四、LVM扩展逻辑卷
我们当如何对lvm扩容呢，在vg组有空余的空间时，可以lvextend增加空间；在vg组无空间时，可以通过先增加pv，再lvextend实现扩容
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[root@localhost ~]# lvextend -L +300m /dev/libo/X Size of logical volume libo/X changed from 1.50 GiB (384 extents) to 1.79 GiB (459 extents). Logical volume X successfully resized. [root@localhost ~]# vgextend libo /dev/sdb3 Volume group "libo" successfully extended 我们把LVM逻辑卷管理及扩容（一）中创建的四个分区全部都添加给lvm X，大小为4G
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[root@localhost ~]# lvextend -L +2g /dev/libo/X Size of logical volume libo/X changed from 1.79 GiB (459 extents) to 3.79 GiB (971 extents). Logical volume X successfully resized. [root@localhost ~]# lvdisplay x Volume group "x" not found Cannot process volume group x [root@localhost ~]# lvdisplay /dev/libo/X --- Logical volume --- LV Path /dev/libo/X LV Name X VG Name libo LV UUID fpyvTb-f1Wd-OVek-5h05-3U19-gLmQ-2sBMF8 LV Write Access read/write LV Creation host, time localhost.localdomain, -04-26 12:33:53 +0800 LV Status available # open 1 LV Size 3.79 GiB Current LE 971 Segments 4 Allocation inherit Read ahead sectors auto - currently set to 8192 Block device 253:2
通过xfs_growfs对lvm进行扩容xfs_growfs -d /dev/libo/X
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[root@localhost ~]# xfs_growfs -d /dev/libo/X meta-data=/dev/mapper/libo-X isize=256 agcount=4, agsize=98304 blks = sectsz=512 attr=2, projid32bit=1 = crc=0 finobt=0 data = bsize=4096 blocks=393216, imaxpct=25 = sunit=0 swidth=0 blks naming =version 2 bsize=4096 ascii-ci=0 ftype=0 log =internal bsize=4096 blocks=2560, version=2 = sectsz=512 sunit=0 blks, lazy-count=1 realtime =none extsz=4096 blocks=0, rtextents=0 data blocks changed from 393216 to 996352 [root@localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/rhel-root 20G 3.7G 17G 19% / devtmpfs 898M 0 898M 0% /dev tmpfs 913M 84K 913M 1% /dev/shm tmpfs 913M 9.1M 904M 1% /run tmpfs 913M 0 913M 0% /sys/fs/cgroup /dev/sda3 1014M 33M 982M 4% /163 /dev/sr0 3.8G 3.8G 0 100% /mnt /dev/md5 2.0G 33M 2.0G 2% /md5 /dev/sda1 797M 165M 633M 21% /boot tmpfs 183M 16K 183M 1% /run/user/42 tmpfs 183M 0 183M 0% /run/user/0 /dev/mapper/libo-X 3.8G 33M 3.8G 1% /lvm
五、LVM缩减逻辑卷
当硬盘空间在某种情况下，如果减少逻辑卷的空间释放给其他逻辑卷使用。我们可以通过lvreduce 缩减或是vgreduce缩减
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[root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert x libo -wi-a----- 3.90g root rhel -wi-ao---- 20.00g swap rhel -wi-ao---- 2.00g [root@localhost ~]# lvreduce -L 2g /dev/libo/x #-L 2g 表示把lvm缩减到2g，不是减少2g WARNING: Reducing active logical volume to 2.00 GiB THIS MAY DESTROY YOUR DATA (filesystem etc.) Do you really want to reduce x? [y/n]: y Size of logical volume libo/x changed from 3.90 GiB (999 extents) to 2.00 GiB (512 extents). Logical volume x successfully resized. [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert x libo -wi-a----- 2.00g root rhel -wi-ao---- 20.00g swap rhel -wi-ao---- 2.00g [root@localhost ~]# vgreduce libo /dev/sdb4
Removed "/dev/sdb4" from volume group "libo" [root@localhost ~]# pvs
PVVG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- 22.00g 4.00m
/dev/sdb1 libo lvm2 a-- 1020.00m 0
/dev/sdb2 libo lvm2 a-- 1020.00m 0
/dev/sdb3 libo lvm2 a-- 1020.00m 1012.00m
/dev/sdb4 lvm2 --- 1.00g 1.00g
六、lvm删除、vg删除、pv删除
在删除lvm前，需要卸载挂载的分区
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[root@localhost ~]# lvremove /dev/libo/x Do you really want to remove active logical volume x? [y/n]: y Logical volume "x" successfully removed [root@localhost ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root rhel -wi-ao---- 20.00g swap rhel -wi-ao---- 2.00g [root@localhost ~]# vgremove libo Volume group "libo" successfully removed [root@localhost ~]# vgs VG #PV #LV #SN Attr VSize VFree rhel 1 2 0 wz--n- 22.00g 4.00m [root@localhost ~]# pvremove /dev/sdb{1..4} Labels on physical volume "/dev/sdb1" successfully wiped Labels on physical volume "/dev/sdb2" successfully wiped Labels on physical volume "/dev/sdb3" successfully wiped Labels on physical volume "/dev/sdb4" successfully wiped [root@localhost ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 rhel lvm2 a-- 22.00g 4.00m [root@localhost ~]#
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