版权声明:本文为原创文章,转载请注明作者薄海,网址链接,联系方式邮箱[email protected]。QQ-1511777。 https://blog.csdn.net/stillit/article/details/51382380
LVM总共700G,其中sda系统盘,sdb 536G,sdc 214G,实际数据使用空间164G,想要缩减空间做删除盘的操作。
1、查看分区情况
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
7xxG 169G xxG 65% /
/dev/sda1 99M 13M 81M 14% /boot
tmpfs 7.9G 0 7.9G 0% /dev/shm
说明:斜体表示不确定具体数据,仅供参考
# fdisk -l
Disk /dev/sda: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 3916 31350847+ 8e Linux LVM
Disk /dev/sdb: 536.8 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table
Disk /dev/sdc: 214.7 GB, 214748364800 bytes
255 heads, 63 sectors/track, 26108 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdc doesn't contain a valid partition table
由于是删除挂载在/目录的盘,不能在线删盘,需要进入安全模式
重启操作系统,从安装光盘启动
输入linux rescue 进入linux 安全模式,选择不挂载 NO-NO-NO
2、取消挂载,进行磁盘检测
lvm vgscan -v
lvm vgchange -a y
lvm lvs -all
e2
fsck -f
/dev/mapper/VolGroup00-LogVol00 磁盘检测
3、对逻辑卷重定义大小
resize2fs -p
/dev/mapper/VolGroup00-LogVol00 300G 重定义大小,缩至300G
lvreduce -L 310G
/dev/mapper/VolGroup00-LogVol00 重定义大小
由700G变成300G,大约要删除400G,就算400G的盘子数据满了,也可以全部移走。
4、查看物理卷情况
pvdisplay -m
--- Physical volume ---
PV Name /dev/sda2
VG Name VolGroup00
PV Size 29.90 GB / not usable 24.06 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 956
Free PE 0
Allocated PE 956
PV UUID cjwiEg-ZlfV-e1q0-VqpF-whuF-BAq4-ECOsrx
--- Physical Segments ---
Physical extent 0 to 892:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 0 to 892
Physical extent 893 to 955:
Logical volume /dev/VolGroup00/LogVol01
Logical extents 0 to 62
--- Physical volume ---
PV Name /dev/sdb
VG Name VolGroup00
PV Size 500.00 GB / not usable 32.00 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 15999
Free PE 6972
Allocated PE 9027
PV UUID ltIgU5-6uep-nusm-IvdZ-xby4-cVjT-2RQBrf
--- Physical volume ---
PV Name /dev/sdc
VG Name VolGroup00
PV Size 200.00 GB / not usable 32.00 MB
Allocatable yes 激活状态,可写入
PE Size (KByte) 32768
Total PE 15999 总共15999PE
Free PE 15999 空闲15999PE,也就是说这块硬盘是空的
Allocated PE 9027
PV UUID ltIgU5-6uep-nusm-IvdZ-xby4-cVjT-2RQBrf
--- Physical Segments ---
Physical extent 0 to 9026:
Logical volume /dev/VolGroup00/LogVol00
Logical extents 893 to 9919
Physical extent 9027 to 15998:
FREE
5、移动数据,将要删除的盘的数据移动到别的盘
pvmove -i /dev/sdc
no data to move for VolGroup00
这一步,非常重要,如果盘子里面有数据,不做这一步,会造成数据丢失
6、注销要删除的硬盘/dev/sdc
pvchange -xn /dev/sdc 注销sdc
pvdisplay -m
--- Physical volume ---
PV Name /dev/sdc
VG Name VolGroup00
PV Size 200.00 GB / not usable 32.00 MB
Allocatable NO //不是激活状态了
PE Size (KByte) 32768
Total PE 15999
Free PE 15999
Allocated PE 0
7、将硬盘或分区从逻辑卷组中删除,并删除物理盘
vgreduce VolGroup00 /dev/sdc //从逻辑卷组中删除
pvremove /dev/sdc 删除物理卷
pvdisplay
sdc 已经看不到了。
8、查看结果
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
291G 181G 96G 66% /
/dev/sda1 99M 13M 81M 14% /boot
tmpfs 7.9G 0 7.9G 0% /dev/shm
启动数据库正常。主从复制线程正常(从)。