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day22 分区:fdisk、parted

day22 分区:fdisk、parted

作者: 藏鋒1013 | 来源:发表于2019-03-31 13:52 被阅读0次

fdisk分区工具介绍

fdisk - Partition table manipulator for Linux

Linux下最常用的分区工具,一般是装完系统后进行分区。装系统之前的分区

多数都是系统ISO里面的分区工具,或者raid里的小磁盘。

fdisk只能root权限用户使用。

fdisk适合于对装系统后的剩余空间进行分区,例如:安装系统时没有全部分区,或者安装系统后添加新磁盘。

fdisk支持mbr分区表(2TB以内)

fdisk分区的实质

用fdisk分区的实质,就是修改0磁头0磁道1扇区的前446字节之后的64字节的分区表信息。

可以使用fdisk分区的磁盘大小必须小于2T,如果大于2T,分区就用parted(gpt)

parted:

      parted是一个磁盘分区管理工具,它比fdisk更加灵活,功能也更丰富,同时还支持GUID分区表,这在IA64平台上管理磁盘时非常有用,他同时还支持交互模式和非交互模式,它除了能够进行分区的添加,删除等常见的操作外,还可以移动分区,制作文件系统,调整文件系统大小,复制文件系统。

实践:

创建分区:

[root@oldboyedu ~]# fdisk /dev/sdb      #<===查看当前磁盘

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   #<===新建一个分区

Partition type:

  p  primary (0 primary, 0 extended, 4 free)

  e  extended

Select (default p): p  #<===打印分区表

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    #<===查看分区

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#<===新建分区

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 ~]# fdisk /dev/sdb  #<===查看当前磁盘

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): l  #<==显示磁盘信息

0  Empty          24  NEC DOS        81  Minix / old Lin bf  Solaris       

1  FAT12          27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-

2  XENIX root      39  Plan 9          83  Linux          c4  DRDOS/sec (FAT-

3  XENIX usr      3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-

4  FAT16 <32M      40  Venix 80286    85  Linux extended  c7  Syrinx       

5  Extended        41  PPC PReP Boot  86  NTFS volume set da  Non-FS data   

6  FAT16          42  SFS            87  NTFS volume set db  CP/M / CTOS / .

7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility 

8  AIX            4e  QNX4.x 2nd part 8e  Linux LVM      df  BootIt       

9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS access   

a  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O       

b  W95 FAT32      51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor     

c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fs       

e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD        ee  GPT           

f  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD        ef  EFI (FAT-12/16/

10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b

11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor     

12  Compaq diagnost 5c  Priam Edisk    a9  NetBSD          f4  SpeedStor     

14  Hidden FAT16 <3 61  SpeedStor      ab  Darwin boot    f2  DOS secondary 

16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS   

17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs        fc  VMware VMKCORE

