CentOS7上lvm分区调整（resize2fs: Bad magic number in super-block while trying to open ...）

问题描述：根目录空间占用率100%

首先用传统resize2fs方式调整分区：

resize2fs -p /dev/mapper/centos-home 50Gresize2fs 1.42.9 (28-Dec-2013)resize2fs: Bad magic number in super-block while trying to open /dev/mapper/centos-homeCouldn't find valid filesystem superblock.

报错原因是因为文件系统是xfs（fdisk -l查看），不再支持resize2fs

 

解决思路：

①确认分区类型为lvm

②查看到home分区有大量闲置空间，决定将home的空间分配给 /

卸载home  >>  删除home  >>  将home的空间添加到 " / "   >>   重新分配home  >>   格式化home  >> 完成

会用到的命令：

df -h　　　　　　   # 查看磁盘空间

lsblk　　　　　　　# 查看块设备详情

fdisk -l                      # 查看分区详情

lvremove\lvcreate    # 逻辑卷删除/创建

lvdisplay\vgdisplay\pvdisplay   #查看逻辑卷/卷组/物理卷

xfs_growfs               # 加载xfs_growfs

操作过程：

1、分析：查看分区详情，看到sda2为lvm逻辑卷，所以可以通过将home的空间转移到根分区

# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT fd0 2:0 1 4K 0 disk sda 8:0 0 300G 0 disk ├─sda1 8:1 0 500M 0 part /boot └─sda2 8:2 0 299.5G 0 part ├─centos-root 253:0 0 50G 0 lvm / ├─centos-swap 253:1 0 9.8G 0 lvm [SWAP] └─centos-home 253:2 0 239.6G 0 lvm /home sr0 11:0 1 1024M 0 rom

2、/home备份

# mkdir /tmp/home # cp -r /home/* /tmp/home

3、umount卸载

# umount /home umount: /home: target is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) # 如果提示busy，则使用fuser解除占用 # fuser -m -v -i -k /home

4、删除home逻辑卷（lv），将home的空间腾出来到卷组（vg）

# lvremove /dev/mapper/centos-home Do you really want to remove active logical volume home? [y/n]: y Logical volume "home" successfully removed

5、重新调整 / 的大小

# lvextend -L 250G /dev/mapper/centos-root # 调整到250G Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 250.00 GiB (64000 extents). Logical volume root successfully resized.

xfs_growfs刷新

# xfs_growfs /dev/mapper/centos-root meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks = sectsz=4096 attr=2, projid32bit=1 = crc=0 finobt=0 data = bsize=4096 blocks=13107200, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=6400, version=2 = sectsz=4096 sunit=1 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 13107200 to 65536000

6、将剩下的空间重新划分到home中

# lvcreate -l +100%free -n home centos # -n 指定lv的名字，centos是vg的名字 Logical volume "home" created.

创建完成别忘了格式化

# mkfs.xfs /dev/centos/home meta-data=/dev/centos/home isize=256 agcount=4, agsize=2601472 blks = sectsz=4096 attr=2, projid32bit=1 = crc=0 finobt=0 data = bsize=4096 blocks=10405888, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal log bsize=4096 blocks=5081, version=2 = sectsz=4096 sunit=1 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0

7、重新mount并查看

# mount /dev/mapper/centos-home /home

8、完成

9、别忘了把home备份还原

 

转载于:https://www.cnblogs.com/-abm/p/11349240.html