oracle rac 时，ocfs2 仲裁磁盘无法加载

oracle rac 时，有第二个节点的，ocfs2 仲裁磁盘无法加载 
 在第一个节点上，该仲裁磁盘可以正常的加载

  
    

   
     [root@guolinuxorcl1 ocfs2]# mount 
   
     -
   
     t ocfs2 
   
     -
   
     o datavolume,nointr 
   
     /
   
     dev
   
     /
   
     sdb1 
   
     /
   
     u02
   
     /
   
     oradata
   
     /
   
     orcl
[root@guolinuxorcl1 ocfs2]# mount

   
     /
   
     dev
   
     /
   
     mapper
   
     /
   
     VolGroup00
   
     -
   
     LogVol00 on 
   
     /
   
      
   
     type
   
      ext3 (rw)
none on 
   
     /
   
     proc 
   
     type
   
      proc (rw)
none on 
   
     /
   
     sys 
   
     type
   
      sysfs (rw)
none on 
   
     /
   
     dev
   
     /
   
     pts 
   
     type
   
      devpts (rw,gid
   
     =
   
     5
   
     ,mode
   
     =
   
     620
   
     )
usbfs on 
   
     /
   
     proc
   
     /
   
     bus
   
     /
   
     usb 
   
     type
   
      usbfs (rw)

   
     /
   
     dev
   
     /
   
     sda1 on 
   
     /
   
     boot 
   
     type
   
      ext3 (rw)
none on 
   
     /
   
     dev
   
     /
   
     shm 
   
     type
   
      tmpfs (rw)
none on 
   
     /
   
     proc
   
     /
   
     sys
   
     /
   
     fs
   
     /
   
     binfmt_misc 
   
     type
   
      binfmt_misc (rw)
sunrpc on 
   
     /
   
     var
   
     /
   
     lib
   
     /
   
     nfs
   
     /
   
     rpc_pipefs 
   
     type
   
      rpc_pipefs (rw)
configfs on 
   
     /
   
     config 
   
     type
   
      configfs (rw)
ocfs2_dlmfs on 
   
     /
   
     dlm 
   
     type
   
      ocfs2_dlmfs (rw)

   
     /
   
     dev
   
     /
   
     sdb1 on 
   
     /
   
     u02
   
     /
   
     oradata
   
     /
   
     orcl 
   
     type
   
      ocfs2 (rw,_netdev,datavolume,nointr,heartbeat
   
     =
   
     local)
  
    

但是在第二个节点上却无法加载

  
    

   
     [root@guolinuxorcl2 ~]# mounted.ocfs2 
   
     -
   
     d
Device FS UUID Label

   
     /
   
     dev
   
     /
   
     sdb1 ocfs2 004883a4
   
     -
   
     f8b7
   
     -
   
     41be
   
     -
   
     b8b3
   
     -
   
     7954d02bfc64 oracrsfiles
[root@guolinuxorcl2 ~]# mounted.ocfs2 
   
     -
   
     f
Device FS Nodes

   
     /
   
     dev
   
     /
   
     sdb1 ocfs2 Unknown: Bad magic number 
   
     in
   
      inode 
  
    

每次加载都报错

ocfs2_hb_ctl: Bad magic number in inode while reading uuid mount.ocfs2: Error when attempting to run /sbin/ocfs2_hb_ctl: "Operation not permitted"

解决办法如下

1、先重已加载的节点卸载掉该硬盘。

2、在无法加载的节点格式化该盘。

 记住用dd格式化，而不是fdisk，如果只是用fdisk删除分区和格式化，第二个节点上始终记录这个盘处于 bad magic状态

可以看到dd以后，sdb1 在ocfs2 的状态立刻改变了，但如果是只是fdisk 掉 sdb1,状态是不会变的，先dd，然后用fdisk重新分区。

  
    

   
     [root@guolinuxorcl2 ~]# dd 
   
     if
   
     =/
   
     dev
   
     /
   
     zero 
   
     of
   
     =/
   
     dev
   
     /
   
     sdb1 bs
   
     =
   
     8192
   
      count
   
     =
   
     2560
   
     

   
     2560
   
     +
   
     0
   
      records 
   
     in
   
     

   
     2560
   
     +
   
     0
   
      records 
   
     out
   
     
[root@guolinuxorcl2 ~]# mounted.ocfs2 
   
     -
   
     d
Device FS UUID Label
[root@guolinuxorcl2 ~]# fdisk 
   
     /
   
     dev
   
     /
   
     sdb

Command (m 
   
     for
   
      help): d
Selected partition 
   
     1
   
     

Command (m 
   
     for
   
      help): 
   
     1
   
     

   
     1
   
     : unknown command
Command action
 a toggle a bootable flag
 b edit bsd disklabel
 c toggle the dos compatibility flag
 d 
   
     delete
   
      a partition
 l list known partition types
 m print this menu
 n add a new partition
 o create a new empty DOS partition table
 p print the partition table
 q quit without saving changes
 s create a new empty Sun disklabel
 t change a partition
   
     '
   
     s system id
   
     

   
      u change display
   
     /
   
     entry units
 v verify the partition table
 w 
   
     write
   
      table 
   
     to
   
      disk 
   
     and
   
      exit
 x extra functionality (experts only)

Command (m 
   
     for
   
      help): d
No partition 
   
     is
   
      defined yet!

Command (m 
   
     for
   
      help): w 
The partition table has been altered!

Calling ioctl() 
   
     to
   
      re
   
     -
   
     read
   
      partition table.

WARNING: Re
   
     -
   
     reading the partition table failed 
   
     with
   
      error 
   
     16
   
     : Device 
   
     or
   
      resource busy.
The kernel still 
   
     uses
   
      the old table.
The new table will be used at the next reboot.
Syncing disks.
  
    

3、在节点二上对该硬盘mount。

4、在节点一上对该硬盘mount。

总结：如果仲裁盘是新安装的系统，可以用该方法试着解决该错误。把仲裁盘dd格式化，然后重新加载。