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linux(centos 6)調整掛載分區大小

linux(centos 6)調整掛載分區大小   安裝centos6使用自動推薦分區,發現一個問題/home 分區過大。   目標:/home分20G,剩下添加給/目錄下   1.查看分區模式 [root@localhost ~]# df -h 文件系統 容量 已用 可用 已用%% 掛載點 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 1.1T 200M 988G 1% /home   2.卸載掛載分區 [root@localhost ~]# umount /home   3.檢查VolGroup-lv_home文件的錯誤性,-f 即使文件系統沒有錯誤跡象,仍強制地檢查正確性。 [root@localhost ~]# e2fsck -f /dev/mapper/VolGroup-lv_home e2fsck 1.41.12 (17-May-2010) 第一步: 檢查inode,塊,和大小 第二步: 檢查目錄結構 第3步: 檢查目錄連接性 Pass 4: Checking reference counts 第5步: 檢查簇概要信息 /dev/mapper/VolGroup-lv_home: 27/69304320 files (0.0% non-contiguous), 4400705/277215232 blocks   4.調整/home為20G, [root@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_home 20G resize2fs 1.41.12 (17-May-2010) Resizing the filesystem on /dev/mapper/VolGroup-lv_home to 5242880 (4k) blocks. Begin pass 2 (max = 32784) 正在重定位塊 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 3 (max = 8460) 正在掃描inode表 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Begin pass 4 (max = 15) 正在更新inode引用 XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX The filesystem on /dev/mapper/VolGroup-lv_home is now 5242880 blocks long.   5.重新掛載並查看 [root@localhost ~]# mount /home [root@localhost ~]# df -h 文件系統 容量 已用 可用 已用%% 掛載點 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home     6.劃分20G外面的剩余空間。使用lvreduce指令用於減少LVM邏輯卷占用的空間大小。可能會刪除邏輯卷上已有的數據,所以在操作前必須進行確認。記得輸入 “y” [root@localhost ~]# lvreduce -L 20G /dev/mapper/VolGroup-lv_home WARNING: Reducing active and open logical volume to 20.00 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 20.00 GiB Logical volume lv_home successfully resized [root@localhost ~]# df -h 文件系統 容量 已用 可用 已用%% 掛載點 /dev/mapper/VolGroup-lv_root 50G 2.9G 44G 7% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home   7.查看“Free PE / Size”剩余空間 [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 1.09 TiB PE Size 4.00 MiB Total PE 285022 Alloc PE / Size 19424 / 75.88 GiB Free PE / Size 265598 / 1.01 TiB VG UUID nSbflh-J7fN-xDvf-zLjL-tFcu-Y5Tm-ybnDk0   8.使用lvextend指令:擴展邏輯卷空間到/dev/mapper/VolGroup-lv_root目錄下,也就是“/”目錄下。   [root@localhost ~]# lvextend -L +1.01T /dev/mapper/VolGroup-lv_root Rounding size to boundary between physical extents: 1.01 TiB Extending logical volume lv_root to 1.06 TiB Logical volume lv_root successfully resized   9.執行操作,使之生效,中間一定要耐心等待。 [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 = 68 Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 284227584 (4k) blocks. The filesystem on /dev/mapper/VolGroup-lv_root is now 284227584 blocks long.   10.查看分區成功 [root@localhost ~]# df -h 文件系統 容量 已用 可用 已用%% 掛載點 /dev/mapper/VolGroup-lv_root 1.1T 2.9G 1011G 1% / tmpfs 5.9G 100K 5.9G 1% /dev/shm /dev/sda1 485M 37M 423M 8% /boot /dev/mapper/VolGroup-lv_home 20G 172M 19G 1% /home 11.重啟 [root@localhost ~]# shutdown -r now  
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