Installation Of Work Disks For Optimization - NEC Storage Performance Monitor/Optimizer User Manual

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The NEC Storage PerformanceOptimizer moves logical disks on a high-load physical disk to a low-load physical disk
to distribute the concentration of I/O thereby canceling the bottleneck.
When a logical disk is moved, another logical disk which is hidden from all business systems and no access is ensured
is required. This logical disk is called a Work Disk for Optimization.
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You can set Work Disks for Optimization by using the LD Administrator function of the iSM (NEC Storage
ReallocationControl). For the setting method, refer to the "NEC Storage Manager Configuration Setting Tool User's
Manual (GUI)" (IS007).
Due to NEC Storage PerformanceOptimizer's limitation of logical disk movement and the nature of the Work Disk
for Optimization, logical disks listed below cannot be specified as Work Disks for Optimization. Please note this
point when you specify configuration of the disk array.
A multiple RANK type logical disk
A logical disk set in pairs of DDR/RDR (Note 1)
In addition, the maximum number of Work Disks for Optimization which can be set for each disk array is
predetermined. The maximum number of Work Disks for Optimization depends on the specification of each disk
array. Therefore, check the number when you configure the settings for the disk array. On the other hand, for
moving cache-resident logical disk, a logical disk of one-logical disk/1-RANK configuration (RAID1 only) must be
selected as a work disk for optimization.
(Note 1) For details of DDR/RDR, refer to the "NEC Storage Data Replication User's Manual (Function Guide)"
and "NEC Storage Data Replication User's Manual (Installation and Operation Guide for Windows)".
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Generally, a bottleneck in performance occurs due to an increase of the amount of data, which results from an increase
of the amount of work, or an access pattern change. Work Disks for Optimization are to be used when NEC Storage
PerformanceOptimizer eliminates the cause of a bottleneck in performance. There is no need to arrange them when
installing a disk array subsystem.
If the amount of work increases, usually distribute the load by adding physical disks. When tuning performance with
NEC Storage PerformanceOptimizer, arrange Work Disks for Optimization on the added physical disks (RANK) and
move logical disks from high-load physical disks.
Note the following when arranging Work Disks for Optimization:
Chapter 5 Installation of Performance Optimization Function
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