Disk management quotas and raid configuration

Disk management quota and raid configuration disk structure

MBR and disk partition representation

Master Boot record (MBR:Master Boot Record)

MBR is located in the first physical sector of the hard disk. The MBR contains the main boot program and the partition table of the hard disk.

The partition table has 4 partition record areas, each accounting for 16 bytes

Hard drives, partitions and other devices are represented as files in Linux

Disk partition structure

There are only four primary partitions in the hard disk, so the serial numbers of primary and extended partitions are limited to 1-4.

The sequence number of the extended partition subdivided into logical partitions will always start at 5.

Detect and confirm new hard drive-fdisk

View or manage disk partition fdisk-l

Common commands in interactive mode

M help p print display n create new new partition d delete partition t conversion format w save configuration Q exit easy operation as shown in the figure

Format mkfs

Mkfs-t file system type partition device

Create a swap file

Mkswap Partition device

Mount-mount unmount file system-umount

Mount [- t type] storage device mount point

Basic Concepts of LVM Mechanism

PV (physical volume) VG (volume group) LV (logical volume)

Main command

Overview of disk quota

Conditions for realizing disk quota: Linux kernel is required to support the installation of xfsprogs and quota packages

Characteristics of Linux disk quota

Scope: for the specified file system (partition)

Quota object: user account, group account

Type of limit: disk capacity, number of files

Limit method: soft limit, hard limit (soft limit