Yep!  You can use externally mounted datastores within VMware via iSCSI or NFS for connectivity  Please note that those NFS/iSCSI datastores will need to be managed through the vSphere WebClient and not through VxRail Manager.  Also, if VMs need to be created with storage from those external devices, you'll need to create them through the WebClient.  This should be treated as a "standard" vSphere cluster with NFS/iSCSI mounted datastores.  The VSAN datastore is not extended to external devices.
a Hi all I have user case where we have Management Pod which host  Viper SRM ESRS, Log insite, VCentre etc. As this going to be quite small environment  but is operatailal important The ask is to connect external Array such as VNX, to a VxRail  my understanding is that this can be done via iSCSI  The account is SMS account and the intent is to connect external storage to Vxrail appliance via TOR switch's. I understand there could be performance issue and FTT would have to be factored in  I have few question  1. Can I connect to Vmax?VnX using iSCSi 2. Any have architecture that I could use or any guidance that could be provide
External Connection on VxRail