创建pv时 pvcreate 提示Device not found (or ignored by filtering).

# pvcreate /dev/md1
  Device /dev/md1 not found (or ignored by filtering).

# fdisk /dev/md1
Welcome to fdisk (util-linux 2.27.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): 
Command (m for help): n
To create more partitions, first replace a primary with an extended partition.
Command (m for help): p
Disk /dev/md1: 931.2 GiB, 999856013312 bytes, 1952843776 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 524288 bytes / 524288 bytes
Disklabel type: dos
Disk identifier: 0x538ce953
Device     Boot Start        End    Sectors   Size Id Type
/dev/md1p1       2048 1952843775 1952841728 931.2G 83 Linux

# pvcreate /dev/md1p1
WARNING: xfs signature detected on /dev/md1p1 at offset 0. Wipe it? [y/n]: y
  Wiping xfs signature on /dev/md1p1.
  Physical volume "/dev/md1p1" successfully created
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