Adjust the space size of the directory under Linux __linux

I. Purpose

When using the CentOS6.5 version Linux system, found that the root directory (/) of the space is not sufficient, and other directory space has a lot of free, so this article is mainly for the existing space to adjust. First, let's look at the space allocation of the system: [Root@innoplay01 ~]# lsb_release-a
LSB Version:: base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64: Graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor Id:centos
Description:centos Release 6.5 (Final)
release:6.5

Codename:final

[Root@innoplay01 java]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/vg_innoplay01-lv_root 50G 2.0G 45G 5%/
Tmpfs 3.9G 0 3.9G 0%/dev/shm
/DEV/SDA1 485M 40M 421M 9%/boot
/dev/mapper/vg_innoplay01-lv_home 860G 200M 816G 1%/home

The following detailed steps section will remove 661G of space from the/dev/mapper/vg_innoplay01-lv_home partition and add it to the/dev/mapper/vg_innoplay01-lv_root partition.

Uninstall the/dev/mapper/vg_innoplay01-lv_home partition:


[Root@innoplay01 java]# Umount/home


At this point in the DF command to see that the/home directory has been seen, as follows:


[Root@innoplay01 java]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/vg_innoplay01-lv_root 50G 2.0G 45G 5%/
Tmpfs 3.9G 0 3.9G 0%/dev/shm
/DEV/SDA1 485M 40M 421M 9%/boot



To reset the/dev/mapper/vg_innoplay01-lv_home size:


Resize2fs-p/dev/mapper/vg_innoplay01-lv_home 210G

[Root@innoplay01 java]# resize2fs-p/dev/mapper/vg_innoplay01-lv_home 210G
RESIZE2FS 1.41.12 (17-may-2010)
Please run ' e2fsck-f/dev/mapper/vg_innoplay01-lv_home '.

Follow the prompts:

E2fsck-f/dev/mapper/vg_innoplay01-lv_home

[Root@innoplay01 java]# e2fsck-f/dev/mapper/vg_innoplay01-lv_home
E2fsck 1.41.12 (17-may-2010)
Pass 1:checking inodes, blocks, and sizes
Pass 2:checking directory structure
Pass 3:checking Directory Connectivity
Pass 4:checking Reference counts
Pass 5:checking Group summary information
/dev/mapper/vg_innoplay01-lv_home:11/57237504 files (0.0% non-contiguous), 3643567/228918272 blocks
[Root@innoplay01 java]# resize2fs-p/dev/mapper/vg_innoplay01-lv_home 210G
RESIZE2FS 1.41.12 (17-may-2010)
Resizing the filesystem on/dev/mapper/vg_innoplay01-lv_home to 55050240 (4k) blocks.
Begin Pass 2 (max = 32768)
Relocating blocks Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Begin Pass 3 (max = 6987)
Scanning Inode Table Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The filesystem on/dev/mapper/vg_innoplay01-lv_home is now 55050240 blocks long.






Check for success:


[Root@innoplay01 java]# Mount/home
[Root@innoplay01 java]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/vg_innoplay01-lv_root 50G 2.0G 45G 5%/
Tmpfs 3.9G 0 3.9G 0%/dev/shm
/DEV/SDA1 485M 40M 421M 9%/boot
/dev/mapper/vg_innoplay01-lv_home 207G 188M 197G 1%/home

To reduce the/dev/mapper/vg_innoplay01-lv_home logical partition to a specified size:

Lvreduce-l 210g/dev/mapper/vg_innoplay01-lv_home

[Root@innoplay01 java]# lvreduce-l 210g/dev/mapper/vg_innoplay01-lv_home
Warning:reducing Active and open logical volume to 210.00 GiB
This May DESTROY YOUR DATA (filesystem etc.)
Do your really want to reduce lv_home? [y/n]: Y
Reducing logical volume Lv_home to 210.00 GiB
Logical Volume Lv_home successfully resized

To query the volume Group for information:
Vgdisplay

[Root@innoplay01 java]# Vgdisplay
---Volume Group---
VG Name Vg_innoplay01
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
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 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc pe/size 68548/267.77 GiB
Free Pe/size 169793/663.25 GiB
VG UUID Symjnp-igwm-mkt1-ubum-rsx8-hviz-eztuer

The free pe/size designation should be now available in the allocated space.

Increase the size of the/dev/mapper/vg_innoplay01-lv_root partition:

Lvextend-l +661.00g/dev/mapper/vg_innoplay01-lv_root

[Root@innoplay01 java]# lvextend-l +661.00g/dev/mapper/vg_innoplay01-lv_root
Extending logical Volume Lv_root to 711.00 GiB
Logical Volume Lv_root successfully resized


To reset the size of the partition:
Resize2fs-p/dev/mapper/vg_innoplay01-lv_root

[Root@innoplay01 java]# resize2fs-p/dev/mapper/vg_innoplay01-lv_root
RESIZE2FS 1.41.12 (17-may-2010)
FileSystem at/dev/mapper/vg_innoplay01-lv_root is mounted on/; On-line resizing required
Old desc_blocks = New_desc_blocks = 45
Performing a on-line resize of/dev/mapper/vg_innoplay01-lv_root to 186384384 (4k) blocks.
The filesystem on/dev/mapper/vg_innoplay01-lv_root is now 186384384 blocks long.


To view the partition size again:
[Root@innoplay01 java]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/vg_innoplay01-lv_root 700G 2.0G 663G 1%/
Tmpfs 3.9G 0 3.9G 0%/dev/shm
/DEV/SDA1 485M 40M 421M 9%/boot
/dev/mapper/vg_innoplay01-lv_home 207G 188M 197G 1%/home

Note the point:

1, uninstall the/home directory when the failure, you can first execute the following Fuser command, and then Umount can be: fuser-m/home;

2, set the size of the lv_home, again mount the partition, found with DF command can not see to the partition, at this time as long as the mount once;

3, in setting the size of lv_root, do not put free pe/size space all use, this is likely to appear free PE space shortage, it is recommended to retain a little free PE space.