Chapter 6. Storage pools 209
16 online                       candidate tier_enterprise 558.4GB 
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Drive list shows Status of each drive. It can be Online, which means that drive can 
communicate with disk enclosure where it is installed. Drive status Offline indicates that there 
is no connection with it. Its status might be failed or physically removed.
Drive Use defines its current role. The following use roles are available:
/SM590000Unused: The system has access to the drive but was not told to take ownership of it. Most 
actions on the drive are not permitted. This is a safe state for newly added hardware.
/SM590000Candidate: The drive is owned by the system, and is not currently part of the RAID 
configuration. It is available to be used in an array MDisk.
/SM590000Spare: The drive is a hot spare. It is protecting RAID arrays. If any of the traditional array 
members fails, it becomes array Member. 
/SM590000Member: The drive is part of a (T)RAID or DRAID array. 
/SM590000Failed: The drive is not a part of the array configuration and is waiting for a service action.
The use that can be assigned depends on the current drive use. These dependencies are 
shown in Figure 6-25.
Figure 6-25   Allowed usage changes for internal drives
A number of actions can be performed on internal drives. To perform any action, select one or 
more drives and right-click the selection, as shown in Figure 6-26 on page 210. Alternatively, 
select the drives and click Actions. 
Note: To start configuring arrays in a new system, all Unused drives need to be configured 
as Candidates. Initial setup or Assign storage GUI wizards do that automatically.