linux服务器如何调整分区大小无损的方法

时间:2022-06-26 12:27:31 职场充电 我要投稿
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linux服务器如何调整分区大小无损的方法

  我们做服务器搭建维护的时候都会因为各种需求而需要调整分区大小。为了效率我们肯定要做到无损的调整,而可能很多不是很熟练的人不知道怎么调,下面小编就为大家分享下linux服务器无损调整分区大小的方法吧。

  情况:

  home:500G

  root:50G

  root分区不够用

  思路:把home分区的空间划一部分到root分区

  # 设置home分区大小为200G,释放300G空间

  $ lvreduce -L 200G /dev/centos/home

  # 将空闲空间扩展到root分区

  $ lvextend -l +100%FREE /dev/centos/root

  # 使用XFS文件系统自带的命令集增加分区空间

  $ xfs_growfs /dev/mapper/centos-root

  实例

  situation

  挂载在根目录的分区 /dev/mapper/centos-root 爆满,占用100%

  $ df -h

  Filesystem Size Used Avail Use% Mounted on

  /dev/mapper/centos-root 50G 50G 19M 100% /

  devtmpfs 32G 0 32G 0% /dev

  tmpfs 32G 0 32G 0% /dev/shm

  tmpfs 32G 2.5G 29G 8% /run

  tmpfs 32G 0 32G 0% /sys/fs/cgroup

  /dev/mapper/centos-home 476G 33M 476G 1% /home

  /dev/sda1 497M 238M 259M 48% /boot

  tmpfs 6.3G 0 6.3G 0% /run/user/0

  analyze

  挂载在根目录的分区空间太小,只有50G,而服务器 home 目录为非常用目录,挂在了近500G的空间。

  思路:从 centos-home 分区划出300G空间到 centos-root 分区。

  operation

  1.查看各分区信息

  $ lvdisplay

  --- Logical volume ---

  LV Path /dev/centos/home

  LV Name home

  VG Name centos

  LV UUID 1fAt1E-bQsa-1HXR-MCE2-5VZ1-xzBz-iI1SLv

  LV Write Access read/write

  LV Creation host, time localhost, 2016-10-26 17:23:47 +0800

  LV Status available

  # open 0

  LV Size 475.70 GiB

  Current LE 121778

  Segments 1

  Allocation inherit

  Read ahead sectors auto

  - currently set to 256

  Block device 253:2

  --- Logical volume ---

  LV Path /dev/centos/root

  LV Name root

  VG Name centos

  LV UUID lD64zY-yc3Z-SZaB-dAjK-03YM-2gM8-pfj4oo

  LV Write Access read/write

  LV Creation host, time localhost, 2016-10-26 17:23:48 +0800

  LV Status available

  # open 1

  LV Size 50.00 GiB

  Current LE 12800

  Segments 1

  Allocation inherit

  Read ahead sectors auto

  - currently set to 256

  Block device 253:0

  2.减少/home分区空间

  # 释放 /dev/centos/home 分区 300G 的空间

  # 命令设置 /dev/centos/home 分区 200G空间

  $ lvreduce -L 200G /dev/centos/home

  WARNING: Reducing active logical volume to 200.00 GiB.

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

  Do you really want to reduce centos/home? [y/n]: y

  Size of logical volume centos/home changed from 475.70 GiB (121778 extents) to 200.00 GiB (51200 extents).

  Logical volume centos/home successfully resized.

  3.增加/root分区空间

  $ lvextend -l +100%FREE /dev/centos/root

  Size of logical volume centos/root changed from 50.06 GiB (12816 extents) to 325.76 GiB (83394 extents).

  Logical volume centos/root successfully resized.

  4.扩展XFS文件空间大小

  $ xfs_growfs /dev/mapper/centos-root

  meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks

  = sectsz=512 attr=2, projid32bit=1

  = crc=0 finobt=0 spinodes=0

  data = bsize=4096 blocks=13107200, imaxpct=25

  = sunit=0 swidth=0 blks

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

  log =internal bsize=4096 blocks=6400, version=2

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

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

  data blocks changed from 13107200 to 85395456


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