NEC Storage Performance Monitor/Optimizer User Manual page 119

Chapter 6 Operation of Performance Optimization Function (GUI)
Double-clicking the target RANK will display logical disks bound for the RANK in the Detailed Display Area.
(ii) Selecting Moved Material Logical Disks/Selecting Work Disk for Optimization
Among logical disks bound for the RANK to be tuned, select a Moved Material Logical Disk. It is not always
right to move a logical disk which has the highest Busy Ratio. Points to consider when logical disk movement
are as follows:
Points to consider the moved material logical disks
After logical disks have been moved, the Busy Ratio of the destination RANK (the RANK for which Work
Disks for Optimization are bound) should become nearly equal to that of the source RANK.
When there are multiple destination candidates (Work Disks for Optimization), select one that satisfies the
above item (i) and has the lowest Busy Ratio.
Example 1) Example of correct transfer
Busy Ratio of the source RANK
Busy Ratio of the moved material logical disk: 30%
Busy Ratio of the destination RANK
Busy Ratio after the moved material logical disk:
Busy Ratio of the source RANK
Busy Ratio of the destination RANK
Example 2) Example of incorrect transfer
Busy Ratio of the source RANK
Busy Ratio of the moved material logical disk: 45%
Busy Ratio of the destination RANK
Busy Ratio after the moved material logical disk:
Busy Ratio of the source RANK
Busy Ratio of the destination RANK
When you double-click a logical disk in the detailed information display area, destination candidates are
displayed in the Work Disk for Optimization Display Area. Then, based on the above-mentioned points, select a
Moved Material Logical Disk and a destination Work Disk for Optimization. The logical disks displayed in
gray cannot be selected. Gray display indicates that movement of logical disks is being executed, or that
movement schedule has been registered.
Also, a reassignment plan prepared by the performance optimization function can be selected for moved material
logical disk and work disk for optimization. For details, refer to 6.2.5 "Replacement Plan".
: 90%
: 25%
: 60%
: 55%
: 90%
: 25%
: 45%
: 70%
II-37
Almost equally averaged
The destination RANK may have a
bottleneck