module level. The values reported for a RAID controller module, or a storage array might be greater than the sum of the values reported for
all the virtual disks. The values reported for a RAID controller module or storage array include both host I/Os and I/Os internal to the
storage array (metadata reads and writes), whereas the values reported for a virtual disk include only host I/Os.
On a performance monitor graph, you can specify one metric and up to five objects. Not all metrics apply to all objects.
Table 5. Performance metrics
Metric
Storage Array
RAID
Controller
Modules
Virtual Disks
Snapshot
Virtual Disks
Thin Virtual
Disks
Disk Groups or
Disk Pools
Physical Disks
Total I/Os
X
X
X
X
X
X
–
IOs/sec
X
X
X
X
X
X
–
MBs/sec
X
X
X
X
X
X
–
I/O Latency
–
–
X
X
X
–
X
Cache hit %
X
X
X
X
X
X
–
Viewing real-time textual performance monitor
1
In the Array Management Window (AMW), do one of the following:
•
Click the
Performance
tab, and then click the
Launch real-time textual performance monitor
link.
•
Select
Monitor
>
Health
>
Monitor Performance
>
Real-time performance monitor
>
View textual
.
The
View Real-time Textual Performance Monitor
dialog is displayed.
2
To select the objects to monitor and the sampling interval, click the
Settings
button.
The
Settings
button is available only when the real-time textual performance monitor is not started.
The
Performance Summary Settings
dialog is displayed.
3
In the
Select an object(s)
list, select the objects for which you want to view performance data.
You can select as many objects as you want. Use
Ctrl-Click
and
Shift-Click
to select multiple objects. To select all objects, select the
Select All
check box.
4
In
Sampling Interval
list, select the sampling interval that you want.
The sampling interval can be from 5 seconds to 3600 seconds. Select a short sampling interval, such as 5 seconds, for a near-real-
time picture of performance; however, be aware that this short sampling interval can affect performance. Select a longer interval, such
as 30 seconds to 60 seconds, if you are saving the results to a file to look at later to minimize the system overhead and performance
impact.
5
Click
OK
.
6
To start collecting performance data, click
Start
.
Data collection begins.
NOTE:
For an accurate elapsed time, do not use the Synchronize RAID controller module Clocks option while using
Performance Monitor. If you do, it is possible for the elapsed time to be negative.
7
To stop collecting performance data, click
Stop
, and then click
Close
.
32
About your MD Series storage array
