218 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
To create and assign array type MDisk, right-click target storage pool and select Add 
Storage, as shown in Figure 6-36.
Figure 6-36   Adding storage to a pool 
This action starts the configuration wizard that is shown in Figure 6-37. If any of the drives are 
found with Unused role, it is suggested that you reconfigure them as Candidates to be 
included into configuration.
If Internal or Internal Custom is chosen, then the system guides you through array MDisk 
creation. If External is selected, the system guides you through the selection of external 
storage.
Figure 6-37   Assigning storage to a pool
Add Storage dialog provides the following two options to configure internal arrays: 
/SM590000Automatic, which relies on the system to choose the RAID level automatically for the 
given set of drives
/SM590000Custom, which provides more flexibility and lets you choose RAID parameters manually
Note: Although Traditional RAID is still supported and might be suggested as the default 
choice in the GUI, it is recommended to use Distributed RAID 6 whenever possible. DRAID 
technology dramatically reduces rebuild times and decreases the exposure volumes have 
to the extra load of recovering redundancy.