You can convert from RAID-DP to RAID-TEC for triple-parity protection, or from RAID-TEC to RAID-DP when a smaller aggregate no longer needs triple-parity protection. You can also customize the size of your RAID groups.
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Converting from RAID-DP to RAID-TEC
If you want the added protection of triple-parity, you can convert from RAID-DP to RAID-TEC. RAID-TEC is recommended if the size of the disks used in your aggregate is greater than 4 TiB.
Converting RAID-TEC to RAID-DP
If you reduce the size of your aggregate and no longer need triple parity, you can convert your RAID policy from RAID-TEC to RAID-DP and reduce the number of disks you need for RAID parity.
Considerations for sizing RAID groups
Configuring an optimum RAID group size requires a trade-off of factors. You must decide which factors—speed of RAID rebuild, assurance against risk of data loss due to drive failure, optimizing I/O performance, and maximizing data storage space—are most important for the aggregate that you are configuring.
Customizing the size of your RAID groups
You can customize the size of your RAID groups to ensure that your RAID group sizes are appropriate for the amount of storage you plan to include for an aggregate.