今天易秋網絡老易給客戶一個機器磁盤做LVM擴容的時候，發現有這個錯誤提示。2塊1TB的磁盤，LVM分區擴容后成2TB。當我敲pvcreate /dev/sdb1是時候，提示：Can’t initialize physical volume “/dev/sdb1” of volume group physical volume not initialized.為什么會出現這個情況呢，大概就是以前做過lvm分區，以前的記錄沒有刪除。如何解決這個問題呢。其實很簡單，加個參數類似強制執行的意思，pvcreate -ff -y /dev/sdb1就可以了。下面把操作過程簡單說明下。

操作前的一些情況：

[root@E3-1230-265 ~]# df -h
Filesystem                 Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-rootlv  927G  1.4G  926G   1% /
devtmpfs                   7.8G     0  7.8G   0% /dev
tmpfs                      7.8G     0  7.8G   0% /dev/shm
tmpfs                      7.8G  8.7M  7.8G   1% /run
tmpfs                      7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/sda1                  494M  138M  357M  28% /boot
tmpfs                      1.6G     0  1.6G   0% /run/user/0

[root@E3-1230-265 ~]# lsblk
NAME              MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                 8:0    0 931.5G  0 disk
├─sda1              8:1    0   500M  0 part /boot
└─sda2              8:2    0   931G  0 part
  ├─rootvg-rootlv 253:0    0   927G  0 lvm  /
  └─rootvg-swaplv 253:1    0     4G  0 lvm  [SWAP]
sdb                 8:16   0 931.5G  0 disk
└─sdb1              8:17   0 931.5G  0 part

[root@E3-1230-265 ~]#  pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               rootvg
  PV Size               931.02 GiB / not usable 4.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238341
  Free PE               0
  Allocated PE          238341
  PV UUID               52lO1Y-coo9-QTVK-Ib4U-y2Fm-7w55-zJ0BlH

  WARNING: Device for PV 1D66dK-SyWK-Vm1I-Rgdx-TyA4-tHXB-0LFEGu not found or rejected by a filter.
  --- Physical volume ---
  PV Name               [unknown]
  VG Name               centos
  PV Size               930.51 GiB / not usable 4.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              238210
  Free PE               1
  Allocated PE          238209
  PV UUID               1D66dK-SyWK-Vm1I-Rgdx-TyA4-tHXB-0LFEGu

  --- Physical volume ---
  PV Name               /dev/sdb1
  VG Name               centos
  PV Size               931.51 GiB / not usable 4.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              238466
  Free PE               0
  Allocated PE          238466
  PV UUID               RvJSf5-zrH3-hysf-pQ76-ZQ6U-4lqH-nn8ChC

[root@E3-1230-265 ~]# vgdisplay
  --- Volume group ---
  VG Name               rootvg
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <931.02 GiB
  PE Size               4.00 MiB
  Total PE              238341
  Alloc PE / Size       238341 / <931.02 GiB
  Free  PE / Size       0 / 0
  VG UUID               i16vp8-vgWX-xsEm-Zf2V-yYrq-QmFu-dAEgjE

  WARNING: Device for PV 1D66dK-SyWK-Vm1I-Rgdx-TyA4-tHXB-0LFEGu not found or rejected by a filter.
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               0
  Max PV                0
  Cur PV                2
  Act PV                1
  VG Size               <1.82 TiB
  PE Size               4.00 MiB
  Total PE              476676
  Alloc PE / Size       476675 / <1.82 TiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               mVTKvF-LaJB-hkEl-0h21-lYSB-O3wf-OBRE5G

操作后的一些情況：

[root@E3-1230-265 ~]# pvcreate -ff -y /dev/sdb1
  WARNING: Device for PV 1D66dK-SyWK-Vm1I-Rgdx-TyA4-tHXB-0LFEGu not found or rejected by a filter.
  Physical volume "/dev/sdb1" successfully created.

[root@E3-1230-265 ~]#  vgextend rootvg /dev/sdb1
  Volume group "rootvg" successfully extended

[root@E3-1230-265 ~]# vgdisplay
  --- Volume group ---
  VG Name               rootvg
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               <1.82 TiB
  PE Size               4.00 MiB
  Total PE              476807
  Alloc PE / Size       238341 / <931.02 GiB
  Free  PE / Size       238466 / <931.51 GiB
  VG UUID               i16vp8-vgWX-xsEm-Zf2V-yYrq-QmFu-dAEgjE

[root@E3-1230-265 ~]# lvextend -l +238466 /dev/rootvg/rootlv
  Size of logical volume rootvg/rootlv changed from <927.02 GiB (237317 extents) to 1.81 TiB (475783 extents).
  Logical volume rootvg/rootlv successfully resized.

root@E3-1230-265 ~]#  xfs_growfs /dev/rootvg/rootlv
meta-data=/dev/mapper/rootvg-rootlv isize=512    agcount=4, agsize=60753152 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=243012608, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=118658, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 243012608 to 487201792

[root@E3-1230-265 ~]# df -h
Filesystem                 Size  Used Avail Use% Mounted on
/dev/mapper/rootvg-rootlv  1.9T  1.4G  1.9T   1% /
devtmpfs                   7.8G     0  7.8G   0% /dev
tmpfs                      7.8G     0  7.8G   0% /dev/shm
tmpfs                      7.8G  8.7M  7.8G   1% /run
tmpfs                      7.8G     0  7.8G   0% /sys/fs/cgroup
/dev/sda1                  494M  138M  357M  28% /boot
tmpfs                      1.6G     0  1.6G   0% /run/user/0

[root@E3-1230-265 ~]# lsblk
NAME              MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda                 8:0    0 931.5G  0 disk
├─sda1              8:1    0   500M  0 part /boot
└─sda2              8:2    0   931G  0 part
  ├─rootvg-rootlv 253:0    0   1.8T  0 lvm  /
  └─rootvg-swaplv 253:1    0     4G  0 lvm  [SWAP]
sdb                 8:16   0 931.5G  0 disk
└─sdb1              8:17   0 931.5G  0 part
  └─rootvg-rootlv 253:0    0   1.8T  0 lvm  /