HP XP7 Storage - Manual (Page 10)

Short-range monitoring
When you perform short-range monitoring of the storage system, you control when the statistics
are collected (in real time or during a specified period of time) and how often the statistics are
collected (from once per minute to once every 15 minutes). Short-range monitoring occurs in parallel
with and does not affect long-range monitoring activities. All performance and usage statistics are
available for short-range monitoring.
•
“Sampling interval for short-range monitoring” (page 10)
•
“Maximum storing period for short-range monitoring” (page 10)
Sampling interval for short-range monitoring
The sampling interval is the length of time between data collection events for short-range monitoring.
The number of CUs to be monitored determines the options for setting the sampling interval:
•
Up to 64 CUs. If there are 64 or fewer CUs to be monitored, the sampling interval can be set
from 1 to 15 minutes in increments of 1 minute. For example, when the sampling interval is
set to 3 minutes, Performance Monitor collects statistics once every 3 minutes.
•
More than 64 CUs. If there are more than 64 CUs to be monitored, the sampling interval is
5, 10, or 15 minutes according to the user's selection. Performance Monitor collects statistics
for up to 5 days when data is collected at 5-minute intervals and for up to 15 days when data
is collected at 15-minute intervals.
Maximum storing period for short-range monitoring
For short-range monitoring the SVP can store a maximum of 1440 data collection events. Based
on this number and the sampling interval, you can calculate the maximum storing period for the
statistics as the sampling interval multiplied by 1440. For example, if you set the sampling interval
to one minute, the maximum storing period for the statistics is 24 hours:
1 minute x 1440 = 1440 minutes = 24 hours = 1 day
If you set the sampling interval to 10 minutes, the maximum storing period for the statistics is 10
days:
15 minutes x 1440 = 21600 minutes = 360 hours = 15 days
This maximum storing period is the maximum range of display in the Monitor Performance windows.
When you specify one minute for the sampling interval as in the example above, Performance
Monitor displays the statistics for a maximum of 24 hours in the lists and graphs. When you specify
15 minutes for the sampling interval, Performance Monitor displays the statistics for a maximum
of 15 days in the lists and graphs.
Long-range monitoring
When you perform long-range monitoring of the storage system, you control when the statistics
are collected: in real time or during a specified period of time. The long-range monitoring statistics
are collected at fixed 15-minute intervals (0, 15, 30, and 45 minutes of every hour) and stored
for up to 6 months (186 days). Long-range monitoring occurs in parallel with and does not affect
short-range monitoring activities.
You can collect the following statistics in long-range monitoring:
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Usage rates of MPs
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Usage rates of DRRs
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Write-pending statistics
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Access path usage statistics
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Data drive usage statistics
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Data drive access rates
10 Performance Monitor operations