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Viewing Usage Statistics on Volumes in Parity Groups
Performance Monitor monitors volumes in parity groups and lets you view the
average and the maximum usage rate in a specified period. Performance
Monitor also displays a graph illustrating changes in volume usage within that
period.
To view usage statistics about volumes in a parity group:
1. Ensure that the Performance Management window is displayed.
2. In the tree, click the Physical tab
3. In the list above the tree, select the storing period of statistics from
longrange and shortrange for display.
For details on the types of storing period of statistics, see Understanding
Statistical Storage Ranges.
When you view usage statistics about volumes, some items displayed in
the list differ depending on the selection of the storing period: longrange
or shortrange. If you want to use Volume Migration to migrate volumes,
select longrange. This enables you to confirm the estimated usage rate of
parity groups after migration. For information on using Volume Migration,
contact the Hitachi Data Systems Support Center (see Calling the Hitachi
Data Systems Support Center.
If you want to examine the ratio of ShadowImage processing, and so on, to
all the processing in the physical drive, select shortrange.
The usage statistics for a same term might be slightly different between
selecting shortrange and longrange because the monitoring precision of
these two interval types differs. Especially, differences in read rates and
write rates between the interval types are larger than other usage statistics.
4. In the tree, double-click the Parity Group folder.
The folder opens and a list of parity groups is displayed below the folder.
5. Select the desired parity group.
The list on the right displays usage statistics about volumes in the specified
parity group. The displayed statistics are the average and the maximum
usage rates for the period specified in the From and To boxes.
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Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
Performance Monitor Operations
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