87baa599_age_APIs_for_Array_Integration__Description
[Counter Name] DEVICE [Description] 
Devices that support VAAI (LUNs on a supported storage system) are listed by their NAA ID. You can get the NAA ID for a datastore from the datastore properties in vCenter, the Storage Details—SAN view in Virtual Storage Console, or using the vmkfstools -P /vmfs/volumes/ command. LIO LUNs start with naa.6001405. Note: Devices or datastores other than LUNs on an external storage system such as CD-ROM, internal disks (which may be physical disks or LUNs on internal RAID controllers), and NFS datastores are listed but have all zeroes for VAAI counters.
Linux SCSI Target - VStorage APIs for Array Integration
Description