Customizing the performance monitor dashboard
The dashboard on the Performance tab initially contains five predefined portlets and one undefined portlet. You can customize all of the
portlets to display the performance data that is most meaningful to you.
1
In the Array Management Window (AMW), select the
Performance
tab.
2
Do one of the following actions:
•
Double-click the portlet that you want to change.
•
Or, click the Maximize icon on the portlet that you want to change.
•
In Portlet 6, select the Create new real-time performance graph link. This option is only available if Portlet 6 is undefined.
The
View Real-time Graphical Performance Monitor
dialog is displayed.
3
In the
Select metric
drop-down list, select the performance data that you want to view.
You can select only one metric at a time. If you opened the dialog from an existing graph, the current metric and object are
preselected.
4
In the
Select an object(s)
list, select the objects for which you want to view performance data.
You can select up to five objects to monitor on one graph. Use Ctrl-Click and Shift-Click to select multiple objects. Each object is
plotted on a separate line on the graph.
NOTE:
If you do not see a line that you defined on the graph, it might be overlapping another
line.
5
To save the changed portlet to the dashboard, click
Save to Dashboard
, and then click
OK
.
The
Save to Dashboard
option is not available if you did not make any changes, if both a metric and an object are not selected, or if
the dialog was not invoked from a portlet on the dashboard.
The dashboard on the Performance tab updates with the new portlet.
6
To close the dialog, click
Cancel
.
Specifying performance metrics
You can collect the following performance data:
•
Total I/Os – Total I/Os performed by this object since the beginning of the polling session.
•
I/Os per second – The number of I/O requests serviced per second during the current polling interval—also called an I/O request rate.
•
MBs per second – The transfer rate during the current polling interval. The transfer rate is the amount of data in megabytes that can
be moved through the I/O data connection in a second—also called throughput.
NOTE:
A kilobyte is equal to 1024 bytes, and a megabyte is equal to 1024 x 1024 bytes. Some applications calculate kilobytes
as 1,000 bytes and megabytes as 1,000,000 bytes. The numbers reported by the monitor might be lower by this difference.
•
I/O Latency – The time it takes for an I/O request to complete, in milliseconds. For physical disks, I/O latency includes seek, rotation,
and transfer time.
•
Cache Hit Percentage – The percentage of total I/Os that are processed with data from the cache rather than requiring I/O from disk.
Includes read requests that find all the data in the cache and write requests that cause an overwrite of cache data before it has been
committed to disk.
•
SSD Cache Hit Percentage – The percentage of read I/Os that are processed with data from the SSD physical disks.
The metrics available include the current value, minimum value, maximum value, and average value. The current value is the most recent
data point collected. The minimum, maximum, and average values are determined based on the start of performance monitoring. For real-
time performance monitoring, the start is when the Array Management Window (AMW) opened. For background performance monitoring,
the start is when background performance monitoring started.
Performance metrics at the storage array level are the sum of metrics on the RAID controller modules. Metrics for the RAID controller
module and disk group are computed by aggregating the data retrieved for each virtual disk at the disk group/owning RAID controller
About your MD Series storage array
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