如何扩展Liunx系统分区大小

作者:IT邦德
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在这里插入图片描述

文章目录

  • 前言
    • 1.分区大小
    • 2.裸盘划分
    • 3.创建 PV
    • 4.扩展逻辑卷
    • 5.再次确认分区大小

前言

近日服务器的根目录快满了,仔细一查看使用的是逻辑卷,本文总结了以下扩展分区的方法, 本次扩展的是根分区

1.分区大小

[root@rhel76 ~]# df -Th
Filesystem            Type      Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root xfs        30G  4.3G   26G  15% /
devtmpfs              devtmpfs  2.0G     0  2.0G   0% /dev
tmpfs                 tmpfs     2.0G     0  2.0G   0% /dev/shm
tmpfs                 tmpfs     2.0G   13M  2.0G   1% /run
tmpfs                 tmpfs     2.0G     0  2.0G   0% /sys/fs/cgroup
/dev/sda1             xfs       950M  164M  786M  18% /boot
/dev/mapper/rhel-u01  xfs        28G   33M   28G   1% /u01
tmpfs                 tmpfs     394M  4.0K  394M   1% /run/user/42
tmpfs                 tmpfs     394M   48K  394M   1% /run/user/0

可以看出/分区已经明明显不足,需要扩展

如何扩展Liunx系统分区大小_第1张图片

2.裸盘划分

[root@rhel76 ~]# ll /dev/sd*
brw-rw----. 1 root disk 8,  0 Nov 28 23:34 /dev/sda
brw-rw----. 1 root disk 8,  1 Nov 28 23:34 /dev/sda1
brw-rw----. 1 root disk 8,  2 Nov 28 23:34 /dev/sda2
brw-rw----. 1 root disk 8, 16 Nov 28 23:34 /dev/sdb

如何扩展Liunx系统分区大小_第2张图片

[root@rhel76 ~]# fdisk /dev/sdb
[root@rhel76 ~]# 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.

Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xa1773dc6.

Command (m for help): n
Partition type:
   p   primary (0 primary, 0 extended, 4 free)
   e   extended
Select (default p): 
Using default response p
Partition number (1-4, default 1): 1
First sector (2048-41943039, default 2048): 
Using default value 2048
Last sector, +sectors or +size{
     K,M,G} (2048-41943039, default 41943039): 
Using default value 41943039
Partition 1 of type Linux and of size 20 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

[root@rhel76 ~]# ll /dev/sd*
brw-rw----. 1 root disk 8,  0 Nov 28 23:34 /dev/sda
brw-rw----. 1 root disk 8,  1 Nov 28 23:34 /dev/sda1
brw-rw----. 1 root disk 8,  2 Nov 28 23:34 /dev/sda2
brw-rw----. 1 root disk 8, 16 Nov 28 23:49 /dev/sdb
brw-rw----. 1 root disk 8, 17 Nov 28 23:49 /dev/sdb1

[root@rhel76 ~]# fdisk -l | grep dev
Disk /dev/sdb: 21.5 GB, 21474836480 bytes, 41943040 sectors
/dev/sdb1            2048    41943039    20970496   83  Linux
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 sectors
/dev/sda1   *        2048     1953791      975872   83  Linux
/dev/sda2         1953792   125829119    61937664   8e  Linux LVM
Disk /dev/mapper/rhel-root: 31.4 GB, 31415336960 bytes, 61358080 sectors
Disk /dev/mapper/rhel-swap: 2000 MB, 2000683008 bytes, 3907584 sectors
Disk /dev/mapper/rhel-u01: 30.0 GB, 30001856512 bytes, 58597376 sectors

如何扩展Liunx系统分区大小_第3张图片

3.创建 PV

[root@rhel76 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda2  rhel lvm2 a--  <59.07g 4.00m

[root@rhel76 ~]# pvcreate /dev/sdb1
  Physical volume "/dev/sdb1" successfully created.

[root@rhel76 ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree  
  /dev/sda2  rhel lvm2 a--  <59.07g   4.00m
  /dev/sdb1       lvm2 ---  <20.00g <20.00g

4.扩展逻辑卷

[root@rhel76 ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  rhel   1   3   0 wz--n- <59.07g 4.00m
  
[root@rhel76 ~]# vgextend rhel /dev/sdb1

[root@rhel76 ~]# vgextend rhel /dev/sdb1
  Volume group "rhel" successfully extended
[root@rhel76 ~]# vgs
  VG   #PV #LV #SN Attr   VSize  VFree 
  rhel   2   3   0 wz--n- 79.06g 20.00g


[root@rhel76 ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree  
  jem_vg   1   0   0 wz--n- <20.00g <20.00g
  rhel     1   3   0 wz--n- <59.07g   4.00m

[root@rhel76 ~]# lvdisplay
 --- Logical volume ---
  LV Path                /dev/rhel/root
  LV Name                root
  VG Name                rhel
  LV UUID                fB06rl-92CE-trM6-e2tM-pP4o-6SKt-p03lGC
  LV Write Access        read/write
  LV Creation host, time rhel76, 2021-06-26 22:04:57 +0000
  LV Status              available
  # open                 1
  LV Size                <29.26 GiB
  Current LE             7490
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0
  
[root@rhel76 ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root rhel -wi-ao---- <29.26g                                                    
  swap rhel -wi-ao----   1.86g                                                    
  u01  rhel -wi-ao----  27.94g     

[root@rhel76 ~]# lvextend -L +18G /dev/rhel/root
  Size of logical volume rhel/root changed from <29.26 GiB (7490 extents) to <47.26 GiB (12098 extents).
  Logical volume rhel/root successfully resized.
  
使用以下命令刷新lv
[root@rhel76 ~]# xfs_growfs /dev/rhel/root
meta-data=/dev/mapper/rhel-root  isize=512    agcount=4, agsize=1917440 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=7669760, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=3745, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 7669760 to 12388352

5.再次确认分区大小

[root@rhel76 ~]# df -TH
Filesystem            Type      Size  Used Avail Use% Mounted on
/dev/mapper/rhel-root xfs        51G  4.4G   47G   9% /
devtmpfs              devtmpfs  2.1G     0  2.1G   0% /dev
tmpfs                 tmpfs     2.1G     0  2.1G   0% /dev/shm
tmpfs                 tmpfs     2.1G   14M  2.1G   1% /run
tmpfs                 tmpfs     2.1G     0  2.1G   0% /sys/fs/cgroup
/dev/sda1             xfs       996M  172M  825M  18% /boot
/dev/mapper/rhel-u01  xfs        30G   34M   30G   1% /u01
tmpfs                 tmpfs     413M  4.1k  413M   1% /run/user/42
tmpfs                 tmpfs     413M   54k  413M   1% /run/user/0

如何扩展Liunx系统分区大小_第4张图片
很明显,/ 分区由原来的30G扩展到了51G

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