234 Implementing the IBM Storwize V7000 with IBM Spectrum Virtualize V8.2.1
To choose an action, select the external MDisk in Pools → External Storage or Pools → 
MDisks by Pools, and click Actions, as shown in Figure 6-55. Alternatively, right-click the 
external MDisk.
Figure 6-55   Actions on MDisks
Discover Storage
This option is available even if no MDisks are selected. By running it, you cause the system to 
rescan the iSCSI and FC network for these purposes:
/SM590000Find any new managed disks (MDisks) that might have been added.
/SM590000Rebalance MDisk access across all available controller device ports. 
This action executes the CLI command detectmdisk. 
Assign
This action is available only for unmanaged MDisks. Select Assign to open the dialog box 
that is explained in “Assigning MDisks to pools” on page 232. 
Modify tier
Select Modify Tier to modify the tier to which the external MDisk is assigned, as shown in 
Figure 6-56. This setting is adjustable because the system cannot always detect the tiers that 
are associated with external storage automatically, unlike with internal arrays. 
Figure 6-56   Modifying an external MDisk tier
For information about storage tiers and their importance, see Chapter 10, “Advanced features 
for storage efficiency” on page 403.