Device /dev/sdb excluded by a filter.

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VirtualBox 虚拟 CentOS 7 磁盘扩容
之前已经按照以上操作挂载到了 /data02，格式是 EXT4
现在希望按照下面方式，重新挂载并扩充 root 和 home

VirtualBox 虚拟CentOS7新增虚拟盘，并扩充 root和home 目录容量

报错 Device /dev/sdb excluded by a filter.

1. pvcreate 创建逻辑卷报错

   pvcreate /dev/sdb

    Device /dev/sdb excluded by a filter.
   

2. 查看逻辑卷组

vgs

  VG                 #PV #LV #SN Attr   VSize  VFreecentos_centos7-189   1   2   0 wz--n- <7.00g    0 

3. 对比 /dev/sdb1 和 /dev/sda1 ，为什么 pvcreate 不行？
   # file -s /dev/sdb1

    /dev/sdb1: Linux rev 1.0 ext4 filesystem data, UUID=4a62122e-66cc-4f4c-a78c-3b21f91a3ced (needs journal recovery) (extents) (64bit) (large files) (huge files)
   

   file -s /dev/sda1

    /dev/sda1: SGI XFS filesystem data (blksz 4096, inosz 512, v2 dirs)
   

   file -s /dev/sda2

    /dev/sda2: LVM2 PV (Linux Logical Volume Manager), UUID: YybaVN-sZR3-yrvS-t8mj-4HCh-cB1C-43l3Dw, size: 7515144192
   

难道是因为 EXT4 和 XFS ？

4. 重新分区
   # parted /dev/sdb

    GNU Parted 3.1使用 /dev/sdbWelcome to GNU Parted! Type 'help' to view a list of commands.(parted) mklabel msdos                                                    警告: 正在使用 /dev/sdb 上的分区。忽略/Ignore/放弃/Cancel? Ignore                                           警告: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?是/Yes/否/No? yes                                                         错误: Partition(s) 1 on /dev/sdb have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result,the old partition(s) will remain in use.  You should reboot now before making further changes.忽略/Ignore/放弃/Cancel? Ignore                                           (parted) quit                                                             信息: You may need to update /etc/fstab.
   

   file -s /dev/sdb1

    /dev/sdb1: Linux rev 1.0 ext4 filesystem data, UUID=4a62122e-66cc-4f4c-a78c-3b21f91a3ced (needs journal recovery) (extents) (64bit) (large files) (huge files)
   

5. 再来pvcreate
   # pvcreate /dev/sdb

      Can't open /dev/sdb exclusively.  Mounted filesystem?Can't open /dev/sdb exclusively.  Mounted filesystem?
   

6. unmount
   # unmount /dev/sdb1
   # file -s /dev/sdb1

   /dev/sdb1: Linux rev 1.0 ext4 filesystem data, UUID=4a62122e-66cc-4f4c-a78c-3b21f91a3ced (extents) (64bit) (large files) (huge files)
   

   df -lh

   文件系统                              容量  已用  可用 已用% 挂载点
   /dev/mapper/centos_centos7--189-root  6.2G  3.0G  3.3G   48% /
   devtmpfs                              1.9G     0  1.9G    0% /dev
   tmpfs                                 1.9G     0  1.9G    0% /dev/shm
   tmpfs                                 1.9G   17M  1.9G    1% /run
   tmpfs                                 1.9G     0  1.9G    0% /sys/fs/cgroup
   /dev/sda1                            1014M  145M  870M   15% /boot
   tmpfs                                 379M     0  379M    0% /run/user/0
   

   /dev/sdb1不在文件系统中了！

   file -s /dev/sdb1

   /dev/sdb1: Linux rev 1.0 ext4 filesystem data, UUID=4a62122e-66cc-4f4c-a78c-3b21f91a3ced (extents) (64bit) (large files) (huge files)
   

7. 再来pvcreate
   # pvcreate /dev/sdb

    WARNING: dos signature detected on /dev/sdb at offset 510. Wipe it? [y/n]: yWiping dos signature on /dev/sdb.Physical volume "/dev/sdb" successfully created.
   

这次 OK了，后面就应该是一样的了！

VirtualBox 虚拟CentOS7新增虚拟盘，并扩充 root和home 目录容量

CentOS7 扩容时发现 /dev/mapper/centos-home 不存在，创建后登录终端显示 -bash-4.2

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