一、查看目錄掛載路徑：
1、最簡單的，直接 df -h 目錄名
可以看到，ESB在rhel-root分區下
2、fdisk -l查看分區掛載情況
二、調整目錄空間大小（這塊是轉的，爲了方便和第一部分整合到一塊）
在使用CentOS6.5版本linux系統的時候，發現根目錄(/)的空間不是很充足，而其他目錄空間有很大的空閒，所以本文主要是針對現在已有的空間進行調整。首先，先來查看一下系統的空間分配情況：
[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
下面的詳細步驟部分將從/dev/mapper/vg_innoplay01-lv_home 分區下取出661G的空間添加到/dev/mapper/vg_innoplay01-lv_root 分區上去。
卸載/dev/mapper/vg_innoplay01-lv_home分區:
[root@innoplay01 java]# umount /home
此時在用df命令查看將會發現/home目錄已經看不見了，如下所示：
[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
從新設定/dev/mapper/vg_innoplay01-lv_home的大小:
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' first.
依照提示執行：
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.
檢查是否成功：
[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
將/dev/mapper/vg_innoplay01-lv_home邏輯分區減小到指定大小：
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 you really want to reduce lv_home? [y/n]: y
Reducing logical volume lv_home to 210.00 GiB
Logical volume lv_home successfully resized
查詢卷組的信息：
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
Free PE / Size指定的應該是現在可在分配的空間。
增加/dev/mapper/vg_innoplay01-lv_root分區的大小:
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
從新設定該分區的大小：
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 = 18, new_desc_blocks = 45
Performing an 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.
再次查看分區大小:
[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
注意點：
1、在卸載/home目錄的時候失敗，可先執行如下fuser命令，然後再umount即可：fuser -m /home ；
2、設定完lv_home的大小，再次mount該分區時，發現用df命令無法看到給分區，此時只要在mount一次即可；
3、在設定lv_root的大小時，不要把Free PE / Size的空間全部都用上，這很可能會出現Free PE空間不足的現象，建議保留一點Free PE的空間。