運行架構的部分，網路上很多，這邊就不贅述。
Under Linux, install nvme-cli
Cmd: yum install nvme-cli
一般情況下，拿到的設備，在Linux OS下會看到設備名稱結尾會有個n1的字串
E.g.:
[root@localhost ~]# nvme list
Node Generic SN Model Namespace Usage Format FW Rev
--------------------- --------------------- -------------------- ---------------------------------------- ---------- -------------------------- ---------------- --------
/dev/nvme0n1 /dev/ng0n1 4024SNDAN4208ILA0B0V HFS00XXXXXXXXXN 0x1 12.21 GB / 1.02 TB 512 B + 0 B 51021A20
/dev/nvme1n1 /dev/ng1n1 S6UKNC0XB00533 SAMSUNG MZXXX30XXXXX-00A07 0x1 30.72 TB / 30.72 TB 512 B + 0 B MPPA5B5Q
/dev/nvme9n1 /dev/ng9n1 XXXX WDXXXXXXXXXXXXXXXXXXXX 0x1 0.00 B / 113.18 TB 4 KiB + 8 B 4.4.2
/dev/nvme9n2 /dev/ng9n2 XXXX WSXXXXXXXXXXXXXXXXXXXX 0x5 0.00 B / 1.57 GB 512 B + 8 B 4.4.2
這個n1就是指namespace 1
這個n2就是指namespace 2
Identify Controller about the NVMe
Command: nvme id-ctrl /dev/nvmeX
E.g.: $nvme id-ctrl /dev/nvme2
List the namespaces of NVMe controller under OS.
Command: nvme list-ctrl /dev/nvmeX
E.g.: Single Controller
$nvme list-ctrl /dev/nvme3
num of ctrls present: 1
[ 0]:0
E.g.: Multi-Controller: SAMSUNG MZWLR30THBLA-00A07
$nvme list-ctrl /dev/nvme2
num of ctrls present: 66
[ 0]:0x1
[ 1]:0x2
[ 2]:0x3
...
[ 64]:0x41
[ 65]:0x42
Multi-Controller的主要控制器，則是要從id-ctrl查詢
Command: nvme id-ctrl /dev/nvmeX | grep cntlid
E.g.: $ nvme id-ctrl /dev/nvme2 | grep cntlid
cntlid : 0x41
Find NVMe nsze.
Command: nvme id-ns /dev/nvmeXn1 |grep -i nsze
Detach NVMe namespace.
Command: nvme detach-ns /dev/nvmeX -n 1 -c {cntlid}
Delete NVMe namespace.
Command: nvme delete-ns /dev/nvmeX -n 1
Create NVMe namespace.
Command: nvme create-ns /dev/nvmeX -s <nsze> -c <nsze> -f 0
Attach namespace.
Command: nvme attach-ns /dev/nvmeX -n 1 -c {cntlid}
Check the sector size.
Command: nvme list |grep nvmeXn1
Command: nvme id-ns /dev/nvmeXn1 |grep -i nsze
Check NVMe namespace can be reconized by OS. (Expect /dev/nvmeXn1 exists.)
Command: ls /dev/nvmeXn1
More operation, please refer below.
Ref: https://www.ibm.com/docs/en/linux-on-systems?topic=nvme-namespaces
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