratio of 2:1.
volume capacity.
Table 12. Free Storage Threshold for J- and K-Type Cartridges
Free Storage Threshold (GB) for J- and K-Type Cartridges
3590 Tape
VTS Model
Drive Model
3494 B16 VTS
3590 B1A
Tape Drive
3494 B18 VTS
3590 B1A
Tape Drive
3494 B18 VTS
3590 E1A
Tape Drive
3494 B18 VTS
3590 H1A
Tape Drive
3494 B18 VTS
3590 B1A
Tape Drive
3494 B18 VTS
3590 E1A
Tape Drive
3494 B18 VTS
3590 H1A
Tape Drive
3494 B10 VTS
3590 B1A
Tape Drive
3494 B10 VTS
3590 E1A
Tape Drive
3494 B10 VTS
3590 H1A
Tape Drive
3494 B20 VTS
3590 B1A
Tape Drive
3494 B20 VTS
3590 E1A
Tape Drive
3494 B20 VTS
3590 H1A
Tape Drive
Note: For free storage threshold GB for K-type cartridges, multiply the values by two.
Scratch Stacked Volumes
Data
Compression
Feature
10
not available
200 GB
none
200 GB
none
400 GB
none
600 GB
3200 or 3400
100 GB
3200 or 3400
200 GB
3200 or 3400
300 GB
included
100 GB
included
200 GB
included
300 GB
included
100 GB
included
200 GB
included
300 GB
30
50
600 GB
1000 GB
600 GB
1000 GB
1200 GB
2000 GB
1800 GB
3000 GB
300 GB
500 GB
600 GB
1000 GB
900 GB
1500 GB
300 GB
500 GB
600 GB
1000 GB
900 GB
1500 GB
300 GB
500 GB
600 GB
1000 GB
900 GB
1500 GB
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