Dell Compellent Series 40 - Manual (Page 128)

120 Storage Center 5.5 System Manager User Guide
Disks
Configuring Storage
When the Storage Center system was setup, the system automatically selected
redundancy levels depending upon size of disks in the folder. Refer to the Storage Center
5 System Setup Guide for more information.
Modify Tier Redundancy
Storage Center 5 adds RAID 6 as an option for tiered storage. Modifying Tier Redundancy
requires a RAID Rebalance to be completed. Do not modify tiers unless sufficient free disk
space is available within the disk folder. Tier 1 is the highest performance tier, and Tier 3 is
the most cost efficient tier.
Modifying Tier Redundancy means to change it from Single Redundant (RAID 10, RAID 5-
9, or RAID 5-5) to Dual Redundant (RAID 10 D-M, RAID 6-6, or RAID 6-9). Refer to the
Glossary on page 425 for RAID definitions.
To modify storage configuration, do one of the following:
• While adding disks, click Modify Storage in the last window of the wizard, as shown in
Figure 92 on page 118 , or
• Select a disk folder. From the shortcut menu, select Configure Storage.

To modify a tier
1 Click the Modify Tier Redundancy icon above the tier you want to modify. The Modify
Tier Redundancy window appears.
Figure 93. Modify Tier Redundancy
2 Select Single or Dual Redundant. If you change from Single Redundant to Dual
Redundant, notice that:
• RAID 5-5 Standard becomes RAID 6-6 Standard
• RAID 5-5 Fast becomes RAID 6-6 Fast (if Fast Track is licensed)
• RAID 5-9 Standard becomes RAID 6-10 Standard
• RAID 5-9 Fast becomes RAID 6-10 Fast (if Fast Track is licensed)
• RAID 10 Standard becomes RAID 10-DM Standard
• RAID 10 Fast becomes RAID 10-DM Fast (if Fast Track is licensed)