Hitachi MK-96RD617-08 - Manual (Page 50)

4-8 Using the Performance Manager GUI
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User’s Guide
If you select an item to be displayed from the list before clicking Draw, the
graph shows the selected item. After drawing, if you select another item
from the list, the graph will be updated without re-clicking Draw.
Depending upon the values of the selected item, arrange the graph by
changing the highest value of the Y-axis.
Long-Range Storage
When longrange is selected, the Performance Management window
displays the statistics collected and stored in long range. The usage statistics
about resources for 3 months (i.e., 93 days) collected every 15 minutes can
be displayed in the window.
When longrange is selected, the Volume Migration button is activated. The
system administrator can start Volume Migration to migrate volumes for
balancing workloads based on the monitoring results displayed in the
Performance Management window. For information on using Volume
Migration, contact the Hitachi Data Systems Support Center (see Calling the
Hitachi Data Systems Support Center.
When longrange is selected:
• The value displayed at Gathering Interval is ineffective. The gathering
interval is fixed to 15 minutes regardless of the displayed value.
• You cannot view the statistics of external volume groups and external
volumes, and hyphens (-) appear in the list instead of these values. In this
case, you cannot draw the graph. To view this data, select shortrange.
For details on viewing the usage statistics of external volume groups and
external volumes, see Viewing Usage Statistics on External Volume Groups
and Viewing Usage Statistics on External Volumes in External Volume
Groups.
• You cannot view the ratio of ShadowImage processing, and so on, to all
processing, and the usage statistics about cache memory. For details on
"the ratio of ShadowImage processing, and so on, to all processing", see
the description about the ShadowImage column in Viewing Usage
Statistics on Volumes in Parity Groups.
Short-Range Storage
When shortrange is selected, the Performance Management window
displays the statistics collected and stored in short range. The usage statistics
about resources are collected with the interval indicated by Gathering
Interval. The storing period of statistics, which is equivalent to the range of
monitoring data that can be displayed, changes between 8 hours and 15 days
depending on the gathering interval.
When shortrange is selected, the Volume Migration button is deactivated.
In addition, estimated usage rates of volumes after migration by Volume
Migration cannot be displayed.