Get Count; Library-Wide Drive Performance; Table C-5. Cap Get Count - StorageTek L180 Installation Manual

Library Statistics

GET Count

The CAP GET count is the number of times a GET was executed from a CAP,
with bins incrementing when a CAP is opened. This provides an indication of
how a CAP is being used. For example, if 10 GETs were executed from a CAP,
the "6–10" bin (see bin list below) would increment by one. Counts in the 21+
bin would indicate that the CAP is being used for normal operations, not just
import operations.

Table C-5. CAP GET Count

Bin
Idle
1
2
3
4
5
6–10
11–15
16–20
21+

Library-Wide Drive Performance

Job rate intervals are set to five and 15 minutes to best understand peak
machine usage. These intervals were chosen because such data can generally
be applied to thermal behavior of electromechanical components.
As examples, one customer may only require peak machine performance for a
time less than five minutes. If so, some electromechanical components may not
heat sufficiently to cause short- or long-term reliability issues. On the other
hand, another customer may require peak performance for a full 15 minutes or
longer. In this case, peak performance indicates that components will reach
higher operating temperatures and, therefore, require more costly components.
Note: Drive mount times are included in these statistics; these times vary
Library-wide drive performance counters are 32-bit.
C-8
GETs executed between CAP opens
0
1
2
3
4
5
6–10
11–15
16–20
21 or more
widely, depending on the drive type. As a result, these statistics cannot
be used to determine if a library is meeting its published Exchanges Per
Hour (EPH) specification.
Eleventh Edition
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