openstack 存储节点按照报错Device /dev/sdb not found (or ignored by filtering).

root@dell-PowerEdge-T30:~# pvcreate /dev/sdb
  Device /dev/sdb not found (or ignored by filtering).
首页查看其硬盘的情况，发现 /dev/sdb存在之后调整修改

lfdisk -l

root@dell-PowerEdge-T30:~# fdisk /dev/sdb

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.

WARNING: The size of this disk is 4.0 TB (4000787030016 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).

The device presents a logical sector size that is smaller than
the physical sector size. Aligning to a physical sector (or optimal
I/O) size boundary is recommended, or performance may be impacted.

命令(输入 m 获取帮助)： n
Partition type:
   p   primary (1 primary, 0 extended, 3 free)
   e   extended
Select (default p): p
分区号 (1-4，默认为 2)： 1
Partition 1 is already defined.  Delete it before re-adding it.

命令(输入 m 获取帮助)： t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

命令(输入 m 获取帮助)： w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
root@dell-PowerEdge-T30:~# pvcreate /dev/sdb
  Device /dev/sdb not found (or ignored by filtering).
root@dell-PowerEdge-T30:~#  dd if=/dev/urandom of=/dev/sdb bs=512 count=64
记录了64+0 的读入
记录了64+0 的写出
32768字节(33 kB)已复制，0.00555416 秒，5.9 MB/秒
root@dell-PowerEdge-T30:~# pvcreate /dev/sdb
  Can't open /dev/sdb exclusively.  Mounted filesystem?