查看磁盘使用情况
[root@centos6 ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_centos-lv_root 148G 49G 92G 35% / tmpfs 3.9G 0 3.9G 0% /dev/shm /dev/sda1 477M 88M 360M 20% /boot /dev/mapper/vg_centos-lv_home 69G 11G 55G 16% /home
查看分区情况
[root@centos6 ~]# fdisk -l Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0xcad4ebea Device Boot Start End Blocks Id System /dev/sda1 * 1 64 512000 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 64 60802 487873536 8e Linux LVM Disk /dev/mapper/vg_centos-lv_root: 161.1 GB, 161061273600 bytes 255 heads, 63 sectors/track, 19581 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_centos-lv_swap: 6257 MB, 6257901568 bytes 255 heads, 63 sectors/track, 760 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Disk /dev/mapper/vg_centos-lv_home: 75.2 GB, 75161927680 bytes 255 heads, 63 sectors/track, 9137 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000
查看已经存在的PV
[root@centos6 ~]# pvdisplay --- Physical volume --- PV Name /dev/sda2 VG Name vg_centos PV Size 465.27 GiB / not usable 3.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 119109 Free PE 61297 Allocated PE 57812 PV UUID MBViEk-fqNP-FUlc-PB3X-gOfi-x0pI-z7Bzbc
查看VG
[root@centos6 ~]# vgdisplay --- Volume group --- VG Name vg_centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 8 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 465.27 GiB PE Size 4.00 MiB Total PE 119109 Alloc PE / Size 57812 / 225.83 GiB Free PE / Size 61297 / 239.44 GiB VG UUID Xbfben-cWfV-XN6s-3SqM-SQOJ-tXPY-nCCFqC
查看LV
[root@centos6 ~]# lvdisplay --- Logical volume --- LV Path /dev/vg_centos/lv_root LV Name lv_root VG Name vg_centos LV UUID WmZIWz-aiAY-CUPs-bYnH-4iyy-yKeG-b5onvL LV Write Access read/write LV Creation host, time centos, 2019-02-24 04:08:00 +0800 LV Status available # open 1 LV Size 150.00 GiB Current LE 38400 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/vg_centos/lv_home LV Name lv_home VG Name vg_centos LV UUID sA7I2d-44Fm-HUBi-BAbK-F1ST-fSTW-mmBzx0 LV Write Access read/write LV Creation host, time centos, 2019-02-24 04:08:18 +0800 LV Status available # open 1 LV Size 70.00 GiB Current LE 17920 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Logical volume --- LV Path /dev/vg_centos/lv_swap LV Name lv_swap VG Name vg_centos LV UUID OBXMGc-pGZK-b66R-i072-Jnfi-t07d-NHMiW0 LV Write Access read/write LV Creation host, time centos, 2019-02-24 04:12:30 +0800 LV Status available # open 2 LV Size 5.83 GiB Current LE 1492 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1
缩小LV（非root分区）
lvreduce -L 50G -f -r /dev/vg/lv # 减少到50G lvreduce -L -10G -f -r /dev/vg/lv # 减10G #相当于以下3条命令 e2fsck -f /dev/testvg/testlv resize2fs /dev/testvg/testlv 50G lvreduce -L 50G /dev/testvg/testlv
拓展LV
lvextend -L +10G -f -r /dev/testvg/testlv #增加10G lvextend -L 100G -f -r /dev/testvg/testlv #空间扩大到100G # 相当于 lvextend -L +10G /dev/testvg/testlv resize2fs -f /dev/testvg/testlv 30G
root分区拓展和缩小操作，不能在本机一次性完成，操作后不能进行resize
我们可以进入救援模式或者将硬盘拆下来到其他的centos或者archlinux系统下resize
e2fsck -f /dev/mapper/vg_host01-lv_root
resize2fs -p /dev/mapper/vg_host01-lv_root 50G
查看空闲的空间
[root@centos6 ~]# vgdisplay|grep "Free PE" Free PE / Size 61297 / 239.44 GiB