xfs文件系统缩容

转载 http://m.weizhi.cc/tech/detail-314001.html

[root@LinuxVm ~]# df -Th

Filesystem          Type      Size  Used Avail Use% Mounted on

/dev/mapper/cs-root xfs        70G  3.8G   67G   6% /

/dev/mapper/cs-home xfs       160G  1.2G  158G   1% /home

/dev/sdb2           xfs      1014M  215M  800M  22% /boot

/dev/sdb1           vfat      599M  7.3M  592M   2% /boot/efi

[root@LinuxVm ~]# yum -y install xfsdump

[root@LinuxVm ~]# xfsdump -f /home.xfsdump /home # 期间会有两次确认信息

[root@LinuxVm ~]# ll -h /home.xfsdump

-rw-r--r--. 1 root root 29K Apr 13 21:55 /home.xfsdump

[root@LinuxVm ~]# fuser -km /home

/home:                5728c  5760c

[root@LinuxVm ~]# umount /home

[root@LinuxVm ~]# lvreduce -L 10G /dev/cs/home

  WARNING: Reducing active logical volume to 10.00 GiB.

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce cs/home? [y/n]: y

  Size of logical volume cs/home changed from 159.10 GiB (40730 extents) to 10.00 GiB (2560 extents).

  Logical volume cs/home successfully resized.

[root@LinuxVm ~]# lvextend -l +100%FREE /dev/cs/root

  Size of logical volume cs/root changed from 70.00 GiB (17920 extents) to 219.10 GiB (56090 extents).

  Logical volume cs/root successfully resized.

[root@LinuxVm ~]# xfs_growfs /dev/cs/root

[root@LinuxVm ~]# df -Th

Filesystem          Type      Size  Used Avail Use% Mounted on

/dev/mapper/cs-root xfs       220G  4.8G  215G   3% /   #剩余空间已经全部给到了根分区

/dev/sdb2           xfs      1014M  215M  800M  22% /boot

/dev/sdb1           vfat      599M  7.3M  592M   2% /boot/efi

[root@LinuxVm ~]# mkfs.xfs /dev/cs/home -f

[root@LinuxVm ~]# mount /dev/cs/home /home

[root@LinuxVm ~]# xfsrestore -f /home.xfsdump /home

[root@LinuxVm ~]# grep home /etc/fstab

/dev/mapper/cs-home     /home                   xfs     defaults        0 0

[root@LinuxVm ~]# blkid | grep home  #确认一下，万一是UUID挂载，需要更新一下fastab

/dev/mapper/cs-home: UUID="62ffb186-26e2-4fe9-abb1-8dff33975da7" BLOCK_SIZE="512" TYPE="xfs"

[root@LinuxVm ~]# df -Th | egrep 'home|root'

/dev/mapper/cs-root xfs       220G  4.8G  215G   3% /

/dev/mapper/cs-home xfs        10G  104M  9.9G   2% /home