For NVMe devices, ESXi generates device identifiers based on the information it retrieves from the devices. Generally, the NVMe devices support identifiers in EUI64 or NGUID formats, or use both formats. NGUID is a Namespace Globally Unique Identifier that uses the EUI64 16-byte designator format.
For the devices that support only NGUID format, the host-generated device identifier changes depending on the version of ESXi. The ESXi host of version 6.7 and earlier created the t10.xxx_controller_serial_number identifier. Starting with 6.7 Update 1, the host creates two identifiers: eui.xxx (NGUID) as primary and t10.xxx_controller_serial_number as alternative primary.
|ID Formats Supported by Device||Device Identifier Generated by Host|
|EUI64 ID Format||NGUID ID Format||ESXi 6.7 and earlier||ESXi 6.7 Update 1 and later|
|no||yes||t10.xxx_controller_serial_number||eui.xxx (NGUID) as primary ID
t10.xxx_controller_serial_number as alternative primary ID
Verify Mapping Between Primary and Alternative Device Identifiers
esxcli storage core device uidmap list eui.0000xyz..... Primary UID: eui.0000xyz..... Alternative Primary UIDs: t10.0000abc.... Legacy UID: vml.0000000000766d68.... Alternative Legacy UIDs: vml.000000000080906....