How to change reserved blocks in Linux partition

user@box:~$ sudo tune2fs -l /dev/md99
[sudo] password for user:
tune2fs 1.42.9 (4-Feb-2014)
Filesystem volume name:   <nuser>
Last mounted on:          /mnt/md50
Filesystem UUID:          976a8655-2619-4587-878c-dab07f7b7652
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:              244187136
Block count:              1953473536
Reserved block count:     97673676
Free blocks:              665750586
Free inodes:              213815139
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      558
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         4096
Inode blocks per group:   256
RAID stride:              128
RAID stripe width:        1048320
Flex block group size:    16
Filesystem created:       Wed Dec 28 16:17:14 2016
Last mount time:          Fri Jun 23 12:48:18 2017
Last write time:          Fri Jun 23 12:48:18 2017
Mount count:              22
Maximum mount count:      -1
Last checked:             Wed Dec 28 16:17:14 2016
Check interval:           0 (<nuser>)
Lifetime writes:          1565 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:      2474f801-44c2-4fe1-8809-34759b56a2fb
Journal backup:           inode blocks

user@box:~$ sudo tune2fs -l /dev/md99|grep -i reserved
Reserved block count:     97673676
Reserved GDT blocks:      558
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)

Solution change to 2% reserved blocks instead of 5%

The -m2 means 2% change that to the percentage you want.

sudo tune2fs -m2 /dev/md99
tune2fs 1.42.9 (4-Feb-2014)
Setting reserved blocks percentage to 2% (39069470 blocks)


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