HP Capacity Advisor 7.2 User Guide

Disk Tab
Table 18 Attributes available for use in analysis queries: Disk Tab
DescriptionAttribute NameSection
Percentage of the available bandwidth being
utilized, measured in megabytes per second
(MB/s).
For more information see “Units and
terminology” (page 211).
Peak Disk I/O (%)Disk I/O Utilization (%)
15–Min Disk I/O (%)
90%ile Disk I/O (%)
Avg Disk I/O (%)
Total data being transferred, measured in
MB/s.
For more information see “Units and
terminology” (page 211).
Peak Disk I/O (MB/s)Disk I/O Utilization (MB/s)
15–Min Disk I/O (MB/s)
90%ile Disk I/O (MB/s)
Avg Disk I/O (MB/s)
The number of data disk transfers per second,
measured in Input/Output Operations per
Second (IOPS). Each disk block that is read or
written counts as an I/O operation.
This metric is only collected from physical Linux
and Windows systems.
Peak Disk I/O (IOPS)Disk I/O Utilization (IOPS)
15–Min Disk I/O (IOPS)
90%ile Disk I/O (IOPS)
Avg Disk I/O (IOPS)
The system's disk I/O capacity as defined by
the user. If a value is not explicitly entered for
the system, the all-time highest observed
reading is used to estimate capacity.
Disk I/O Cap (MB/s)Disk Capacity
The Disk High-Water Mark – the system's
all-time peak observed disk throughput in
MB/s, observed over the life of the system.
Disk HWM (MB/s)
The headroom percentage indicates how much
the demand for the disk I/O could grow before
violating the system's disk I/O utilization limits.
This metric is capped at 3100% to avoid
dividing by zero or other small numbers.
Disk I/O Headroom
The percentage of valid disk samples in the
selected interval. Data points can be invalid
if:
• The system is down and data cannot be
collected from it.
• The CMS is down and cannot collect any
data.
• Data was collected, but a user marked the
data as invalid.
% Disk Valid
NOTE: Peak, 15-minute sustained, 90th percentile, and average values are available as separate
attributes. See Table 13 (page 115).
Creating custom analysis queries 121