root@velocity-MS-7740:~# tune2fs -l /dev/md1
tune2fs 1.42.13 (17-May-2015)
Filesystem volume name:   <none>
Last mounted on:          /
Filesystem UUID:          1d64c5f1-d3fc-4e0e-b2e8-7fbd9dc5cf96
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype 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:              30228480
Block count:              120906496
Reserved block count:     6045324
Free blocks:              110750852
Free inodes:              29808541
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      995
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   512
Flex block group size:    16
Filesystem created:       Fri Nov 22 15:18:26 2019
Last mount time:          Fri Nov 22 17:45:14 2019
Last write time:          Fri Nov 22 23:03:05 2019
Mount count:              3
Maximum mount count:      -1
Last checked:             Fri Nov 22 17:02:49 2019
Check interval:           0 (<none>)
Lifetime writes:          41 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:      4c9817dd-33de-4230-ae22-06e14177aef8
Journal backup:           inode blocks