Disk format, mount and unload, and partition table Fstab

First, the format of the disk

After we use the FDISK command to partition the disk, the disk is still not able to be used directly, the disk needs to be formatted, and the essence of formatting is to install the file system for the disk

We use the command: MKE2FS to install the file system for the CentOS system, the following is a look at the common options for MAK2FS:

-B: The size of each block is set at the time of partitioning, and the size of each chunk currently supported is 1024, 2048, 4096

-I: Sets the size of the inode (the storage domain for file meta information)

-N: Sets the number of inode (in case the default inode number is insufficient)

-C: Check disk for problems before formatting

-L: Default label for this partition

-j: Creating a ext3 format partition

-T: Specifies the type of file system (ext2, Ext3, EXT4)

-M: Specifies the percentage of disk that is reserved to administrators for the MKE2FS command (EXT4 file system) when formatting

example, the partition SDB1 is formatted as a EXT4 file system: Mke2fs-t EXT4/DEV/SDB1

The specification of the size of the block and the label of the specified partition are similar to the usage, not to repeat

Command: E2label + partition name

View or modify the label of a partition

Second, the disk mount and unload

After the disk format, you need to mount it to use, you can say Fdisk, MKE2FS, mount these three commands are inseparable (of course, in addition to mount the optical drive). The formatted disk is actually a block device file (that is, a hardware device) that needs to be mounted for use, and we need to set up a mount point (in the form of a directory) when we mount it, and if we mount a partition to this directory, the data we write to that directory will be written to this partition. Note: The contents of this directory are not visible after mounting, the partition can be seen after unloading

Detailed command:

Mount: When using this mount alone, you can see how the disk is mounted at this time

DMESG |tail: Use this command to view errors when a disk cannot be mounted

mount/dev/sdb1/mnt/: Mount the partition/dev/sdb1 to the/mnt/directory, after the mount succeeds, use the LS command to view the contents of the mount point, which will show Lost+found

Df-h: View disk usage at this time

To prevent the disk from being identified incorrectly (mount the wrong partition), you can mount it using the UUID and label:

Command: Blkid, view the UUID and label of each partition and the file system type

Command: Mount Uuid= "...... ..... ................../mnt/...".

Command: Mount label=test/mnt/

Uninstall: Umount

This command is very simple to use, directly with the partition name or mount point, but not with the UUID and label, using the-l option can be forced to unload

Third, the partition table Fstab

When we want to enable automatic mount, the content can be written to the file

Uuid= "..."/MNT/EXT4 defaults 0 0 (...) ..... ......--------------

Or: Label=test/mnt/ext4 defaults 0 0

Or we can write the command to the file/etc/rc.d/rc.local to start it up:

Mount Uuid= "..... ................./mnt/..."....... "

Command: Mount-a, automatically mount the partitions that appear in the partition table/etc/fstab

This article is from "The Miracle Teenager" blog, please be sure to keep this source http://raffaelexr.blog.51cto.com/8555551/1720050

Disk format, mount and unload, and partition table Fstab