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When Instantiate with the null_blk driver, I hit err (-22), I am not sure it is a err of lnvm,

andy@andy-MS-7758:$ sudo modprobe null_blk use_lightnvm=1 gb=4
andy@andy-MS-7758:$ dmesg |grep nvm
[ 1309.903873] nvm: registered nullb0 [1/1/256/4096/1/1]
[ 1309.903887] nvm: err (-22) on device initialization
[ 1309.903965] nvm: registered nullb1 [1/1/256/4096/1/1]
[ 1309.903978] nvm: err (-22) on device initialization

When Instantiate media manager and target with the cmd, the cmd fail and the dmesg show device has no media manager registered

sudo lnvm create -d nullb0 -n mydevice -t rrpc
[ 3781.568705] nvm: device has no media manager registered.

Below are basic Linux and kernel info
lnvm version: 1.0

andy@andy-MS-7758:$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04 LTS
Release: 16.04
Codename: xenial
andy@andy-MS-7758:$ uname -a
Linux andy-MS-7758 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Hi,

I'm trying to use the null_blk with lightnvm. (Kernel Version 4.7.0-rc2-Branch-all3-00382-g8f956a8 )

1. Remove the all the modules.
   root@pat:nvme-fabrics# modprobe -r null_blk
   root@pat:nvme-fabrics# modprobe -r gennvm
   root@pat:nvme-fabrics# modprobe -r rrpc
2. Load all the modules.
   root@pat:nvme-fabrics# modprobe gennvm
   root@pat:nvme-fabrics# modprobe rrpc
   root@pat:nvme-fabrics# modprobe null_blk use_lightnvm=1
3. Make sure moduels are loaded.
   root@pat:nvme-fabrics# lsmod | grep -e gennvm -e null_blk -e rrpc
   rrpc 24576 0
   null_blk 16384 0
   gennvm 16384 0
4. Make sure devices are created.
   root@pat:nvme-fabrics# dmesg -c
   [ 125.681973] null_blk: LightNVM only supports 4k block size
   [ 125.681981] null_blk: defaults block size to 4k
   [ 125.682645] nullb->disk_name nullb0
   [ 125.682651] nullb->disk_name nullb0
   [ 125.682659] ++ null_lnvm_id
   [ 125.682663] -- null_lnvm_id
   [ 125.682670] nvm: registered nullb0 [1/1/256/64000/4/1]
   [ 125.686255] nullb->disk_name nullb1
   [ 125.686271] nullb->disk_name nullb1
   [ 125.686282] ++ null_lnvm_id
   [ 125.686287] -- null_lnvm_id
   [ 125.686297] nvm: registered nullb1 [1/1/256/64000/4/1]
   [ 125.689221] null: module loaded
   [ 125.689230] gb 250 bs 4096 nr_devices 2 use_lightnvm TRUE queue_mode MQ
5. Get the list of available devices.
   root@pat:nvme-fabrics# lnvm devices
   Number of devices: 2
   Device Block manager Version
   nullb1 none (0,0,0)
   nullb0 none (0,0,0)
6. Try to create the device with available device list.
   root@pat:nvme-fabrics# lnvm create -d nullb0 -n mydevice -t rrpc -o 0:0
   create failed. See dmesg.
   root@pat:nvme-fabrics# dmesg -c
   [ 400.371478] nvm: device has no media manager registered.

Can someone help me to resolve this issue ?

I have two 512GB OCSSD devices. Both of them are able to use lnvm command to create pblk. But I need to combine these two physical 512GB devices into one logic 1TB devices without changing File System. It seems that the command 'create' cann't not make it, because it can only create one device at a time. Is there any idea about how to make it?