CentOS lvm虚拟磁盘管理（vg_centos-lv_root扩充和缩小）
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 #仅限ext4 lvreduce -L 50G /dev/testvg/testlv
xfs缩容，只能重新创建lv逻辑分区来实现缩容，可以参考文章后面xfs的链接
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 #仅限ext4
# 或者用 lvresize -L 10G /dev/testvg/testlv
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 #仅限ext4
查看空闲的空间
[root@centos6 ~]# vgdisplay|grep "Free PE" Free PE / Size 61297 / 239.44 GiB
PV拓展和缩小
# 在resize 之前需要调整lv的空间，把lvresize缩小的空间移动到最后 pvs -v --segments /dev/sdb1 pvmove --alloc anywhere /dev/sdb1:1000-1999 /dev/sdb10-999 #https://blog.csdn.net/allway2/article/details/102660278 #重设物理卷大小 https://www.jianshu.com/p/9fdafdb198a9 pvresize --setphysicalvolumesize 20G /dev/sdb1
更多lvm命令参考 https://www.systutorials.com/docs/linux/man/8-lvm/
XFS文件系统
参考 https://www.cnblogs.com/Alwayslearn/p/16799747.html
虚拟磁盘
扩大缩小qcow2虚拟机镜像大小
[root@localhost p2v-pool]# virt-df -h centos7-sda
Filesystem Size Used Available Use%
centos7-sda:/dev/sda1 192M 11M 181M 6%
centos7-sda:/dev/sda2 1.0G 134M 912M 13%
centos7-sda:/dev/centos00/home 15G 240K 15G 1%
centos7-sda:/dev/centos00/root 15G 1.2G 14G 9%
[root@localhost p2v-pool]# qemu-img create -f qcow2 centos7.qcow2 37G
Formatting 'centos7.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=39728447488 lazy_refcounts=off refcount_bits=16
[root@localhost p2v-pool]# virt-resize --expand /dev/sda3 centos7-sda centos7.qcow2
[ 0.0] Examining centos7-sda
virt-resize: error: You cannot use --expand when there is no surplus space
to expand into. You need to make the target disk larger by at least
624.3M.
If reporting bugs, run virt-resize with debugging enabled and include the
complete output:
virt-resize -v -x [...]
[root@localhost p2v-pool]# rm -f centos7.qcow2
[root@localhost p2v-pool]# qemu-img create -f qcow2 centos7.qcow2 38G
Formatting 'centos7.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=40802189312 lazy_refcounts=off refcount_bits=16
[root@localhost p2v-pool]# virt-resize --expand /dev/sda3 centos7-sda centos7.qcow2
[ 0.0] Examining centos7-sda
**********
Summary of changes:
/dev/sda1: This partition will be left alone.
/dev/sda2: This partition will be left alone.
/dev/sda3: This partition will be resized from 36.4G to 36.7G. The LVM PV
on /dev/sda3 will be expanded using the ‘pvresize’ method.
**********
[ 3.7] Setting up initial partition table on centos7.qcow2
[ 14.9] Copying /dev/sda1
[ 15.2] Copying /dev/sda2
[ 16.7] Copying /dev/sda3
100% [######################################################################################################################################################################################################] 00:00
[ 102.3] Expanding /dev/sda3 using the ‘pvresize’ method
Resize operation completed with no errors. Before deleting the old disk,
carefully check that the resized disk boots and works correctly.
https://blog.csdn.net/tutucute0000/article/details/38414449
https://zhuanlan.zhihu.com/p/158123147
https://www.cnblogs.com/wang_yb/p/3980599.html
