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For example, if the Ave. (Total) box for the volume 0:01 displays "20 ->
18", the average usage rate of the parity group that the volume belongs to
is 20 percent. If the volume were migrated out of the parity group, the
average usage rate of that group is expected to drop to 18 percent.
•
ShadowImage: This item is displayed only when you select shortrange
for the storing period of statistics. ShadowImage indicates the
percentage of the processing of the following programs to all the
processing of the physical drives, for each volume. This value is found by
dividing access time to physical drives by the following programs by all the
access time to physical drives.
– ShadowImage for IBM z/OS
– ShadowImage
– Compatible FlashCopy
– Compatible FlashCopy V2
– Volume Migration (For information on using Volume Migration, contact
the Hitachi Data Systems Support Center (see Calling the Hitachi Data
Systems Support Center.)
– Copy-on-Write Snapshot
The Ave. (Total) column displays the average percentage of processing of
the above programs in the specified period.
The Max. column displays the maximum percentage of processing of the
above programs in the specified period.
For details on the above programs, see the respective user's guides.
•
CLPR: This column indicates numbers and names of CLPRs corresponding
to each parity group which the volume belongs to, in the format
"CLPR-number
Manager User's Guide.
Hitachi Universal Storage Platform V/VM Hitachi Performance Manager User's Guide
CLPR-name". For details on CLPRs, see the Virtual Partition
:
Performance Monitor Operations
5-13
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