Capacity expansion of xfs file system in LVM
Introduction | I have never been exposed to CentOS 7 before and do not understand the features it has changed. I accidentally came into contact with LVM in centos 7. The method of creating LVM is the same as that in 6, but the expansion of LVM is a little different. However, the expansion using the previous method never took effect. It took me a long time to figure out the expansion method. Xfs is the default file system type of CentOS7, and different file system types have different creation, inspection, and adjustment commands. |
Xfs is the default file system type of CentOS7, and different file system types have different creation, inspection, and adjustment commands.
In the xfs file system, the partition can only be increased but not reduced.
[root@localhost ~]# ls /lib//modules/3.10.0-229.20.1.el7.x86_64/kernel/fs #查看内核所支持的所有文件系统类型 binfmt_misc.ko ceph dlm fat gfs2 lockd nfs_common overlayfs udf btrfs cifs exofs fscache isofs mbcache.ko nfsd pstore xfs cachefiles cramfs ext4 fuse jbd2 nfs nls squashfs
I have previously created a new partition and added it to vg, and the physical boundaries have also been expanded.
When extending the logical boundary, the error is reported as follows:
[root@localhost ~]# resize2fs -p /dev/mapper/centos-root resize2fs 1.42.9 (28-Dec-2013) resize2fs: Bad magic number in super-block 当尝试打开 /dev/mapper/centos-root 时 找不到有效的文件系统超级块.
First I thought of using fsck to repair it, but it didn’t work. After seeing the error message, I realized that the xfs file needs to be repaired using xfs_repair
[root@localhost ~]# fsck /dev/mapper/centos-root fsck,来自 util-linux 2.23.2 If you wish to check the consistency of an XFS filesystem or repair a damaged filesystem, see xfs_repair(8).
Then try to repair it, but it doesn't work. You need to uninstall it to repair it. This file system is mounted under /, so don't even think about it.
[root@localhost ~]# xfs_repair /dev/mapper/centos-root xfs_repair: /dev/mapper/centos-root contains a mounted filesystem xfs_repair: /dev/mapper/centos-root contains a mounted and writable filesystem fatal error -- couldn't initialize XFS library
Finally, after some research on the Internet, I found out that after the logical expansion of the xfs file system, there is still one more step to complete:
[root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- 95.00g swap centos -wi-ao---- 3.88g [root@localhost ~]# df -lh 文件系统 容量 已用 可用 已用% 挂载点 /dev/mapper/centos-root 46G 42G 4.5G 91% / ------------>46G devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 164K 1.9G 1% /dev/shm tmpfs 1.9G 8.7M 1.9G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 497M 208M 290M 42% /boot [root@localhost ~]# xfs_growfs /dev/mapper/centos-root #执行调整,扩展后需要执行此步骤 meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=2987776 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0 data = bsize=4096 blocks=11951104, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=5835, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 11951104 to 24903680 [root@localhost ~]# df -lh 文件系统 容量 已用 可用 已用% 挂载点 /dev/mapper/centos-root 95G 42G 54G 44% / ------------>已经完成扩展 devtmpfs 1.9G 0 1.9G 0% /dev tmpfs 1.9G 164K 1.9G 1% /dev/shm tmpfs 1.9G 8.7M 1.9G 1% /run tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup /dev/sda1 497M 208M 290M 42% /boot
xfs related common commands
xfs_admin: 调整 xfs 文件系统的各种参数 xfs_copy: 拷贝 xfs 文件系统的内容到一个或多个目标系统(并行方式) xfs_db: 调试或检测 xfs 文件系统(查看文件系统碎片等) xfs_check: 检测 xfs 文件系统的完整性 xfs_bmap: 查看一个文件的块映射 xfs_repair: 尝试修复受损的 xfs 文件系统 xfs_fsr: 碎片整理 xfs_quota: 管理 xfs 文件系统的磁盘配额 xfs_metadump: 将 xfs 文件系统的元数据 (metadata) 拷贝到一个文件中 xfs_mdrestore: 从一个文件中将元数据 (metadata) 恢复到 xfs 文件系统 xfs_growfs: 调整一个 xfs 文件系统大小(只能扩展) xfs_freeze 暂停(-f)和恢复(-u)xfs 文件系统 xfs_logprint: 打印xfs文件系统的日志 xfs_mkfile: 创建xfs文件系统 xfs_info: 查询文件系统详细信息 xfs_ncheck: generate pathnames from i-numbers for XFS xfs_rtcp: XFS实时拷贝命令 xfs_io: 调试xfs I/O路径
Notice:
After using the mke2fs command on the Xfs file system, it becomes ext2. You need to modify the corresponding file system type in the file /etc/fstab!
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