普通情況下，XFS出現丟數據的情況為海量小文件IO場景。在該場景下，inode占用教大。

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通過上文的方式進行格式化，inode數量較小。通過大量測試，能夠使用例如以下方法提升mkfs.ext4后文件系統性能。

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方法主要內容：在/etc/mke2fs.conf文件，ext4配置中去開啟64位功能。

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[root@node21 ~]# cat /etc/mke2fs.conf
[defaults]
?base_features = sparse_super,filetype,resize_inode,dir_index,ext_attr
?blocksize = 4096
?inode_size = 256
?inode_ratio = 16384

[fs_types]
?ext3 = {
??features = has_journal
?}
?ext4 = {
??features = has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
??auto_64-bit_support = 1????? ###新添加行，告訴系統使用64位方式進行格式化。避免mkfs.ext4直接報錯。
??inode_size = 256
?}
?ext4dev = {
??features = has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
??inode_size = 256
??options = test_fs=1
?}
?small = {
??blocksize = 1024
??inode_size = 128
??inode_ratio = 4096
?}
?floppy = {
??blocksize = 1024
??inode_size = 128
??inode_ratio = 8192
?}
?news = {
??inode_ratio = 4096
?}
?largefile = {
??inode_ratio = 1048576
??blocksize = -1
?}
?largefile4 = {
??inode_ratio = 4194304
??blocksize = -1
?}
?hurd = {
????? blocksize = 4096
????? inode_size = 128
?}
[root@node21 ~]#

[root@node21 ~]# df -h
Filesystem??????????? Size? Used Avail Use% Mounted on
/dev/sda3???????????? 259G?? 29G? 217G? 12% /
tmpfs????????????????? 16G???? 0?? 16G?? 0% /dev/shm
/dev/sda1???????????? 194M?? 34M? 151M? 19% /boot
/dev/sdf1????????????? 39T?? 21T?? 18T? 54% /mnt/source
/dev/md127??????????? 5.4T? 1.8T? 3.4T? 35% /public
/dev/sdg1????????????? 22T?? 42G?? 21T?? 1% /mnt/public_back
[root@node21 ~]# df -i
Filesystem??????????? Inodes?? IUsed?? IFree IUse% Mounted on
/dev/sda3??????????? 17195008? 383263 16811745??? 3% /
tmpfs??????????????? 4106354?????? 1 4106353??? 1% /dev/shm
/dev/sda1????????????? 51200????? 41?? 51159??? 1% /boot
/dev/sdf1??????????? 8203124224 34192419 8168931805??? 1% /mnt/source????? ###XFS文件系統，40T容量。
/dev/md127?????????? 366288896 2338559 363950337??? 1% /public
/dev/sdg1??????????? 1464844288???? 295 1464843993??? 1% /mnt/public_back? ###ext4文件系統，22T容量。