Developers Guide

24 Understanding RAID with Dell SC Series Storage | 3104-CD-DS
Figure 12 shows Tier 1 storage allocated as single redundancy.
A single redundant tier
In the Modify tier Redundancy wizard, choices are available to change the redundancy to dual redundancy
in each tier. The storage type is configured for all three tiers regardless of the presence of physical disks in
those tiers. However, the redundancy may be selected based on tier as needed.
With dual redundancy, the RAID levels change from RAID 10 to RAID 10-DM, and from RAID 5 to RAID 6 as
shown in Figure 13.
Dual redundancy tier
Note: A RAID rebalance occurs automatically after this change. Modification in Progress indicates the
RAID rebalance is underway.