196 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
When external storage controllers are added to the IBM Storwize V5000 Gen2 environment,
the IBM Storwize V5000 Gen2 automatically discovers the controllers, and the logical unit
numbers (LUNs) that are presented by those controllers are listed as unmanaged MDisks.
However, if you attached new storage and the IBM Storwize V5000 Gen2 did not detect it, you
might need to use the Discover storage option before the system detects the new LUNs. If the
configuration of the external controllers is modified afterward, the IBM Storwize V5000 Gen2
might be unaware of these configuration changes. Use Detect MDisk to rescan the Fibre
Channel network and update the list of unmanaged MDisks.
Figure 4-73 shows the Discover storage option.
Figure 4-73 Discover storage action
Note: The Discover storage action is asynchronous. Although the task appears to be
finished, it might still be running in the background.
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