108 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
Figure 3-52 System migration
At any time, you can pause the running migration processes or create a new one. No license
for External Virtualization is required to migrate from old storage to your new IBM Storwize
V5000.
3.5 Volumes menu
A volume is a logical disk that the system presents to the attached host. Application servers
access volumes, not MDisks or drives. Volumes have additional characteristics. They can be
automatically expanded, mirrored, or pre-allocated. The following list provides a description of
the volume characteristics and differences:
Basic A basic (f
ully allocated) volume is the traditional data store method
when any host input/output (I/O) is destaged to the drives. Even zeros
are destaged. All of the zeros that exist are written.
Mirrored By using volume mirroring, a volume can have two physical copies.
Each volume copy can belong to a different pool, and each copy has
the same virtual capacity as the volume. In the management GUI, an
asterisk (*) indicates the primary copy of the mirrored volume. The
primary copy indicates the preferred volume for read requests.
Note: Before migrating storage, ensure that all host operations are stopped, all the
appropriate changes are made to the environment based on the connection type, and the
storage that is being migrated is configured to use the device.
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