命令
e2fsck
e2fsck - check a Linux ext2/ext3/ext4 file system
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resize2fs
resize2fs - ext2/ext3/ext4 file system resizer
It can be used to enlarge or shrink an unmounted file system located on device
If the filesystem is mounted, it can be used to expand the size of the mounted filesystem, assuming the kernel and the file system supports on-line resizing.
Modern Linux 2.6 kernels will support on-line resize for file systems mounted using ext3 and ext4;
ext3 file systems will require the use of file systems with the resize_inode feature enabled.
Filesystem features: resize_inode
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tune2fs -l /dev/sda3
tune2fs - adjust tunable filesystem parameters on ext2/ext3/ext4 filesystems
-l List the contents of the filesystem superblock, including the current values of the parameters that can be set via this program.
For a detailed description of the file system features, please see the man page ext4(5).
============================================== 所有可以设置的文件系统参数 [root@cu-dbs-152 ~]# tune2fs -l /dev/sda3 tune2fs 1.41.12 (17-May-2010) Filesystem volume name: <none> Last mounted on: / Filesystem UUID: 4cad5860-c0ba-46a6-809c-7d2d7adcc743 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: user_xattr acl Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 5496832 Block count: 21968640 Reserved block count: 1098432 Free blocks: 10631227 Free inodes: 5347877 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 1018 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 16 Filesystem created: Wed Jun 26 17:09:07 2019 Last mount time: Thu Jul 11 18:25:57 2019 Last write time: Wed Jun 26 17:21:58 2019 Mount count: 13 Maximum mount count: -1 Last checked: Wed Jun 26 17:09:07 2019 Check interval: 0 (<none>) Lifetime writes: 196 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Journal inode: 8 Default directory hash: half_md4 Directory Hash Seed: 357d1294-fa68-4e15-9039-25ee1becdfaf Journal backup: inode blocks