Question about pNFS documentation

[ChenXiaoSong]

Greetings,

I am very interested in Parallel NFS (pNFS) and want to setup a testing 
and debugging environment for pNFS. I found some pNFS documentation [1] 
[2] [3], but I still don't know how to setup Linux environment about 
file layout, block layout, object layout, and flexible file layout. Some 
documentation like spNFS(simple pNFS) is unmaintained and was dropped. 
Can you recommend some other detailed documentation(how to use pNFS in 
Linux)?

Thanks,
ChenXiaoSong.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/nfs/pnfs-block-server.rst

[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/nfs/pnfs-scsi-server.rst

[3] https://linux-nfs.org/wiki/index.php/PNFS_Development