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External Volume Usage Statistics
An external volume is a volume existing in an external storage system that is
mapped to a volume in the USP V/VM storage system using Universal Volume
Manager. Performance Monitor can monitor and display the usage conditions
for external volumes.
The information that can be monitored for an external volume differs from that
of a typical volume. For details on how to view usage conditions about external
volumes, see Viewing Usage Statistics on External Volumes in External Volume
Groups.
Channel Processor Usage Statistics
A channel processor (CHP), which is contained in a channel adapter (CHA),
processes host commands and controls data transfer between hosts and the
cache. A channel adapter contains multiple channel processors that process
host commands and control data transfer. A channel adapter can also be called
port controller.
If monitoring data shows high overall CHP usage, you should consider
installing additional CHAs. If monitoring data shows that CHP usage is not
balanced, you should consider moving some devices that are defined on
overloaded ports to ports with lower-usage CHPs to balance front-end usage.
For details on how to view usage statistics about channel adapters and channel
processors groups, see Viewing Usage Statistics on Channel Processors.
Disk Processor Usage Statistics
A disk processor (DKP), which is contained in a disk adapter (DKA), controls
data transfer between the cache and the disk devices. A disk adapter contains
multiple disk processors (DKPs).
If monitor data shows high DKP usage overall, you should consider installing
additional HDDs and/or DKAs, and then using Volume Migration to migrate the
high-write-usage volumes (especially sequential writes) to the new parity
groups. If the monitor data shows that DKP usage is not balanced, you can
use Volume Migration to migrate volumes from high-usage parity groups to
low-usage parity groups.
For information on using Volume Migration, contact the Hitachi Data Systems
Support Center (see Calling the Hitachi Data Systems Support Center.
When considering migrating a volume from one parity group to another, take
the following steps:
1. Refer to Table 2-1 to determine the parity groups from which you want to
migrate volumes.
2-6
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
About Performance Manager Options
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