18  AST SmartSleep  65  Novell Netware  b8  BSDI swap      fd  Linux raid auto

1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep       

1c  Hidden W95 FAT3 75  PC/IX          be  Solaris boot    ff  BBT           

1e  Hidden W95 FAT1 80  Old Minix     

Command (m for help): p      #<==打印分区表

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: 0xbc9b0906

  Device Boot      Start        End      Blocks  Id  System

/dev/sdb1            2048      309247      153600  83  Linux

/dev/sdb2          309248      616447      153600  83  Linux

/dev/sdb3          616448      923647      153600  83  Linux

/dev/sdb4          923648    2097151      586752    5  Extended

/dev/sdb5          925696    1232895      153600  83  Linux

/dev/sdb6        1234944    1542143      153600  83  Linux

/dev/sdb7        1544192    1851391      153600  83  Linux

Command (m for help): t  #<==更改分区系统id

Partition number (1-7, default 7): 7

Hex code (type L to list all codes): L

0  Empty          24  NEC DOS        81  Minix / old Lin bf  Solaris       

1  FAT12          27  Hidden NTFS Win 82  Linux swap / So c1  DRDOS/sec (FAT-

2  XENIX root      39  Plan 9          83  Linux          c4  DRDOS/sec (FAT-

3  XENIX usr      3c  PartitionMagic  84  OS/2 hidden C:  c6  DRDOS/sec (FAT-

4  FAT16 <32M      40  Venix 80286    85  Linux extended  c7  Syrinx       

5  Extended        41  PPC PReP Boot  86  NTFS volume set da  Non-FS data   

6  FAT16          42  SFS            87  NTFS volume set db  CP/M / CTOS / .

7  HPFS/NTFS/exFAT 4d  QNX4.x          88  Linux plaintext de  Dell Utility 

8  AIX            4e  QNX4.x 2nd part 8e  Linux LVM      df  BootIt       

9  AIX bootable    4f  QNX4.x 3rd part 93  Amoeba          e1  DOS access   

a  OS/2 Boot Manag 50  OnTrack DM      94  Amoeba BBT      e3  DOS R/O       

b  W95 FAT32      51  OnTrack DM6 Aux 9f  BSD/OS          e4  SpeedStor     

c  W95 FAT32 (LBA) 52  CP/M            a0  IBM Thinkpad hi eb  BeOS fs       

e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a5  FreeBSD        ee  GPT           

f  W95 Ext'd (LBA) 54  OnTrackDM6      a6  OpenBSD        ef  EFI (FAT-12/16/

10  OPUS            55  EZ-Drive        a7  NeXTSTEP        f0  Linux/PA-RISC b

11  Hidden FAT12    56  Golden Bow      a8  Darwin UFS      f1  SpeedStor     

12  Compaq diagnost 5c  Priam Edisk    a9  NetBSD          f4  SpeedStor     

14  Hidden FAT16 <3 61  SpeedStor      ab  Darwin boot    f2  DOS secondary 

16  Hidden FAT16    63  GNU HURD or Sys af  HFS / HFS+      fb  VMware VMFS   

17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs        fc  VMware VMKCORE

18  AST SmartSleep  65  Novell Netware  b8  BSDI swap      fd  Linux raid auto

1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid fe  LANstep       

1c  Hidden W95 FAT3 75  PC/IX          be  Solaris boot    ff  BBT           

1e  Hidden W95 FAT1 80  Old Minix     

Hex code (type L to list all codes): 8e

Changed type of partition 'Linux' to 'Linux LVM'

Command (m for help): p   #<==打印分区表

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: 0xbc9b0906

  Device Boot      Start        End      Blocks  Id  System

/dev/sdb1            2048      309247      153600  83  Linux

/dev/sdb2          309248      616447      153600  83  Linux

/dev/sdb3          616448      923647      153600  83  Linux

/dev/sdb4          923648    2097151      586752    5  Extended

/dev/sdb5          925696    1232895      153600  83  Linux

/dev/sdb6        1234944    1542143      153600  83  Linux

/dev/sdb7        1544192    1851391      153600  8e  Linux LVM

Command (m for help):

dd if=/dev/sda of=/dev/sdc    bs=512    count=10240

    来源      生成文件系统  block大小  块个数

[root@oldboyedu ~]# dd if=/dev/sda of=/dev/sdc    bs=512    count=10240  #<==生成文件系统

10240+0 records in

10240+0 records out

5242880 bytes (5.2 MB) copied, 0.0810606 s, 64.7 MB/s

[root@oldboyedu ~]# ls -l /dev/sdc  #<==查看分区前的设备的状态

-rw-r--r-- 1 root root 5242880 Mar 29 09:55 /dev/sdc

[root@oldboyedu ~]# file /dev/sdc

/dev/sdc: x86 boot sector; partition 1: ID=0x83, active, starthead 32, startsector 2048, 524288 sectors; partition 2: ID=0x82, starthead 194, startsector 526336, 1572864 sectors; partition 3: ID=0x83, starthead 170, startsector 2099200, 39843840 sectors, code offset 0x63

[root@oldboyedu ~]# cat /proc/partitions

major minor  #blocks  name

  8      16    1048576 sdb

  8      17    153600 sdb1

  8      18    153600 sdb2

  8      19    153600 sdb3

  8      20          1 sdb4

  8      21    153600 sdb5

  8      22    153600 sdb6

  8      23    153600 sdb7

  8        0  20971520 sda

  8        1    262144 sda1

  8        2    786432 sda2

  8        3  19921920 sda3

  11        0    1048575 sr0

[root@oldboyedu ~]# partprobe /dev/sdb  #<==更新内核的硬盘分区表信息

用parted分区;

[root@oldboyedu ~]# parted /dev/sdb  #<==对/dev下的sdb分区

GNU Parted 3.1

Using /dev/sdb

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) help  #<==查看帮助

  align-check TYPE N                        check partition N for TYPE(min|opt) alignment

  help [COMMAND]                          print general help, or help on COMMAND

  mklabel,mktable LABEL-TYPE              create a new disklabel (partition table)

  mkpart PART-TYPE [FS-TYPE] START END    make a partition

  name NUMBER NAME                        name partition NUMBER as NAME

  print [devices|free|list,all|NUMBER]    display the partition table, available devices, free space, all found

        partitions, or a particular partition

  quit                                    exit program

  rescue START END                        rescue a lost partition near START and END

  resizepart NUMBER END                    resize partition NUMBER

  rm NUMBER                                delete partition NUMBER

  select DEVICE                            choose the device to edit

  disk_set FLAG STATE                      change the FLAG on selected device

  disk_toggle [FLAG]                      toggle the state of FLAG on selected device

  set NUMBER FLAG STATE                    change the FLAG on partition NUMBER

  toggle [NUMBER [FLAG]]                  toggle the state of FLAG on partition NUMBER

  unit UNIT                                set the default unit to UNIT

  version                                  display the version number and copyright information of GNU Parted

