本篇文章主要介绍了linux如何无损调整分区大小，小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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 -hFilesystem Size Used Avail Use% Mounted on/dev/mapper/centos-root 50G 50G 19M 100% /devtmpfs 32G 0 32G 0% /devtmpfs 32G 0 32G 0% /dev/shmtmpfs 32G 2.5G 29G 8% /runtmpfs 32G 0 32G 0% /sys/fs/cgroup/dev/mapper/centos-home 476G 33M 476G 1% /home/dev/sda1 497M 238M 259M 48% /boottmpfs 6.3G 0 6.3G 0% /run/user/0
analyze
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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/homeLV Name homeVG Name centosLV UUID 1fAt1E-bQsa-1HXR-MCE2-5VZ1-xzBz-iI1SLvLV Write Access read/writeLV Creation host, time localhost, 2016-10-26 17:23:47 +0800LV Status available# open 0LV Size 475.70 GiBCurrent LE 121778Segments 1Allocation inheritRead ahead sectors auto- currently set to 256Block device 253:2--- Logical volume ---LV Path /dev/centos/rootLV Name rootVG Name centosLV UUID lD64zY-yc3Z-SZaB-dAjK-03YM-2gM8-pfj4ooLV Write Access read/writeLV Creation host, time localhost, 2016-10-26 17:23:48 +0800LV Status available# open 1LV Size 50.00 GiBCurrent LE 12800Segments 1Allocation inheritRead ahead sectors auto- currently set to 256Block 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/homeWARNING: 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/rootSize 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-rootmeta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=3276800 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0 spinodes=0data = bsize=4096 blocks=13107200, imaxpct=25 = sunit=0 swidth=0 blksnaming =version 2 bsize=4096 ascii-ci=0 ftype=0log =internal bsize=4096 blocks=6400, version=2 = sectsz=512 sunit=0 blks, lazy-count=1realtime =none extsz=4096 blocks=0, rtextents=0data blocks changed from 13107200 to 85395456
完成
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