Chapter 2 Overview of Disk Array Configuration Setting

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Figure 2-4 Overview of the Dynamic Pool Function
The dynamic pool function provides the following advantages:
• Reduction in the cost of storage expansion
When some additional storage space is required due to an addition of new transactions and so forth,
you can add physical disks one by one as required to bind a new logical disk or expand the logical
disk capacity at that time. This means that you can add physical disks just enough for the required
capacity only with the least additional cost.
• Better flexibility of storage configuration
If the amount of data to be handled increases and the storage capacity becomes short, you can expand
the logical disk space, keeping the existing data in the logical disks. In addition, returning logical
disks no longer needed to the pool secures the unused space of the pool which can be used for another
purpose. With these features, you can flexibly support any configuration changes of storage to be
made for modification to existing transactions or operation of existing transactions.
Logical Disk
Server
Add physical disks one by one as
required to the pool to expand the
available s
p
ace.
Put back a logical disk
no longer needed to
the
p
ool.

Pool

Disk Arra

y

Physical Disk
Create a new logical
disk.
Expand the existing
logical disk capacity,
keeping the current
data.