[root@fir-md1-s3 127.0.0.1-2019-12-06-00:01:18]# dumpe2fs -h /dev/mapper/md1-rbod2-mdt2
dumpe2fs 1.45.2.wc1 (27-May-2019)
Filesystem volume name:   fir-MDT0002
Last mounted on:          /
Filesystem UUID:          7cbc59d2-0567-4bef-bccc-89e81ff6372f
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr dir_index filetype needs_recovery extent 64bit mmp flex_bg dirdata large_dir sparse_super large_file huge_file uninit_bg dir_nlink quota project
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              288005760
Block count:              4681213440
Reserved block count:     234060672
Free blocks:              2919903079
Free inodes:              151229937
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         2016
Inode blocks per group:   504
Flex block group size:    16
Filesystem created:       Thu Jan 24 14:00:46 2019
Last mount time:          Fri Dec  6 07:55:45 2019
Last write time:          Fri Dec  6 07:55:45 2019
Mount count:              5
Maximum mount count:      -1
Last checked:             Sun Nov  3 18:58:02 2019
Check interval:           0 (<none>)
Lifetime writes:          108 TB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          1024
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      e4e06054-3eb2-461d-92ee-96e46d72af63
Journal backup:           inode blocks
MMP block number:         10335
MMP update interval:      5
User quota inode:         3
Group quota inode:        4
Project quota inode:      151
Journal features:         journal_incompat_revoke journal_64bit
Journal size:             4096M
Journal length:           1048576
Journal sequence:         0x012715c3
Journal start:            718702
MMP_block:
    mmp_magic: 0x4d4d50
    mmp_check_interval: 10
    mmp_sequence: 0x000906
    mmp_update_date: Fri Dec  6 11:07:58 2019
    mmp_update_time: 1575659278
    mmp_node_name: fir-md1-s3
    mmp_device_name: dm-2