Hi I'm trying to setup a pNFS experiment environment. And this is what I have got, VM-0 (DS) running a iscsi target VM-1 (MS) initiator, mount a XFS on the device, and export it by NFS with pnfs option VM-2 (Client) initiator, but not mount, running a blkmapd mount the shared directory of VM-1 by NFS And it semes to work well as the mountstatus LAYOUTGET: 14 14 0 3472 2744 1 1381 1384 GETDEVICEINFO: 1 1 0 196 148 0 5 5 LAYOUTCOMMIT: 8 8 0 2352 1368 0 1256 1257 The kernel version I use is 4.18.19. And would anyone please help to clarify following questions ? 1. Can I involve multiple DSs here ? 2. Is this stable enough to use in production ? How about earlier version, for example 4.14 ? Many thanks in advance Jianchao