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linux服務(wù)器如何調(diào)整分區(qū)大小無損的方法
我們做服務(wù)器搭建維護(hù)的時候都會因為各種需求而需要調(diào)整分區(qū)大小。為了效率我們肯定要做到無損的調(diào)整，而可能很多不是很熟練的人不知道怎么調(diào)，下面小編就為大家分享下linux服務(wù)器無損調(diào)整分區(qū)大小的方法吧。
情況：
home：500G
root：50G
root分區(qū)不夠用
思路：把home分區(qū)的空間劃一部分到root分區(qū)
# 設(shè)置home分區(qū)大小為200G，釋放300G空間
$ lvreduce -L 200G /dev/centos/home
# 將空閑空間擴(kuò)展到root分區(qū)
$ lvextend -l +100%FREE /dev/centos/root
# 使用XFS文件系統(tǒng)自帶的命令集增加分區(qū)空間
$ xfs_growfs /dev/mapper/centos-root
實例
situation
掛載在根目錄的分區(qū) /dev/mapper/centos-root 爆滿，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
掛載在根目錄的分區(qū)空間太小，只有50G，而服務(wù)器 home 目錄為非常用目錄，掛在了近500G的空間。
思路：從 centos-home 分區(qū)劃出300G空間到 centos-root 分區(qū)。
operation
1.查看各分區(qū)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.減少/home分區(qū)空間
# 釋放 /dev/centos/home 分區(qū) 300G 的空間
# 命令設(shè)置 /dev/centos/home 分區(qū) 200G空間
$ 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分區(qū)空間
$ 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.擴(kuò)展XFS文件空間大小
$ 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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