Hitachi Storage Navigator Modular 2 User Guide

Managing RAID Groups8–3
Hitachi Storage Navigator Modular 2 User’s Guide
Figure 8-1:  Example of RAID Groups Tab
Table 8-1 summarizes the RAID Group activities described in this chapter.
Creating a RAID group
RAID groups can contain single or multiple parity groups. A RAID group can 
be considered as the actual RAID container for data protection, and the 
parity group as a partition of that container. This way, multiple LUNs can be 
created from each RAID group, and ported out to the same or different...

8–4Managing RAID Groups
Hitachi Storage Navigator Modular 2 User’s Guide
This procedure is intended for maintenance technicians or qualified users. 
Contact Hitachi Data Systems customer support if you have any questions 
regarding this feature.
To create a RAID group
1. In the RAID Groups tab of the Logical Units window, click Create RG. 
The Create RAID Groups window appears (see Figure 8-2).
Figure 8-2:  Example of Create RAID Groups Window
2. Complete the fields in the window (see Table 8-2).
3. Set...

Managing RAID Groups8–5
Hitachi Storage Navigator Modular 2 User’s Guide
Expanding RAID groups
You can expand the capacity of the RAID group for AMS storage systems 
without interrupting host I/O by adding a drive to the specified RAID group. 
Data is reallocated as a background process and can require some time to 
complete. 
RAID groups can be expanded with the following restrictions: 
• Only one RAID group can be expanded per command from Navigator 2, 
but you can execute the command multiple times,...

8–6Managing RAID Groups
Hitachi Storage Navigator Modular 2 User’s Guide
•  LUs or reserve LU during Modular Volume Migration.
•  LUs in which Cache Residency Manager is set.
For any of the above conditions, change the LU status and then expand 
the RAID group.
• After setting or changing Cache Partition Manager configuration. The 
storage system must be rebooted. Expand the RAID group after 
rebooting the storage system.
• In which the Power Saving function is set. Change the status of the 
Power Saving...

Managing RAID Groups8–7
Hitachi Storage Navigator Modular 2 User’s Guide
Expanding RAID groups
The following procedure describes how to expand RAID group. Expanding a 
RAID group can affect host I/O performance during the expansion.
To expand a RAID group
1. In the left column of the RAID Groups tab of the Logical Units window, 
click the checkbox of the RAID group you want to expand.
2. Click Expand RG. The Expand RAID Group window appears (see 
Figure 8-3).
Figure 8-3:  Example of the Expand RAID Group...

8–8Managing RAID Groups
Hitachi Storage Navigator Modular 2 User’s Guide
8. When a message states that the operation was successful, click Close 
to close the window and return to the RAID Groups tab. 

Managing RAID Groups8–9
Hitachi Storage Navigator Modular 2 User’s Guide
Removing RAID group expansion
To remove RAID group expansion
1. In the left column of the RAID Groups tab of the Logical Units window, 
click the checkbox of the RAID group from which you want to remove 
expansion.
2. Click Remove Expansion. The Expand RAID Group window appears 
(see Figure 8-3).
Figure 8-4:  Example of the Expand RAID Group Window 

8–10Managing RAID Groups
Hitachi Storage Navigator Modular 2 User’s Guide
Displaying detailed RAID group properties
To display the detailed properties of a RAID group assigned to a storage 
system.
To display detailed properties
1. In the RAID Groups tab of the Logical Units window, click a RAID group 
under the RAID Group column. The Properties window for the selected 
RAID group appears (see Figure 8-5).
Figure 8-5:  Example of Detailed RAID Group Properties
2. Review the fields in the Summary section...

Managing RAID Groups8–11
Hitachi Storage Navigator Modular 2 User’s Guide
In addition to the Summary section described above, the Detailed RAID 
Group Properties contains two tabs:
• Logical Units
• Assigned Drives
The following sections describe each tab.
Understanding the Logical Units tab
The Logical Units tab displays a table with a list of logical units in the 
selected RAID group, with statistics about each LUN. Controls at the top of 
the table let you display the first, next, previous, last, and...

8–12Managing RAID Groups
Hitachi Storage Navigator Modular 2 User’s Guide
Figure 8-6:  Example of Assigned Drives Tab
Figure 8-7:  Example of HDU Window