Developers Guide

9 Understanding RAID with Dell SC Series Storage | 3104-CD-DS

followed for RAID level redundancy are based on capacity and on whether the disks are added to an existing

or new storage type. Currently, disks up to 1.9 TB will default to dual redundancy for HDDs and up to 3.9 TB

for SSDs. Beyond those capacities, dual redundancy may be required. The requirements and

recommendations (defaults) for dual redundancy are shown in Table 3.

Dual redundancy requirements based on capacity

Disk type

Recommended

New storage

type (required)

Existing storage

type (required)

HDD

967 GB to 1.9 TB

2.0 TB or larger

2.79 TB or larger

SSD

1.8 TB to 3.9 TB

4.0 TB or larger

For new SC Series arrays, HDDs 2 TB and above are required to use dual redundant RAID level (RAID 10-

DM or RAID 6). For existing arrays with 2.79 TB or larger HDDs or 4.0 TB SSDs, dual redundancy is also

required.

Note: For SSDs, these rules may change over time as technology advances. These rules apply to SCOS

7.0.1–7.1.1. Refer to the release notes for the appropriate SCOS version.