HP XP P9500 Storage - Manual (Page 16)

To change the size of a volume already in use, you first create a new volume larger (if possible)
than the old one, and then move the contents of the old volume to the new one. The new volume
would be remapped on the server to take the mount point of the old one, which is retired.
A disadvantage is that this manual intervention can become costly and tedious and this provisioning
strategy is appropriate only in certain scenarios.
When to use custom-sized provisioning
Custom-sized provisioning is a best fit in the following scenario:
•
When you want to manually control and monitor your storage resources and usage scenarios.
Virtual LUN software is used to configure custom-sized provisioning.
Expanded LU provisioning
If a volume larger than the largest volume is needed in a custom-size volume, the traditional storage
system-based solution is to use the logical unit size expansion (LUSE) feature to configure an
expanded logical unit (LU). This method is merely a simple concatenation of LDEVs, which is a
capacity rather than a performance configuration.
The following illustrates a simple expanded LU environment, where LDEVs are concatenated to
form a LUSE volume.
16 Introduction to provisioning