Red Hat/CentOS ext4 cannot format large partitions supplement ext4 formatting method, centosext4

Red Hat/CentOS ext4 cannot format large partitions supplement ext4 formatting method, centosext4

In general, XFS may cause data loss in the case of massive small file I/O scenarios. In this scenario, inode occupies a large amount of teaching resources.

 

The above method is used for formatting, and the number of inode is small. Through a large number of tests, you can use the following method to improve the file system performance after mkfs. ext4.

 

Method: In the/etc/mke2fs. conf file and ext4 configuration, enable the 64-bit function.

 

[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 ### Add a new row, telling the system to format in 64-Bit mode. Avoid error directly reported by mkfs. ext4.
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 194 M 34 M 151 M 19%/boot
/Dev/sdf1 39 T 21 T 18 T 54%/mnt/source
/Dev/md127 5.4 T 1.8 T 3.4 T 35%/public
/Dev/sdg1 22 T 42G 21 T 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 file system, 40 TB capacity.
/Dev/md127 366288896 2338559 363950337 1%/public
/Dev/sdg1 1464844288 295 1464843993 1%/mnt/public_back ### ext4 file system, with a capacity of 22 TB.

In linux, the format of a mobile hard disk formatted with mkfsext4 is invalid. You cannot change the file format.

What about partitions? When configuring a partition table, what type of partition file system is selected? Fdisk-l check

For example, you can perform operations on/dev/sda as follows:
Fdisk/dev/sda
P (print the partition table of this disk)
L (list supported file system types)

During Ubuntu installation, When you select a partition, multiple NTFS files are formatted as EXT4, which cannot be undone. How can we recover the data now?

This should not work. Even the data recovery software only restores the deleted data. You can directly format the data and cannot recover it.