HP XP Performance Advisor Software - Manual (Page 114)

Metric Category Metric Description
Cache Usage Util
Cache Writes Pending Util
Cache Sidefile Usage Util
Cache Usage Utilization, Cache
Writes Pending Utilization, Cache
Sidefile Usage Utilization
THP Pool Occupancy The usage rate of a XP Thin
Provisioning (THP) pool.
The THP Pool Occupancy is
displayed only for XP24000.
SNAPSHOT Pool Occupancy The usage rate of a Snapshot pool.
The Snapshot Pool Occupancy is
displayed only for XP 24000.
Utilization Metrics, cont.
Journal File Usage Util The usage rate of a Continuous
Access Journal File.
Backend Metrics LDEV Sequential Read Tracks
LDEV Non-sequential Read Tracks
LDEV Write Tracks
RAID Group Se-
quential Read Tracks
RAID Group Non-se-
quential Read Tracks
RAID Group Write Tracks
ACP Pair Sequential Read Tracks
ACP Pair Non-se-
quential Read Tracks
ACP Pair Write Tracks
Response Time Metrics Average Read Response
Maximum Read Response
Average Write Response
Maximum Write Response
Single LDEVs
NOTE:
The Maximum Read Response
and Maximum Write Response
values are valid only for the last
30 seconds of the timestamp
displayed.
Collecting data
Use PA XP to display data collected at different collection rates in the same chart as if all of the data were
collected at the same collection rate. (This occurs when collecting from multiple DKCs at different rates.)
To manage varying collection rates, PA XP uses cubic spline interpolation or approximation. The basis
for the interpolation depends on the master that is selected. The master will be the set of data points
that represent the most recent collection period, as well as the shortest collection period. (The shortest
collection period is defined as the collection period where the data is most frequently collected.) After the
system determines the master, the other data points are interpolated to match the master. For example, if
you collected a set of data at five-minute intervals on one DKC, and another set of data at one-minute
intervals on another DKC, the system will carry out its cubic spline interpolation (approximation)
based on the data collected at one-minute intervals. All data will display as if it were being collected
at one-minute intervals.
If the data has the same number of collection points, the master will be the data collected from the DKC
with the shortest collection period. The system will never return more than 1,000 points. (10 points of
data are set as the default.)
114 Charts