PowerCli snip
vSAN OSA
Get-VsanDisk -VMHost $vmHost | select CanonicalName, DiskFormatVersion
CanonicalName DiskFormatVersion
------------- -----------------
eui.3643543052a048400025384100000002 20
naa.58ce38ee21b04999 20
naa.58ce38ee21b04969 20
eui.3643543052a048390025384100000002 20
naa.58ce38ee21b04961 20
naa.58ce38ee21b04965 20
vSAN ESA
Get-VsanStoragePoolDisk -VMHost $vmHost | select DiskCanonicalName, DiskFormatVersion
DiskCanonicalName DiskFormatVersion
----------------- -----------------
eui.306790baa91e8342000c296372669e28 21
eui.364da4f9f4660585000c296047c9ab73 21
eui.5975709637bf6118000c296df64ee2cc 21