Effective Data ONTAP disk type

Starting with Data ONTAP 8.1, certain Data ONTAP disk types are considered to be equivalent for the purposes of creating and adding to aggregates, and spare management. Data ONTAP assigns an effective disk type for each disk type. You can mix HDDs with the same effective disk type.

When the raid.disktype.enable option is set to off, you can mix certain types of HDDs within the same aggregate.

The following table show how the disk types map to the effective disk type:

Data ONTAP disk type	Effective disk type
FCAL	SAS
SAS	SAS
ATA	SATA
SATA	SATA
BSAS	SATA
FCAL and SAS	SAS
ATA and SATA	SATA
ATA, SATA, and BSAS	SATA

When the raid.disktype.enable option is set to on, the effective disk type is same as the Data ONTAP disk type. Aggregates can be created using only one disk type. The default value for the raid.disktype.enable option is off.