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Considerations for sizing RAID groups for drives

Configuring an optimum RAID group size for an aggregate made up of drives requires a trade-off of factors. You must decide which factor—speed of recovery, assurance against data loss, or maximizing data storage space—is most important for the aggregate that you are configuring.

You change the size of RAID groups on a per-aggregate basis. You cannot change the size of an individual RAID group.

HDD RAID groups

You should follow these guidelines when sizing your RAID groups composed of HDDs:

SSD RAID groups in Flash Pool aggregates

The SSD RAID group size can be different from the RAID group size for the HDD RAID groups in a Flash Pool aggregate. Usually, you should ensure that you have only one SSD RAID group for a Flash Pool aggregate, to minimize the number of SSDs required for parity.

SSD RAID groups in SSD-only aggregates

You should follow these guidelines when sizing your RAID groups composed of SSDs: