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i have 2 partition on cenos 6.4 in SOFT RAID 1.

my current mounted partitions(df -h):

Filesystem            Size  Used Avail Use% Mountedon
/dev/md1               20G  5.4G   14G  29% /
/dev/md2              897G  680M  851G   1% /home

How to mount /backup in /dev/md2 ? or

How to create new mount point for /backup?

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2  
What's backup? Is it another partition? Partitions are mounted at directories, not the other way around. Please edit your question to clarify what you are trying to do. Are you trying to create a new partition in /dev/md2 and mount that as backup? – terdon Oct 7 '13 at 15:02
    
What you could also do is backup /home's content, remove/shrink the partition and create new ones as needed. – mveroone Oct 7 '13 at 15:24
up vote 1 down vote accepted

Another solution is to make a Bind mount, which will "link" the two directories together.

Extract from mount man page :

 Since Linux 2.4.0 it is possible to remount part of the file  hierarchy
 somewhere else. The call is
      mount --bind olddir newdir
 After this call the same contents is accessible in two places.

So do something like :

mount --bind /home/backup/ /backup/

All you have to do next is to make this permanent by adding the corresponding line to /etc/fstab

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i'll take syn backup /home to /backup. any problem? – nkteam Oct 7 '13 at 15:28
    
Then you'll have /home subdirectories in /backup also =) – mveroone Oct 8 '13 at 7:17

You may just want a symlink:

  1. Make a directory /home/backup
  2. Make a symlink from /backup to /home/backup, i.e. ln -s /home/backup/ /backup

Now you can move files to/from /backup and they will get stored on /dev/md2

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