Mount point for RMAN and Data Pump backups

Hi everyone,

   We have 2 node Oracle RAC 10g R2 on RHEL 5 (64 bit).
   Our backup mount point /dev/dm-10 is filling up.
This mount point holds RMAN and Data pump backups.
I would like to add another mount point of 250GB to the node 1 of RAC where currently the backups are running.
I am not sure this mount point (/dev/dm-10) is using Oracle cluster file system (ocfs2) or not?

[oracle@racnode01 ~]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2              19G  6.9G   12G  39% /
/dev/sda3              48G   19G   27G  41% /oracle
/dev/sdc2              48G   21G   25G  46% /opt
/dev/sdc1              19G  180M   18G   1% /tmp