[root@oldboyedu ~]# parted /dev/sdb #交互式开始分区
GNU Parted 3.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) help
(parted) mklabel gpt #修改分区格式为gpt
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to
continue?
Yes/No? Yes
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt #修改结果
(parted) mkpart primary 0 480 #创建第一个主分区480M。
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? Ignore #忽略提示。
(parted) mkpart primary 481 580 #创建第二个主分区100M。
Warning: You requested a partition from 481MB to 580MB (sectors 939453..1132812).
The closest location we can manage is 481MB to 481MB (sectors 940031..940031).
Is this still acceptable to you?
Yes/No? Y
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? I #忽略提示。
(parted) mkpart logic 581 600 #创建一个20M逻辑分区。
(parted) p
Model: VMware, VMware Virtual S (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 17.4kB 480MB 480MB primary
3 481MB 481MB 512B primary
2 481MB 580MB 98.6MB primary
4 581MB 600MB 18.9MB logic
(parted) rm 4 #删除
(parted) p
问题需求：刚买的服务器 4块2T刚买的，要做raid5，装系统怎么搞定？
方法1、raid里可以支持raid5后，6T，允许你把6T分成虚拟磁盘。
200G分成第一个虚拟磁盘剩下不分留着装系统后（parted）。
方法2、装系统过程中有这个功能，系统镜像支持GPT格式分区，很隐蔽。
方法3、 引导工具，进入然后用partwd分区
生产场景中分区方案：
4种。
分区知识：（1）什么是分区，为什么要分区？
（2）磁盘和分区在Linux里的命名。
（3）磁盘分区类型和特点：
（4）磁盘分区工作原理：
（5）磁盘分区实战
（6）生产场景分区方案：4种。参考前面课程
获得使用的磁盘过程====买房入住生活的过程
磁盘===房子
raid=====多套房子打通
分区=========隔断/几居室、卧室、卫生间、厨房
===============================
文件系统====装修风格
格式化过程====== 装修过程
挂载========开门，开窗住人
磁盘管理======生活收拾屋子，打扫卫生
[root@oldboyedu ~]# fdisk /dev/sdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
First sector (2048-2097151, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151): +100M
Partition 1 of type Linux and of size 100 MiB is set
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000006b6
Device Boot Start End Blocks Id System
/dev/sdb1 2048 206847 102400 83 Linux
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (2-4, default 2):
First sector (206848-2097151, default 206848):
Using default value 206848
Last sector, +sectors or +size{K,M,G} (206848-2097151, default 2097151): +100M
Partition 2 of type Linux and of size 100 MiB is set
Command (m for help): p
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000006b6
Device Boot Start End Blocks Id System
/dev/sdb1 2048 206847 102400 83 Linux
/dev/sdb2 206848 411647 102400 83 Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@oldboyedu ~]# ls -l /dev/sdb*
brw-rw---- 1 root disk 8, 16 Mar 29 11:31 /dev/sdb
brw-rw---- 1 root disk 8, 17 Mar 29 11:31 /dev/sdb1
brw-rw---- 1 root disk 8, 18 Mar 29 11:31 /dev/sdb2
[root@oldboyedu ~]# mkfs -t ext4 /dev/sdb1
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
25688 inodes, 102400 blocks
5120 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=33685504
13 block groups
8192 blocks per group, 8192 fragments per group
1976 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Allocating group tables: done
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
[root@oldboyedu ~]# mount -t ext4 /dev/sdb1 /mnt #挂载到/mnt
[root@oldboyedu ~]# df -h #查看挂载结果
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 19G 1.9G 18G 10% /
devtmpfs 980M 5.0M 975M 1% /dev
tmpfs 991M 0 991M 0% /dev/shm
tmpfs 991M 18M 973M 2% /run
tmpfs 991M 0 991M 0% /sys/fs/cgroup
/dev/sda1 253M 136M 118M 54% /boot
tmpfs 199M 0 199M 0% /run/user/0
tmpfs 199M 0 199M 0% /run/user/1000
/dev/sdb1 93M 1.6M 85M 2% /mnt #<====已挂载。
[root@oldboyedu ~]# cat /proc/mounts #查看挂载结果
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
configfs /sys/kernel/config configfs rw,relatime 0 0
/dev/sda3 / xfs rw,relatime,attr2,inode64,noquota 0 0
systemd-1 /proc/sys/fs/binfmt_misc autofs rw,relatime,fd=32,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=19277 0 0
hugetlbfs /dev/hugepages hugetlbfs rw,relatime 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
mqueue /dev/mqueue mqueue rw,relatime 0 0
/dev/sda1 /boot xfs rw,relatime,attr2,inode64,noquota 0 0
tmpfs /run/user/0 tmpfs rw,nosuid,nodev,relatime,size=202812k,mode=700 0 0
tmpfs /run/user/1000 tmpfs rw,nosuid,nodev,relatime,size=202812k,mode=700,uid=1000,gid=1000 0 0
/dev/sdb1 /mnt ext4 rw,relatime,data=ordered 0 0 #<====已挂载。
[root@oldboyedu ~]# touch /mnt/oldboy
[root@oldboyedu ~]# ls /mnt
lost+found oldboy
1.文件系统：
什么是文件系统？
是计算机存储和组织数据的方法或者机制。
2.为什么需要文件系统？
磁盘，物质介质，磁粒子物理元素。硬件需要软件驱动使用，磁盘需要文件系统驱动。
文件系统实现通过磁盘管理规划，存取数据。
3.文件系统都有那些类型？
windows NTFS/ fat32， msdos
Linux 最早期的是ext（2.3.4) 版本升级关系 | Xfs（c7）
4.创建文件系统实际：
4.文件系统原理（ext文件系统）
5.企业中如何选择文件系统.
6.如何优化文件系统？
