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How Data ONTAP reports disk types

Data ONTAP associates a type with every disk. Data ONTAP reports some disk types differently than the industry standards; you should understand how Data ONTAP disk types map to industry standards to avoid confusion.

When Data ONTAP documentation refers to a disk type, it is the type used by Data ONTAP unless otherwise specified. RAID disk types denote the role a specific disk plays for RAID. RAID disk types are not related to Data ONTAP disk types.

For a specific configuration, the disk types supported depend on the storage system model, the shelf type, and the I/O modules installed in the system. For more information about the types of disks supported by your configuration, see the Hardware Universe at hwu.netapp.com.

The following tables show how Data ONTAP disk types map to industry standard disk types for the SAS and FC storage connection types, storage arrays, and for virtual storage (Data ONTAP-v):

Table 1. SAS-connected storage
Data ONTAP disk type Disk class Industry standard disk type Description
BSAS Capacity SATA Bridged SAS-SATA disks with added hardware to enable them to be plugged into a SAS-connected storage shelf.
FSAS Capacity NL-SAS Near Line SAS
MSATA Capacity SATA SATA disk in multi-disk carrier storage shelf
SAS Performance SAS Serial-Attached SCSI
SSD Ultra-performance SSD Solid-state drives
Table 2. FC-connected storage
Data ONTAP disk type Disk class Industry standard disk type Description
ATA Capacity SATA  
FCAL Performance FC  
Table 3. Storage arrays
Data ONTAP disk type Disk class Industry standard disk type Description
LUN N/A LUN A logical storage device backed by storage arrays and used by Data ONTAP as a disk. These LUNs are referred to as array LUNs to distinguish them from the LUNs that Data ONTAP serves to clients.
Table 4. Virtual storage (Data ONTAP-v)
Data ONTAP disk type Disk class Industry standard disk type Description
SAS N/A VMDK Virtual disks that are formatted and managed by VMware ESX.

For information about best practices for working with different types of disks, see Technical Report 3437: Storage Subsystem Resiliency Guide.