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Volume Usage Statistics
Performance Monitor displays the average and maximum usage, including
sequential and random access, of each volume (LDEV) in a parity group. The
volume usage is the time in use (sequential and random access) of the
physical drives of each LDEV, averaged by the number of physical drives in the
parity group.
If the monitor data shows overall high volume usage, you should consider
installing additional hardware (e.g., HDDs, DKAs, cache). If the monitor data
shows that volume usage is not balanced, you can use Volume Migration to
migrate high-usage volumes to higher HDD classes and/or to lower-usage
parity groups. The volume usage data can also be used to analyze the access
characteristics of volumes and determine the appropriate RAID level and/or
HDD type for the volumes.
For information on using Volume Migration, contact the Hitachi Data Systems
Support Center (see Calling the Hitachi Data Systems Support Center.
For details on how to view usage statistics about volumes, see Viewing Usage
Statistics on Volumes in Parity Groups.
External Volume Group Usage Statistics
If the USP V/VM storage system is connected to an external storage system by
Universal Volume Manager, Performance Monitor can also monitor the usage
conditions on external hard disk drives.
When you use Universal Volume Manager to map the volumes in the external
storage system as volumes in the USP V/VM storage system, the mapped
volumes in the external storage system are called external volumes. These
external volumes are registered in groups by Universal Volume Manager.
Performance Monitor can monitor the usage conditions for external volume
groups.
An external volume group is just a group for managing external volumes.
Unlike a parity group, it does not contain any parity information. However,
some Performance Monitor windows treat external volume groups as parity
groups.
The information that can be monitored about an external volume group differs
from that of a usual parity group. For details on how to view usage conditions
about external volume groups, see Viewing Usage Statistics on External
Volume Groups.
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
About Performance Manager Options
2-5
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