Expand Lv-root Space Steps in CentOS

View server Discovery vg_host01-The space occupied by Lv_root is more and need to be enlarged. The following two options are available:1Expand the size of the lv_root using spare disks (recommended)2Move the lv_home space out of the way to Lv_root (which is eventually used due to limited hardware conditions) to move lv_home space out part of the process to Lv_root1, view partition copy code code example: Filesystem 1K-blocks used Available use%mounted on/dev/mapper/vg_host01-Lv_root51606140    755572  48229128   2% /Tmpfs8164776         0   8164776   0%/dev/SHM/dev/sda1495844     31571    438673   7% /Boot/dev/mapper/vg_host01-Lv_home217446348    191700 206208968   1% /Home2UninstallHome Copy Code code example: Umount/Home3, check the copy code code example for a logical volume: E2fsck-f/dev/mapper/vg_host01-Lv_home4, adjust the/dev/mapper/vg_host01-the parameter after the Lv_home size is the copy code code example of the Lv_home modified size: RESIZE2FS-p/dev/mapper/vg_host01-lv_home 50G5, adjust the/dev/mapper/vg_host01-in LVMlv_home Size Copy Code code example: Lvreduce-L 50g/dev/mapper/vg_host01-Lv_home and re-mount the home under Mount/dev/mapper/vg_host01-lv_home/Home6, view free space Copy code example: Vgdisplay|grep"Free PE"7, use the Lvextend directive to extend the logical volume space to/dev/mapper/vg_host01-Example of copy code code in Lv_root directory: Lvextend-L +150g/dev/mapper/vg_host01-Lv_root8, Reassign/dev/mapper/vg_host01-lv_root Space Size Copy Code code example: RESIZE2FS-p/dev/mapper/vg_host01-Lv_root9, see structure Copy code code example: Dffilesystem 1K-blocks used Available use%mounted on/dev/mapper/vg_host01-Lv_root206424760    767888 195173032   1% /Tmpfs8164776         0   8164776   0%/dev/SHM/dev/sda1495844     31571    438673   7% /Boot/dev/mapper/vg_host01-Lv_home51606140    184144  48800560   1% /Home notes: Uninstalled during the operation/home, inadvertently be someone else reboot, restart the process can not normally enter the CentOS reason:/etc/fstab before the home/home has been hung to the/dev/mapper/vg_host01-lv_home, reboot will be the content of/etc/fstab to detect each, not detected/Home Workaround:/etc/fstab about/dev/mapper/vg_host01-lv_home in this line, the save will find a read-only file, the system is not allowed to save, at this time using Mount-o remount, RW/can read/write the files in the directory to modify, After you save the restart, you can continue to expand the space.

Expand Lv-root Space Steps in CentOS