XFS filesystem resizing

Shrink

XFS由硅谷图形开发，支持在线碎片整理和扩容，截至到2017年8月，暂不支持在线收缩，只能dump, mkfs and restore。

• Backup home
  $ yum install xfsdump
$ xfsdump -f /tmp/home.dump /home

• umount home
  $ umount /home

• Resize
  lvreduce -L 40G /dev/cl/home

• Recreate xfs filesystem
  $ mkfs.xfs -f /dev/cl/home

• mount home
  $ mount /dev/mapper/cl-home /home

• Restore home
  $ xfsrestore -f /tmp/home.dump /home

• 检查/etc/fstab文件和/home

Extension

$ pvcreate /dev/sda3
$ pvs -v
$ vgextend centos /dev/sda3
$ vgs -v
$ lvextend -L +100G /dev/mapper/centos-root　　
$ lvs -v
$ xfs_growfs /dev/mapper/centos-root