how to resize an lvs file system:
Example: We want to increase LVNAME
1. What vg is it in?
[root@HOSTNAME ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
LVNAME VGGROUP -wi-ao 10.00G
2. There is space on the vg to do this?
[root@HOSTNAME ~]# vgs
VG #PV #LV #SN Attr VSize VFree
VGGROUP 1 8 0 wz–n- 100.00G 10.00G
3. Increase the lv by 10G
lvresize -L +10GB /dev/VGGROUP/LVNAME
or
lvresize -l +100%FREE /dev/VGGROUP/LVNAME
4. resize the file system
resize2fs -p /dev/VGGROUP/LVNAME
This can all be done while the filesystem is mounted safely.