Logical Drive Creation - HP 273914-B21 - Smart Array 6404/256 RAID Controller Technology Brief

The ACU allows administrators to set the priority of array expansion operations. A high-priority setting
prioritizes the array expansion operation over I/O requests. A low-priority setting is the ACU default
setting and gives I/O commands precedence over array expansion. During idle time, when no I/O
commands are active, the array expansion operation runs at full speed regardless of the priority
setting.

Logical drive creation

Once the array capacity is expanded, the added capacity can be used to create a new logical drive
(Figure A2) or to extend the size of an existing logical drive (described in the "Logical drive
extension" section).
Figure A2. After array expansion, the administrator can use the free space by creating a new logical drive.
For example, if every department in a company has its own logical drive and a new department is
created, the administrator might need to create an entirely new logical drive for that department.
However, many administrators wish to extend the size of their logical drive after array expansion.
Logical drive extension lets administrators increase logical drive size if the existing drive is running out
of storage space.
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