建立物理卷报错Can't open /dev/sdb5 exclusively. Mounted filesystem的问题解决过程记录

yum服务器lvm扩容，data目录是yum存放rpm包的目录，只有20G，须要添加磁盘扩容到80G # df -lh Filesystem                 Size  Used Avail Use% Mounted on /dev/mapper/vg_node5-root   20G  479M   18G   3% / tmpfs                      935M     0  935M   0% /dev/shm /dev/sda1                  485M   39M  421M   9% /boot /dev/mapper/vg_node5-data   20G  172M   19G   1% /data /dev/mapper/vg_node5-usr   9.7G  1.6G  7.6G  18% /usr /dev/mapper/vg_node5-web    15G  165M   14G   2% /web 1.添加一块硬盘 2.对硬盘分区，并将格式调整为8e即linux lvm格式 #挂载系统分区 # kpartx -l /dev/sdb # kpartx -af /dev/sdb # partx -a /dev/sdb 3.建立物理卷 在将几块盘作LVM时，遇到一个以前都没遇到过的问题: # pvcreate /dev/sdb5   Can't open /dev/sdb5 exclusively.  Mounted filesystem? 首先第一反应就是查看这个分区是否已经在使用了，可是没有。 查看硬盘的一些信息: # cat /proc/partitions major minor  #blocks  name    8        0   83886080 sda    8        1     512000 sda1    8        2   83373056 sda2    8       16  125829120 sdb    8       17          1 sdb1    8       21  125796982 sdb5  253        0   20480000 dm-0  253        1    4096000 dm-1  253        2   15360000 dm-2  253        3   20480000 dm-3  253        4   10240000 dm-4  253        5          1 dm-5  253        6  125796982 dm-6 # fdisk /dev/sdb -l Disk /dev/sdb: 128.8 GB, 128849018880 bytes 255 heads, 63 sectors/track, 15665 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x44c662ff    Device Boot      Start         End      Blocks   Id  System /dev/sdb1               1       15665   125829081    5  Extended /dev/sdb5               5       15665   125796982+  8e  Linux LVM 接着看一些底层的信息: dmsetup 是一个底层的逻辑卷管理， dm 应该是 Device Mapper的简称。 [root@node5 /]# dmsetup status sdb1: 0 2 linear  vg_node5-web: 0 30720000 linear  sdb5: 0 251593965 linear  vg_node5-usr: 0 20480000 linear  vg_node5-swap: 0 8192000 linear  vg_node5-root: 0 40960000 linear  vg_node5-data: 0 40960000 linear  [root@node5 /]# dmsetup ls sdb1 (253:5) vg_node5-web (253:2) sdb5 (253:6) vg_node5-usr (253:4) vg_node5-swap (253:1) vg_node5-root (253:0) vg_node5-data (253:3) 例如： root@ubuntu:~# dmsetup ls 35000c50026716847       (254, 2) vg_data-lv_home (254, 0) 35000c5002670f03e       (254, 3) 35000c5002670f03e-part1 (254, 5) 35000c50026716847-part1 (254, 4) vg_data-lv_swap (254, 1) 能够看到 35000c5002670f03e 和 35000c50026716847 组成了multipath(多路径) # ll /dev/mapper/ total 0 crw-rw---- 1 root root 10, 58 Jul 26 19:51 control lrwxrwxrwx 1 root root      7 Jul 26 19:59 vg_node5-data -> ../dm-3 lrwxrwxrwx 1 root root      7 Jul 26 19:59 /dev/sdb1 -> ../dm-5 lrwxrwxrwx 1 root root      7 Jul 26 19:59 /dev/sdb5 -> ../dm-6 lrwxrwxrwx 1 root root      7 Jul 26 19:59 vg_node5-root -> ../dm-0 lrwxrwxrwx 1 root root      7 Jul 26 19:59 vg_node5-swap -> ../dm-1 lrwxrwxrwx 1 root root      7 Jul 26 19:59 vg_node5-usr -> ../dm-4 lrwxrwxrwx 1 root root      7 Jul 26 19:59 vg_node5-web -> ../dm-2 使用 dmsetup remove xxx 移除掉就能够建立PV了: # dmsetup remove /dev/sdb1 # dmsetup remove /dev/sdb5 从新建立物理卷成功 root@ubuntu:~# pvcreate /dev/sdb5   Physical volume "/dev/sdb5" successfully created 也能够使用dmsetup remove_all移除全部。 # vgdisplay    --- Volume group ---   VG Name               vg_node5   System ID                Format                lvm2   Metadata Areas        1   Metadata Sequence No  6   VG Access             read/write   VG Status             resizable   MAX LV                0   Cur LV                5   Open LV               5   Max PV                0   Cur PV                1   Act PV                1   VG Size               79.51 GiB   PE Size               4.00 MiB   Total PE              20354   Alloc PE / Size       17250 / 67.38 GiB   Free  PE / Size       3104 / 12.12 GiB   VG UUID               tNuKXc-UdQO-Z8BK-ZtOQ-W93k-pqui-HAxKja 4.对物理卷vg_node5进行扩容 # vgextend vg_node5 /dev/sdb5   Volume group "vg_node5" successfully extended [root@node5 ~]# vgs   VG       #PV #LV #SN Attr   VSize   VFree     vg_node5   2   5   0 wz--n- 199.47g 132.09g 将逻辑卷vg_node5-data即/data分区扩容到80G [root@node5 ~]# lvextend -L 80G /dev/mapper/vg_node5-data    Extending logical volume data to 80.00 GiB   Logical volume data successfully resized 从新读取大小 [root@node5 ~]# resize2fs /dev/mapper/vg_node5-data  resize2fs 1.41.12 (17-May-2010) Filesystem at /dev/mapper/vg_node5-data is mounted on /data; on-line resizing required old desc_blocks = 2, new_desc_blocks = 5 Performing an on-line resize of /dev/mapper/vg_node5-data to 20971520 (4k) blocks. The filesystem on /dev/mapper/vg_node5-data is now 20971520 blocks long. [root@node5 ~]# df -lh Filesystem                 Size  Used Avail Use% Mounted on /dev/mapper/vg_node5-root   20G  479M   18G   3% / tmpfs                      935M     0  935M   0% /dev/shm /dev/sda1                  485M   39M  421M   9% /boot /dev/mapper/vg_node5-data   79G  184M   75G   1% /data /dev/mapper/vg_node5-usr   9.7G  1.6G  7.6G  18% /usr /dev/mapper/vg_node5-web    15G  165M   14G   2% /web