Hi ssuvasanth,
It's easy to identify the device file(/dev/sdX) and VMware virtual hard disk.
right click your virtual machine on the vCenter ( or vSphere Client), and click "Edit Settings".
You will see your virtual hard disk as above.
On the right pane, SCSI address shows up like "SCSI(0:0)". The number of the SCSI(X:X) can map to Linux device file such as;
SCSI(0:0) -> /dev/sda
SCSI(0:1) -> /dev/sdb
・
・
・
So I guess /dev/sdj, which you wish to delete, SCSI(0:10). Note that the virtual hard disk name "Hard disk X" is not necessarily corresponding to /dev/sdX.
This mapping is based on Linux device naming mechanism, thus if you customize this configuration, say using /etc/udev.rules, you should check Red Hat document before you delete your vdisk.
Best,
MAC
Hello,
The best way to do it a mix of the above and the following:
Run the command "lssci". A sample output is provided below:
Next follow the above suggestion from macvirtual to find out the mapping of the disks with the VMDK. Now you are sure and safe to know which is which.
Hope this helps 
now match second and third number from first column sd '2:0:1:0' with VMWARE scsi Id mentioned in VM properties as mentioned in above screen shot.
sorry to say that: but that is not correct. The second number is always 0 here.
And there is no relation between the first number and the number of the SCSI Controller in VM Propierties. (though it is very often the same, but you cannot rely on that)
So after years: this question is still open to be answered 
