NEC Storage Performance Monitor/Optimizer User Manual page 92

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Chapter 5 Installation of Performance Optimization Function
Capacity of a Work Disk for Optimization
The capacity of the Moved Material Logical Disk must be identical to that of the Work Disk for Optimization. Set
the Work Disk for Optimization in accordance with the capacity of the Moved Material Logical Disk.
RAID type of a Work Disk for Optimization
A logical disk can be moved even if the RAID type is different between the logical disk and Work Disk for
Optimization. However, be careful that if the RAID types are different, the effect of tuning cannot be predicted.
The method of arranging Work Disks for Optimization at installation of a disk array subsystem is one of operation
modes. If Work Disks for Optimization are allocated beforehand, performance can be tuned without physical disks
being added. However, since it is difficult to predict occurrence of a bottleneck in performance, arrangement of Work
Disks for Optimization needs to be designed after due consideration.
Note the following when arranging Work Disks for Optimization at installation of a disk array subsystem:
Load on physical disks (RANK) on which Work Disks for Optimization are arranged
When physical disks with Work Disks for Optimization being arranged are subjected to a high load, they cannot be
used as the move destinations of logical disks.
Utilization ratio of a disk array subsystem
Work Disks for Optimization cannot be used for business. Be careful for the utilization ratio of the disk array
subsystem not to decrease because of the setting of Work Disks for Optimization.
II-10

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