Dynamic Pool - NEC Storage Manager User Manual

Chapter 2 Overview of Disk Array Configuration Setting
2 . 1 . 2 D y n a m i c P o o l
2 . 1 . 2 D y n a m i c P o o l
2 . 1 . 2 D y n a m i c P o o l
The dynamic pool is a virtual medium, which manages the space on the pool using a virtual storage
space.
Like block management in a file system, the dynamic pool manages used space and unused space.
When making up logical disks, separate unused space from the pool according to the required capacity,
then assign the physical disk space corresponding to the logical disk space.
The dynamic pool moderates the limit on the number of constituent physical disks and enables flexible
configurations. In addition, the dynamic pool allows to use additional features such as pool capacity
expansion and logical disk capacity expansion.
Logical Disk Configuration of Dynamic Pool

Dynamic Pool

LD00 LD02
LD01 LD03
...
PD00 PD01 PD02 PD03 PD04 PDnn
Figure 2-3 Logical Configuration of Disk Arrays (Dynamic Pool)
S400/S1400/S2400/S2800 disk array supports the dynamic pool function.
The dynamic pool function puts a set of physical disks on the disk array together to make up a virtual
storage pool. That is, it picks up the amount of storage required for the transaction from space unused
in the pool and bind logical disks. If the storage capacity becomes short, you can add physical disks
one by one as required and putting them into the pool to expand the unused space of the pool. The
additional unused space of the pool can be used to bind a new logical disk or expand the existing logical
disk capacity, keeping the current data. In addition, you can put back logical disks no longer needed
to the pool to extend the unused space of the pool.
Therefore, the dynamic pool function helps to manage the capacity of the storage efficiently and make a
large reduction in the cost on additional storage space. It also helps to flexibly support any
configuration changes or expansion of the storage to be done for addition of new transactions or
modification to existing transactions.
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