Linux Logical Volume management tuning partition size Example

Test machine A variety of errors, create a directory are error, DF looked, found Volgroup-lv_root 100%, virtual Disk full, how to do?

1, the settlement process

# Df-h//view partitions
# Umount/home//Cancellation mount
# e2fsck-f/dev/mapper/volgroup-lv_home//Zoning detection
# resize2fs-p/dev/mapper/volgroup-lv_home 100G//Set Lv_home virtual partition to 100G
# Mount/home//Mount Home
# Df-h//view partitions
# lvreduce-l 100g/dev/mapper/volgroup-lv_home/Free space
# Vgdisplay//View free space size
# Lvextend-l +311.47g/dev/mapper/volgroup-lv_root//Extended Lv_root virtual partitions
# resize2fs-p/dev/mapper/volgroup-lv_root//lv_root Reset partition size

LVM (Logical Disk Management) with high flexibility.

2, the detailed resolution process

[Root@localhost ~]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/volgroup-lv_root 50G 47G 16M 100%///lv_root full
Tmpfs 1.9G 72K 1.9G 1%/DEV/SHM
/DEV/SDA1 485M 40M 420M 9%/boot
/dev/mapper/volgroup-lv_home 406G 19G 366G 5%/home//lv_home lots of space

[Root@localhost ~]# resize2fs-p/dev/mapper/volgroup-lv_home 100G
RESIZE2FS 1.41.12 (17-may-2010)
FileSystem at/dev/mapper/volgroup-lv_home is mounted on/home; On-line resizing required
On-line shrinking from 107865088 to 65536000 not supported. First Umount to RESIZE2FS.

[Root@localhost ~]# umount/home//umount Home Directory

[Root@localhost ~]# resize2fs-p/dev/mapper/volgroup-lv_home 100G
RESIZE2FS 1.41.12 (17-may-2010)
Please run ' e2fsck-f/dev/mapper/volgroup-lv_home ' first. Prompt for disk detection first

[Root@localhost ~]# e2fsck-f/dev/mapper/volgroup-lv_home
E2fsck 1.41.12 (17-may-2010)

First step: Check Inode, block, and size
Step Two: Check the directory structure

Step 3rd: Check directory Connectivity

Pass 4:checking Reference counts

5th step: Check the cluster summary information

/dev/mapper/volgroup-lv_home:1459/16384000 files (4.0% non-contiguous), 5914204/65536000 blocks

[Root@localhost ~]# resize2fs-p/dev/mapper/volgroup-lv_home 100G//Resize
RESIZE2FS 1.41.12 (17-may-2010)
Resizing the filesystem on/dev/mapper/volgroup-lv_home to 26214400 (4k) blocks.
Begin Pass 2 (max = 32768)
Relocating Block xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Begin Pass 3 (max = 2000)
Scanning Inode Table Xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
The filesystem on/dev/mapper/volgroup-lv_home is now 26214400 blocks long.

[Root@localhost ~]# mount/home/

[Root@localhost ~]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/volgroup-lv_root 50G 47G 16M 100%/
Tmpfs 1.9G 72K 1.9G 1%/DEV/SHM
/DEV/SDA1 485M 40M 420M 9%/boot
/dev/mapper/volgroup-lv_home 99G 19G 75G 20%/home

[Root@localhost ~]# lvreduce-l 100g/dev/mapper/volgroup-lv_home//Free space
Warning:reducing Active and open Logical volume to 100.00 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 100.00 GiB
Logical Volume Lv_home successfully resized

[Root@localhost ~]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/volgroup-lv_root 50G 47G 16M 100%/
Tmpfs 1.9G 72K 1.9G 1%/DEV/SHM
/DEV/SDA1 485M 40M 420M 9%/boot
/dev/mapper/volgroup-lv_home 99G 19G 75G 20%/home

[Root@localhost ~]# Vgdisplay
---Volume Group---
VG Name Volgroup
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 465.27 GiB
PE Size 4.00 MiB
Total PE 119109
Alloc pe/size 39372/153.80 GiB
Free pe/size 79737/311.47 GiB//Idle Space
VG UUID Vt2v4t-byxs-tqqk-cy0h-ide3-pabx-lufkrs

[Root@localhost ~]# lvextend-l +311.47g/dev/mapper/volgroup-lv_root//Free space added to Lv_root
Rounding size to boundary between physical extents:311.47 GiB
Extending logical Volume Lv_root to 361.47 GiB
Logical Volume Lv_root successfully resized

[Root@localhost ~]# resize2fs-p/dev/mapper/volgroup-lv_root
RESIZE2FS 1.41.12 (17-may-2010)
FileSystem at/dev/mapper/volgroup-lv_root is mounted on/; On-line resizing required
Old desc_blocks = 4, new_desc_blocks = 23//Here be patient, enlarge, longer
Performing a on-line resize of/dev/mapper/volgroup-lv_root to 94757888 (4k) blocks.
The filesystem on/dev/mapper/volgroup-lv_root is now 94757888 blocks long.

[Root@localhost openfire]# Df-h
FileSystem Size Used Avail use% mounted on
/dev/mapper/volgroup-lv_root 356G 48G 308G 14%/
Tmpfs 1.9G 72K 1.9G 1%/DEV/SHM
/DEV/SDA1 485M 40M 420M 9%/boot
/dev/mapper/volgroup-lv_home 99G 19G 75G 20%/home