(parted) mklabel gpt    #<==创建分区表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      #<==Yes                                                       

(parted) p           #<==显示分区表信息                                                    

Model: VMware, VMware Virtual S (scsi)  #<==磁盘型号,这里采用VMware虚拟化演示

Disk /dev/sdb: 1074MB  #<==磁盘大小

Sector size (logical/physical): 512B/512B   #<==扇区大小

Partition Table: gpt   #<==分区表类型

Disk Flags:

Number  Start  End  Size  File system  Name  Flags

(parted) p     #<==显示分区表信息                                                          

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

(parted)                                                                 

(parted) mkpart primary 481 580      #<==创建主分区,大小为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? yes                                                             

Warning: The resulting partition is not properly aligned for best performance.

Ignore/Cancel? I    #<==输入Ignore忽略警告

(parted) p             #<==显示分区表信息                                            

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

(parted) mkpart logic 581 600

(parted) p                 #<==显示分区表信息                                                

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) help                                                           

  align-check TYPE N                        check partition N for TYPE(min|opt) alignment

  help [COMMAND]                          print general help, or help on COMMAND

  mklabel,mktable LABEL-TYPE              create a new disklabel (partition table)

  mkpart PART-TYPE [FS-TYPE] START END    make a partition

  name NUMBER NAME                        name partition NUMBER as NAME

  print [devices|free|list,all|NUMBER]    display the partition table, available devices, free space, all found

        partitions, or a particular partition

  quit                                    exit program

  rescue START END                        rescue a lost partition near START and END

  resizepart NUMBER END                    resize partition NUMBER

  rm NUMBER                                delete partition NUMBER

  select DEVICE                            choose the device to edit

  disk_set FLAG STATE                      change the FLAG on selected device

  disk_toggle [FLAG]                      toggle the state of FLAG on selected device

  set NUMBER FLAG STATE                    change the FLAG on partition NUMBER

  toggle [NUMBER [FLAG]]                  toggle the state of FLAG on partition NUMBER

  unit UNIT                                set the default unit to UNIT

  version                                  display the version number and copyright information of GNU Parted

(parted) rm 4             #<==删除                                               

(parted) p                 #<==显示分区表信息                                                

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

交互式分区:

[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    #<==磁盘创建GPT分区表,大于2G的磁盘必须执行这一步                                                

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              

修改分区格式:

(parted) mklabel msdos     #<==修改分区表格式

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? Y                                                           

(parted) p                                                               

Model: VMware, VMware Virtual S (scsi)

Disk /dev/sdb: 1074MB

Sector size (logical/physical): 512B/512B

Partition Table: msdos    #<==修改结果

Disk Flags:

fsck:检查并修复Linux文件系统

[root@oldboyedu ~]# mkfs -t ext4 /dev/sdb1 #格式化ext4文件系统 mkfs.ext4

其实关键就是生成一定数量的Inode和Block。

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

挂载: 

[root@oldboyedu ~]# mount  /dev/sdb1 /mnt #<==临时挂载到/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  #<==测试。

[root@oldboyedu ~]# ls /mnt

lost+found  oldboy

卸载文件系统:

[root@oldboyedu /mnt]# umount /mnt

umount: /mnt: target is busy.

        (In some cases useful info about processes that use

        the device is found by lsof(8) or fuser(1))

[root@oldboyedu /mnt]# pwd

/mnt

You have new mail in /var/spool/mail/root

[root@oldboyedu /mnt]# umount -lf /mnt    #<==强制卸载

[root@oldboyedu /mnt]# df -h    #<==查看

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

[root@oldboyedu ~]# mount /dev/sdb2 /opt   #<==没有格式化没法挂载

mount: /dev/sdb2 is write-protected, mounting read-only

mount: unknown filesystem type '(null)'

[root@oldboyedu ~]# mkfs.xfs /dev/sdb2  #<==格式化xfs文件系统

meta-data=/dev/sdb2              isize=512    agcount=4, agsize=6400 blks

        =                      sectsz=512  attr=2, projid32bit=1

        =                      crc=1        finobt=0, sparse=0

data    =                      bsize=4096  blocks=25600, imaxpct=25

        =                      sunit=0      swidth=0 blks

naming  =version 2              bsize=4096  ascii-ci=0 ftype=1

log      =internal log          bsize=4096  blocks=855, version=2

        =                      sectsz=512  sunit=0 blks, lazy-count=1

realtime =none                  extsz=4096  blocks=0, rtextents=0

[root@oldboyedu ~]# mount -t xfs /dev/sdb2 /opt

You have new mail in /var/spool/mail/root

[root@oldboyedu ~]# df -h|grep opt

/dev/sdb2        97M  5.3M  92M  6% /opt

[root@oldboyedu ~]# touch /opt/oldgirl

[root@oldboyedu ~]# ls /opt

oldgirl

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