21，lvm 在线扩容

LVM在线扩容：
[root@centos7 ~]# df -h
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   9.3G  1.1G  8.3G  12% /
devtmpfs                  982M     0  982M   0% /dev
tmpfs                     993M     0  993M   0% /dev/shm
tmpfs                     993M  8.6M  984M   1% /run
tmpfs                     993M     0  993M   0% /sys/fs/cgroup
/dev/sda1                 197M  103M   95M  53% /boot
tmpfs                     199M     0  199M   0% /run/user/0
/dev/mapper/vg1_demo-lv1   27M  779K   24M   4% /app
[root@centos7 ~]# dd if=/dev/zero of=/app/aa.txt bs=1M count=23
23+0 records in
23+0 records out
24117248 bytes (24 MB) copied, 0.0563617 s, 428 MB/s
[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# df -h
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   9.3G  1.1G  8.3G  12% /
devtmpfs                  982M     0  982M   0% /dev
tmpfs                     993M     0  993M   0% /dev/shm
tmpfs                     993M  8.6M  984M   1% /run
tmpfs                     993M     0  993M   0% /sys/fs/cgroup
/dev/sda1                 197M  103M   95M  53% /boot
tmpfs                     199M     0  199M   0% /run/user/0
/dev/mapper/vg1_demo-lv1   27M   24M 1007K  97% /app
[root@centos7 ~]# 


扩容前先看下是否有剩余的空间：
[root@centos7 ~]# vgs
  VG       #PV #LV #SN Attr   VSize   VFree  
  centos     1   2   0 wz--n-   9.80g      0 
  vg1_demo   2   1   0 wz--n- 544.00m 460.00m
[root@centos7 ~]# 



lv扩容40M
[root@centos7 ~]# lvextend -L +40M /dev/mapper/vg1_demo-lv1

lv扩容到40M
[root@centos7 ~]# lvextend -L 40M /dev/mapper/vg1_demo-lv1

[root@centos7 ~]# lvs
  LV   VG       Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root centos   -wi-ao----   9.30g                                                    
  swap centos   -wi-ao---- 512.00m                                                    
  lv1  vg1_demo -wi-ao----  72.00m                                                    
[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# lvextend -L +10M /dev/mapper/vg1_demo-lv1
  Rounding size to boundary between physical extents: 12.00 MiB.
  Size of logical volume vg1_demo/lv1 changed from 72.00 MiB (18 extents) to 84.00 MiB (21 extents).
  Logical volume vg1_demo/lv1 successfully resized.
[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# lvs
  LV   VG       Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root centos   -wi-ao----   9.30g                                                    
  swap centos   -wi-ao---- 512.00m                                                    
  lv1  vg1_demo -wi-ao----  84.00m                                                    
[root@centos7 ~]# 


扩容后需要对扩容的部分LV,在线格式化
[root@centos7 ~]# df -h
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   9.3G  1.1G  8.3G  12% /
devtmpfs                  982M     0  982M   0% /dev
tmpfs                     993M     0  993M   0% /dev/shm
tmpfs                     993M  8.6M  984M   1% /run
tmpfs                     993M     0  993M   0% /sys/fs/cgroup
/dev/sda1                 197M  103M   95M  53% /boot
tmpfs                     199M     0  199M   0% /run/user/0
/dev/mapper/vg1_demo-lv1   27M   24M 1007K  97% /app
[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# resize2fs /dev/mapper/vg1_demo-lv1  注：如果是xfs 文件系统就用：xfs_growfs /dev/mapper/vg1_demo-lv1
resize2fs 1.42.9 (28-Dec-2013)
Filesystem at /dev/mapper/vg1_demo-lv1 is mounted on /app; on-line resizing required
old_desc_blocks = 1, new_desc_blocks = 1
The filesystem on /dev/mapper/vg1_demo-lv1 is now 86016 blocks long.

[root@centos7 ~]# 
[root@centos7 ~]# 
[root@centos7 ~]# df -h
Filesystem                Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   9.3G  1.1G  8.3G  12% /
devtmpfs                  982M     0  982M   0% /dev
tmpfs                     993M     0  993M   0% /dev/shm
tmpfs                     993M  8.6M  984M   1% /run
tmpfs                     993M     0  993M   0% /sys/fs/cgroup
/dev/sda1                 197M  103M   95M  53% /boot
tmpfs                     199M     0  199M   0% /run/user/0
/dev/mapper/vg1_demo-lv1   78M   25M   49M  34% /app
[root@centos7 ~]#