Disks not visible

Hi,
     I am having rhel6 64 bit installed and i want to install oracle 11.2.0.3 64 bit Grid and DB both , but i don't know how to configure scsi device for installing oracle grid. When i am installing Grid infrastructure the disks are not showing and i don't know how to resolve this ? Can anyone help me how to resolve this issue ?
Here are some output:
[root@rhel6@xxxdomain /]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             7.9G  4.3G  3.3G  57% /
tmpfs                 751M  772K  750M   1% /dev/shm
/dev/sda1              15G  7.1G  7.0G  51% /u01
[root@rhel6@xxxdomain /]# fdisk -l
Disk /dev/sda: 26.8 GB, 26843545600 bytes
255 heads, 63 sectors/track, 3263 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: 0x00046c8f
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1959    15728640   83  Linux
/dev/sda2   *        1959        3003     8387584   83  Linux
/dev/sda3            3003        3264     2097152   82  Linux swap / Solaris
Disk /dev/sdb: 16.1 GB, 16106127360 bytes
255 heads, 63 sectors/track, 1958 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: 0xeebb74e6
   Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1               1        1958    15727603+  83  Linux
Thanks & Regards,
Vikash Chauradia

Hi Mahir,
        Thanks for your valuable time i did the same as u mentioned , but still disk is not showing ..
here is the output attached:
[root@rhel6@olamdomain ~]# iscsiadm --mode discoverydb --type sendtargets --portal 10.190.x.150 --discover
Starting iscsid:                                           [  OK  ]
10.190.x.150:3260,1 iqn.2006-01.com.openfiler:tsn.vkcasm
10.190.x.150:3260,1 iqn.2006-01.com.openfiler:tsn.linxfra --> this Target i want to use .
Please Guide me how to do now?
Thanks & Regards,
Vikash Chauradia

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