Chapter 4. IBM System Storage DS planning and configuration 233
Collect data before and after any major changes by selecting Gather support information
from the Support view of the Subsystem Management window, as shown in Figure 4-100.
Figure 4-100 Gather support information
4.10 Advanced functions
This section introduces some of the advanced features of the Storage Manager.
4.10.1 Expanding arrays
The ability to increase the available free capacity in an array (Dynamic Capacity Expansion
(DCE)) without needing to restart the host system is a very important feature. In today’s IT
environment, the need for storage space grows constantly. Many customers exhaust their
existing space sooner or later and have to expand their storage capacity. It is essential that
this process be nondisruptive and not cause any downtime.
With Storage Manager, it is possible to add new disk drives to the storage subsystem and
start the expansion procedure while the system remains fully operational. Once the
procedure starts, it cannot be stopped. This procedure might have a performance impact,
because the expansion process competes with normal disk access. We recommend that,
where possible, that this type of activity be performed when I/O activity is at a minimum. The
new free capacity can be used to create additional logical drives. Existing logical drives in the
array do not increase in size as a result of this operation.
Important: The profile and support data files provides configuration information that can
be used in case of a failure to recover the configuration. Remember to save a copy after
making changes in the configuration, and keep it outside of the DS5000 storage
subsystem disks.
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